1 . Fo r n o r m al i n c i d e n c e of a wave o n d i e l e c tr i c - c o n d u c t or i nt e r f a c e t h e m ag n i t u d e o f r e fl e c ti o n c o e ffi c i e nt i s
( a) I n fi n i ty ( b ) I n b e twe e n 0 a n d 1 ( c ) Z e ro ( d ) U n i ty
2 . T h e r an g e o f r e fl e c t i on c o e ffi c i e nt i s
( a) - 1 t o 1 ( b ) - i n fi n i ty t o + i n fi n i ty ( c ) 0 t o i n fi n i ty ( d ) 0 t o 1
3 . W h e n i n c i d e nt an g l e i s B re w s t e r a n gl e t h e n
( a) N o r e fl e c t i o n t ake s p l ac e ( b ) Pa rt i a l t r an s m i s s i on on l y ta ke s p l a c e ( c ) C o m p l e t e r e fl e c ti o n t a ke s p l a c e ( d ) Pa rt i a l r e fl e c t i o n o n l y t ake s p l ac e
4 . T h e p o i nt i n g ve c t or gi ve s
( a) T h e d i r e c t i on of E fi e l d ( b ) T h e d i r e c t i on of wave p r o p ag at i o n ( c ) T h e d i r e c t i on of b o th E a n d H fi e l d s ( d ) T h e d i r e c t i on of H fi e l d
5 . T h e m ag n e t i c fi e l d a t t h e s u r f a c e o f a g o o d c on d u c to r i s 2 A /m . T h e f r e q u e n c y of t h e fi e l d i s 6 00 M H z . T h e s u rf ac e r m s c u rr e nt d e n s i ty i s
( a) 2 A / m 2 ( b ) 1 /2 A / m ( c ) 2 A / m ( d ) 1 /2 A / m 2
6 . T h e wave a l on g a c o- ax i al t ra n s m i s s i on l i n e i s an e x am p l e f o r
( a) L i ght wave ( b ) G u i d e d wave ( c ) U n i f o r m p l a ne wave ( d ) U n g u i d e d wave
7 . T h e e q u i p h as e s u r f a c e s p r og r e s s e s a l on g t h e g u i d e w i t h a ve l o c i ty ( a) ω / ss ( b ) ss / ω ( c ) d ω / d ss ( d ) L i ght ve l o c i ty
8 . T h e ve l o c i ty o f p r o p ag a ti o n o f e qu i p h a s e s u r f a c e s a l o n g th e g u i d e i s
( a) P h a s e ve l o c i ty ( b ) G u i d e ve l o c i ty ( c ) G r o u p ve l o c i ty ( d ) L i ght ve l o c i ty
9 . T E M m o d e i s e q u al t o
( a) T M 1 0 ( b ) T E 0 0 ( c ) T M 0 0 ( d ) T E 1 0
1 0. T h e wave i m p e d an c e ove r t h e c r os s s e c ti o n o f th e gu i d e i s
( a) D e c r e a s e s w i t h f r e q u e n c y ( b ) I n c r e a s e s w i t h f re qu e n c y ( c ) I n c r e a s e s e x p o n e nti a l l y ( d ) C o n s t ant
1 1. I n a c oa x i al t ra n s m i s s i on l i n e e l e c tr i c an d m ag n e t i c fi e l d s a re
( a) C o n fi n e d t o a d i e l e c tr i c m e d i u m ( b ) C o n fi n e d t o t h e i n n e r c on d u c to r ( c ) N o t C o n fi n e d t o d i e l e c t r i c me d i u m ( d ) C o n fi n e d t o t h e o u t e r c o n d u c t or
1 2. I n a tr a n s m i s s i o n l i n e t h e vol t a ge a n d c u r r e nt s t an d i n g wave s a re
( a) 9 0 0 o u t of p h a s e a l on g t h e l i n e ( b ) 0 0 o u t of p h a s e a l on g t h e l i n e ( c ) 1 80 0 o u t of p h a s e a l on g t h e l i n e ( d ) 2 70 0 o u t of p h a s e a l on g t h e l i n e
1 3. Fo r a l ow l o s s l i n e t h e p h a s e ve l o c i ty i s
( a) I n c r e a s e s w i t h s qu a r e o f f re qu e n c y ( b ) A p p r ox i m a te ly c on s ta nt ( c ) I n c r e a s e s w i t h f re qu e n c y ( d ) D e c r e a s e s w i t h f r e q u e n c y
1 4. A l u m p e d l o ad e d l i n e s b e h ave s as a ( a) B a n d r e j e c t fi l t e r ( b ) B a n d p a s s fi l t e r ( c ) H i g h p a s s fi l t e r ( d ) L ow p as s fi l t e r
1 5. O n e n e p e r i s e qu a l t o
( a) 8 . 86 d B ( b ) 1 0 d B ( c ) 6 . 86 d B ( d ) 8 . 68 d B
1 6. t h e r e fl e c t io n c o e ffi c i e nt f o r a s h o rt c i r c u i t e d t r an s m i s s i on l i n e i s ( a) I n fi n i ty ( b ) - 1 ( c ) Z e ro ( d ) + 1
1 7. A λ / 4 l i n e m ay b e c on s i d e re d a s
( a) Vo l t ag e i nve r t e r ( b ) Powe r i nve r t e r ( c ) C u r r e nt i nve r t e r ( d ) I m p e d an c e i nve r t e r
1 8. T h e u p p e r h a l f o f th e s m i t h ch a r t r e p re s e nt s
( a) + j x ( b ) ± j x ( c ) r ( d ) - j x
1 9. I n a s t u b m at ch i n g i t i s m o re c o nve n i e nt t o s o l ve t h e p r o b l e m u s i n g ( a) I m p e d an c e ( b ) R e ac ta n c e ( c ) A d m i t t an c e ( d ) R e s i s t a n c e
2 0. I f S W R = 1 t h e n t h e r e fl e c t i on c o e ffi c i e nt i s
( a) T wo ( b ) I n fi n i ty ( c ) O n e ( d ) Z e ro
D A A B C B A A C D A A B D D D D A C D
Monday, April 14, 2008
EMWT ONLINE 6
1 . Fo r n o r m al i n c i d e n c e of a wave o n d i e l e c tr i c - c o n d u c t or i nt e r f a c e t h e m ag n i t u d e o f r e fl e c ti o n c o e ffi c i e nt i s
( a) Z e ro ( b ) I n b e twe e n 0 a n d 1 ( c ) U n i ty ( d ) I n fi n i ty
2 . I f Γ i s re fl e c t i on c o e ffi c i e nt a n d T i s t ra n s m i s s i on c o e ffi c i e nt t h e n
( a) l Γ l = 1+ T ( b ) T = 1 +Γ ( c ) l Γ l = 1 - T ( d ) T = 1 - l Γ l
3 . . B r e w s t e r a n gl e Θ i s gi ve n by
( a) Tan Θ =S q r t ( ∈ 1 / ( ∈ 1 + ∈ 2 ) ) ( b ) Tan Θ =S q r t (( ∈ 1 + ∈ 2 ) / ∈ 1 )
( c ) Tan Θ =S q r t ( ∈ 2 / ∈ 1 ) ( d ) Tan Θ =S q r t ( ∈ 1 / ∈ 2 )
4 . T h e u n i t f o r p o i nt i n g ve c t or i s
( a) Wa t t s ( b ) Wa t t s /m ( c ) Wa t t s /m 3 ( d ) Wa t t s /m 2
5 . A u n i f or m p l a n e wave i s n or m a ll y i n c i d e nt o n a d i e l e c t r i c ( ∈ r = 4) . T h e n t h e t r an s m i s s i o n c o e ffi c i e nt i s
( a) 1 /2 ( b ) 2 /3 ( c ) 3 /2 ( d ) 1 /3
6 . G u i d e d wave s ar e th e wave s
( a) T h a t a re gu i d e d a l on g o r ove r c o n d u c t i n g or d i e l e c t r i c s u rf a c e ( b ) L i ght wave s ( c ) Wave s t h a t ar e p ro p a ga t i n g w i th i n t h e c o n d u c t or . ( d ) U n i f o r m p l a ne wave s p r op a ga t i n g i n t h e f re e s p a c e
7 . O th e r n am e of T E wave i s
( a) U n i f o r m p l a ne wave ( b ) E wave ( c ) E & H wave ( d ) H wave
8 . Fo r a z d i r e c t e d T M wave
( a) H = 0 ( b ) H z = 0 ( c ) E z = 0 ( d ) H z = E z = 0
9 . T h e c u t - o ff wave l e n g th f or a T E M wave i s
( a) H i g h ( b ) Z e ro ( c ) I n fi n i ty ( d ) L ow
1 0. C o n s i d e r a wave p r op a ga t i n g i n p a ra l l e l c on d u c t i n g p l a t e s s e p ar a te d w i t h v p = 6 × 1 0 8 m / s . T h e n v g i s
( a) 1 . 5 x1 0 8 m / s ( b ) 1 / 3 x1 0 8 m / s ( c ) 6 x1 0 8 m / s ( d ) 3 x1 0 8 m / s
1 1. T h e e l e c t r i c a l l e n g t h o f t h e t r a n s m i s s i o n l i n e i s e qu a l t o
( a) P hy s i c a l l e n g t h ( b ) β z ( c ) 2 β z ( d ) 0 . 5 β z
1 2. W h e n th e d i e l e c t r i c of a l os s y m i c r owave t ra n s m i s s i on l i n e i s n ot a i r , t h e n th e p h as e ve l o c i ty
( a) G r e a t e r t h an ve l o c i ty o f l i g ht i n vac u u m ( b ) I nve r s e l y p r o p or t i on a l t o t h e ve l o c i ty o f l i g ht i n va c u u m ( c ) E q u a l t o t he ve l o c i ty of l i ght i n va c u u m
( d ) S m a l l e r t h an ve l o c i ty o f l i g ht i n vac u u m
1 3. Fo r a l o s s l e s s l i n e i f Z L = Z 0 , t h e i m p e d a n c e a t a ny p oi nt o n t h e l i n e i s ( a) Z 0 ( b ) Z L ( c ) Z L Z 0 , ( d ) Z L / Z 0 ,
1 4. T h e l oa d i n g c o i l s a r e
( a) L u m p e d i n du c to r s ( b ) D i s t r i b u te d c a p ac i t o r ( c ) L u m p e d c ap a c i t or s ( d ) D i s t r i b u te d i n d u c t or
1 5. A l o s s l e s s l i n e h as Z 0 = 10 0 o h m s a n d β = 10 r ad / m op e ra t i n g a t 10 0 M H z . T h e n t h e c ap a c i t an c e of t h e l i n e p e r m e t e r i s
( a) 1 00 f a r ad s /m ( b ) 1 . 0 n an o f a r ad / m ( c ) 1 . 0 m i c r o f ar a d /m ( d ) 1 . 0 p F / m
1 6. I f β l < π / 2 , t h e i n p u t i m p e d an c e o f a o p e n c i r c u i te d l i n e w i l l b e
( a) R e s i s t i ve ( b ) C a p ac i ti ve ( c ) I n d u c t i ve ( d ) C o m p l e x q u ant i ty
1 7. A s h or t c i r c u i t e d λ / 4 l i n e c a n b e u s e d as
( a) A c ap a c i t or ( b ) A n i n s u l at o r ( c ) A n i n d u c to r ( d ) A c on d u c t o r
1 8. O n a s m i t h ch a r t r e al Γ ax i s re p r e s e nts
( a) P u r e l y r e s i s t i ve i m p e d a n c e ( b ) P u r e l y r e a c t i ve i m p e d a n c e ( c ) A ny a d m i tt a n c e ( d ) A ny i m p e d a n c e
1 9. I n th e s i n g l e s tu b m at ch i n g t h e l o c a t i on of t h e s t u b ch a n g e s w i th
( a) S o u rc e i m p e d a n c e ( b ) C h a r ac t e r i s t i c i m p e d a n c e ( c ) Fr e q u e n c y ( d ) L oa d i m p e d an c e
2 0. A c e r ta i n l ow l o s s l i n e h a s Z 0 = 4 00 o h m s . Fo r Z L = 2 00 o h m s , t h e S W R i s
( a) 2 ( b ) 1 /3 ( c ) 4 ( d ) 1 / 2
Cbcdb adbca bdaab bbaca
( a) Z e ro ( b ) I n b e twe e n 0 a n d 1 ( c ) U n i ty ( d ) I n fi n i ty
2 . I f Γ i s re fl e c t i on c o e ffi c i e nt a n d T i s t ra n s m i s s i on c o e ffi c i e nt t h e n
( a) l Γ l = 1+ T ( b ) T = 1 +Γ ( c ) l Γ l = 1 - T ( d ) T = 1 - l Γ l
3 . . B r e w s t e r a n gl e Θ i s gi ve n by
( a) Tan Θ =S q r t ( ∈ 1 / ( ∈ 1 + ∈ 2 ) ) ( b ) Tan Θ =S q r t (( ∈ 1 + ∈ 2 ) / ∈ 1 )
( c ) Tan Θ =S q r t ( ∈ 2 / ∈ 1 ) ( d ) Tan Θ =S q r t ( ∈ 1 / ∈ 2 )
4 . T h e u n i t f o r p o i nt i n g ve c t or i s
( a) Wa t t s ( b ) Wa t t s /m ( c ) Wa t t s /m 3 ( d ) Wa t t s /m 2
5 . A u n i f or m p l a n e wave i s n or m a ll y i n c i d e nt o n a d i e l e c t r i c ( ∈ r = 4) . T h e n t h e t r an s m i s s i o n c o e ffi c i e nt i s
( a) 1 /2 ( b ) 2 /3 ( c ) 3 /2 ( d ) 1 /3
6 . G u i d e d wave s ar e th e wave s
( a) T h a t a re gu i d e d a l on g o r ove r c o n d u c t i n g or d i e l e c t r i c s u rf a c e ( b ) L i ght wave s ( c ) Wave s t h a t ar e p ro p a ga t i n g w i th i n t h e c o n d u c t or . ( d ) U n i f o r m p l a ne wave s p r op a ga t i n g i n t h e f re e s p a c e
7 . O th e r n am e of T E wave i s
( a) U n i f o r m p l a ne wave ( b ) E wave ( c ) E & H wave ( d ) H wave
8 . Fo r a z d i r e c t e d T M wave
( a) H = 0 ( b ) H z = 0 ( c ) E z = 0 ( d ) H z = E z = 0
9 . T h e c u t - o ff wave l e n g th f or a T E M wave i s
( a) H i g h ( b ) Z e ro ( c ) I n fi n i ty ( d ) L ow
1 0. C o n s i d e r a wave p r op a ga t i n g i n p a ra l l e l c on d u c t i n g p l a t e s s e p ar a te d w i t h v p = 6 × 1 0 8 m / s . T h e n v g i s
( a) 1 . 5 x1 0 8 m / s ( b ) 1 / 3 x1 0 8 m / s ( c ) 6 x1 0 8 m / s ( d ) 3 x1 0 8 m / s
1 1. T h e e l e c t r i c a l l e n g t h o f t h e t r a n s m i s s i o n l i n e i s e qu a l t o
( a) P hy s i c a l l e n g t h ( b ) β z ( c ) 2 β z ( d ) 0 . 5 β z
1 2. W h e n th e d i e l e c t r i c of a l os s y m i c r owave t ra n s m i s s i on l i n e i s n ot a i r , t h e n th e p h as e ve l o c i ty
( a) G r e a t e r t h an ve l o c i ty o f l i g ht i n vac u u m ( b ) I nve r s e l y p r o p or t i on a l t o t h e ve l o c i ty o f l i g ht i n va c u u m ( c ) E q u a l t o t he ve l o c i ty of l i ght i n va c u u m
( d ) S m a l l e r t h an ve l o c i ty o f l i g ht i n vac u u m
1 3. Fo r a l o s s l e s s l i n e i f Z L = Z 0 , t h e i m p e d a n c e a t a ny p oi nt o n t h e l i n e i s ( a) Z 0 ( b ) Z L ( c ) Z L Z 0 , ( d ) Z L / Z 0 ,
1 4. T h e l oa d i n g c o i l s a r e
( a) L u m p e d i n du c to r s ( b ) D i s t r i b u te d c a p ac i t o r ( c ) L u m p e d c ap a c i t or s ( d ) D i s t r i b u te d i n d u c t or
1 5. A l o s s l e s s l i n e h as Z 0 = 10 0 o h m s a n d β = 10 r ad / m op e ra t i n g a t 10 0 M H z . T h e n t h e c ap a c i t an c e of t h e l i n e p e r m e t e r i s
( a) 1 00 f a r ad s /m ( b ) 1 . 0 n an o f a r ad / m ( c ) 1 . 0 m i c r o f ar a d /m ( d ) 1 . 0 p F / m
1 6. I f β l < π / 2 , t h e i n p u t i m p e d an c e o f a o p e n c i r c u i te d l i n e w i l l b e
( a) R e s i s t i ve ( b ) C a p ac i ti ve ( c ) I n d u c t i ve ( d ) C o m p l e x q u ant i ty
1 7. A s h or t c i r c u i t e d λ / 4 l i n e c a n b e u s e d as
( a) A c ap a c i t or ( b ) A n i n s u l at o r ( c ) A n i n d u c to r ( d ) A c on d u c t o r
1 8. O n a s m i t h ch a r t r e al Γ ax i s re p r e s e nts
( a) P u r e l y r e s i s t i ve i m p e d a n c e ( b ) P u r e l y r e a c t i ve i m p e d a n c e ( c ) A ny a d m i tt a n c e ( d ) A ny i m p e d a n c e
1 9. I n th e s i n g l e s tu b m at ch i n g t h e l o c a t i on of t h e s t u b ch a n g e s w i th
( a) S o u rc e i m p e d a n c e ( b ) C h a r ac t e r i s t i c i m p e d a n c e ( c ) Fr e q u e n c y ( d ) L oa d i m p e d an c e
2 0. A c e r ta i n l ow l o s s l i n e h a s Z 0 = 4 00 o h m s . Fo r Z L = 2 00 o h m s , t h e S W R i s
( a) 2 ( b ) 1 /3 ( c ) 4 ( d ) 1 / 2
Cbcdb adbca bdaab bbaca
EMWT ONLINE 5
1 . Fo r n o r m al i n c i d e n c e of th e wave on p e r f e c t c on d u c t o r
( a) S u r f a c e c u r r e nt e x i s t ( b ) Fr e e ch ar g e e xi s ts o n t h e s u rf ac e ( c ) C o n d u c t i on c u r re nt e xi s t ( d ) S u r f a c e c u r r e nt d o e s n t e xi s t
2 . I n th e c a s e of p e r p e n d i c u l a r p o l ar i z a t i on
( a) T h e H i s p e r p e n d i c u l a r t o t h e p l a n e o f i n c i d e n c e an d p ar a l le l t o t h e r e fl e c ti n g s u r f a c e
( b ) T h e E i s p a ra l l e l t o t h e p l an e of i n c i d e n c e an d p e r p e n d i c ul a r t o t h e r e fl e c ti n g s u rf ac e
( c ) T h e H i s Par a l l e l t o t h e p l a n e of i n c i d e n c e an d p e r p e n d i c u l a r t o t h e r e fl e c ti n g s ur f a c e
( d ) T h e E i s p e r p e n d i c u l ar t o t h e p l a n e of i n c i d e n c e an d p ar a l l e l t o t h e r e fl e c ti n g s u rf ac e
3 . T h e c r i ti c al an g l e i s g i ve n by
( a) Tan Θ = S q r t ( ∈ 2 / ∈ 1 ) ( b ) Tan Θ = S q r t ( ∈ 1 / ∈ 2 ) ( c ) S i n Θ = S q r t ( ∈ 1 / ∈ 2 ) ( d ) S i n Θ = S q r t ( ∈ 2 / ∈ 1 )
4 . T h e p o i nt i n g ve c t or gi ve s
( a) T h e d i r e c t i on of E fi e l d ( b ) T h e d i r e c t i on of wave p r o p ag at i o n ( c ) T h e d i r e c t i on of H fi e l d ( d ) T h e d i r e c t i on of b o th E a n d H fi e l d s
5 . I f r e fl e c t i o n c o e ffi c i e nt = - 1 / 2 t h e n t h e s w r i s
( a) O n e ( b ) Z e ro ( c ) 3 ( d ) 1 /3
6 . Fo r a z p r op a ga t i n g e m wave , i f p ro p a ga ti o n c on s t a nt i s r e a l t h e n (
a) N o wave m ot i on ( b ) T h e wave t r ave l s i n z d i re c ti o n ( c ) Wave t r ave l s w it h an e x p on e nt i a l d e c r e a s e i n a m p l i tu d e ( d ) Wave t r ave l s w it h n o ch an g e i n am p l i t u d e
7 . O th e r n am e of T E wave i s
( a) U n i f o r m p l a ne wave ( b ) H wave ( c ) E wave ( d ) E & H wave
8 . I f op e r at i n g f r e q u e n c y i s g re at e r t h a n t h e c u to ff wave l e n gt h , th e n
( a) α = β ( b ) α = Z e ro ( c ) α = i n fi n i ty ( d ) α = 1 / β
9 . A m o d e w h i ch d o e s n ot p ro p a ga te i s
( a) E van e s c e nt m o d e ( b ) D om i n a nt m o d e ( c ) P r i n c i p a l wave ( d ) T E m o d e
1 0. W h e n a wave i s tr ave l i n g i n Z d i re c ti o n , t h e n i t s i mp e d an c e i s gi ve n by ( a) - E y / H x ( b ) E y / H x ( c ) E x / H y ( d ) - E x / H y
1 1. A two c o n d u c t or t r a n s m i s s i o n l i n e s u p p o rt s
( a) T E M m o d e wave ( b ) T M m o d e wave on l y ( c ) T E m o d e wave on l y ( d ) B o t h T E a n d T M m o d e wave s
1 2. T h e u n i t f o r at t e nu a ti o n c o n s t a nt i s
( a) d B / m ( b ) Vo l t /m ( c ) A m p . / m ( d ) R ad i a n / m
1 3. A l o s s y tr a n s m i s s i o n l i n e
( a) N o n D i s p e r s i ve ( b ) I t mu s t b e a d i s to r ti o n l e s s l i n e
( c ) H ave i n fi n i te l os s ( d ) D i s p e r s i ve
1 4. I f L T a n d C T a re t h e to t al i n d u c t an c e a n d to t al c a p ac i t a n c e of t h e l i ne i n c l u d i n g th e l o ad i n g c o i l s , t h e n i t s c u t o ff f r e q u e n c y i s g i ve n by
( a) 1 / ( π . s q r t (L T C T ) ) ( b ) π / s q r t (L T C T ) ( c ) π . s q r t (L T C T ) ( d ) 1 / ( 2 π . s q r t (L T C T ) )
1 5. A l ow l o s s t ra n s m i s s i on l i n e o p e r at i n g a t 10 0 M H z h a s L = 0. 2 5 m i c r o h e n r y/ m , C = 1 00 p F / m . T h e n t h e p h as e c o n s t ant i s
( a) 1 / π ( b ) 2 π ( c ) π ( d ) 3 π
1 6. I n p u t i m p e d an c e o f a s h o r t c i r c u i t e d t r a n s m i s s i o n l i n e b e c o m e s
( a) P u r e re s i s t i ve ( b ) c o m p l e x q u ant i ty ( c ) Z e ro ( d ) P u r e re ac t i ve
1 7. A s h or t c i r c u i t e d λ / 4 l i n e c a n b e u s e d as
( a) A c ap a c i t or ( b ) A n i n d u c to r ( c ) A n i n s u l at o r ( d ) A c on d u c t o r
1 8. O n a t ra n s m i s s i on l i n e V m a x a n d V m i n a re s e p a r at e d by th e d i s t a n c e o f ( a) λ / 8 ( b ) λ / 2 ( c ) λ / 4 ( d ) λ
1 9. T h e s t u b l e n g t h t o b e ad j u s t e d
( a) To n e u t ra l i z e th e s u s c e p t an c e of t h e l o a d ( b ) To i n c r e as e t h e s u s c e p t a n c e o f th e l oa d ( c ) To d e c r e as e t h e s u s c e p t a n c e of t h e l o ad ( d ) N o t t o ch an g e t h e s u s c e p t a n c e of t he l o ad
2 0. T wo ve r y l o n g l o s s l e s s c ab l e s of ch a r ac te ri s ti c i mp e d an c e s o f 36 oh m s an d 1 00 oh m s r e s p e c t i ve l y a r e t o b e j oi n e d f o r r e fl e c t i o n l e s s t r an s m i s s i on . T h e Z 0 o f a m a tch i n g t r a n s f o rm e r i s
( a) 3 6 oh m s ( b ) 1 /3 6 oh m s ( c ) 6 0 oh m s ( d ) 1 00 o h m s
ADDBC ABBAC AADAC DCCAC
( a) S u r f a c e c u r r e nt e x i s t ( b ) Fr e e ch ar g e e xi s ts o n t h e s u rf ac e ( c ) C o n d u c t i on c u r re nt e xi s t ( d ) S u r f a c e c u r r e nt d o e s n t e xi s t
2 . I n th e c a s e of p e r p e n d i c u l a r p o l ar i z a t i on
( a) T h e H i s p e r p e n d i c u l a r t o t h e p l a n e o f i n c i d e n c e an d p ar a l le l t o t h e r e fl e c ti n g s u r f a c e
( b ) T h e E i s p a ra l l e l t o t h e p l an e of i n c i d e n c e an d p e r p e n d i c ul a r t o t h e r e fl e c ti n g s u rf ac e
( c ) T h e H i s Par a l l e l t o t h e p l a n e of i n c i d e n c e an d p e r p e n d i c u l a r t o t h e r e fl e c ti n g s ur f a c e
( d ) T h e E i s p e r p e n d i c u l ar t o t h e p l a n e of i n c i d e n c e an d p ar a l l e l t o t h e r e fl e c ti n g s u rf ac e
3 . T h e c r i ti c al an g l e i s g i ve n by
( a) Tan Θ = S q r t ( ∈ 2 / ∈ 1 ) ( b ) Tan Θ = S q r t ( ∈ 1 / ∈ 2 ) ( c ) S i n Θ = S q r t ( ∈ 1 / ∈ 2 ) ( d ) S i n Θ = S q r t ( ∈ 2 / ∈ 1 )
4 . T h e p o i nt i n g ve c t or gi ve s
( a) T h e d i r e c t i on of E fi e l d ( b ) T h e d i r e c t i on of wave p r o p ag at i o n ( c ) T h e d i r e c t i on of H fi e l d ( d ) T h e d i r e c t i on of b o th E a n d H fi e l d s
5 . I f r e fl e c t i o n c o e ffi c i e nt = - 1 / 2 t h e n t h e s w r i s
( a) O n e ( b ) Z e ro ( c ) 3 ( d ) 1 /3
6 . Fo r a z p r op a ga t i n g e m wave , i f p ro p a ga ti o n c on s t a nt i s r e a l t h e n (
a) N o wave m ot i on ( b ) T h e wave t r ave l s i n z d i re c ti o n ( c ) Wave t r ave l s w it h an e x p on e nt i a l d e c r e a s e i n a m p l i tu d e ( d ) Wave t r ave l s w it h n o ch an g e i n am p l i t u d e
7 . O th e r n am e of T E wave i s
( a) U n i f o r m p l a ne wave ( b ) H wave ( c ) E wave ( d ) E & H wave
8 . I f op e r at i n g f r e q u e n c y i s g re at e r t h a n t h e c u to ff wave l e n gt h , th e n
( a) α = β ( b ) α = Z e ro ( c ) α = i n fi n i ty ( d ) α = 1 / β
9 . A m o d e w h i ch d o e s n ot p ro p a ga te i s
( a) E van e s c e nt m o d e ( b ) D om i n a nt m o d e ( c ) P r i n c i p a l wave ( d ) T E m o d e
1 0. W h e n a wave i s tr ave l i n g i n Z d i re c ti o n , t h e n i t s i mp e d an c e i s gi ve n by ( a) - E y / H x ( b ) E y / H x ( c ) E x / H y ( d ) - E x / H y
1 1. A two c o n d u c t or t r a n s m i s s i o n l i n e s u p p o rt s
( a) T E M m o d e wave ( b ) T M m o d e wave on l y ( c ) T E m o d e wave on l y ( d ) B o t h T E a n d T M m o d e wave s
1 2. T h e u n i t f o r at t e nu a ti o n c o n s t a nt i s
( a) d B / m ( b ) Vo l t /m ( c ) A m p . / m ( d ) R ad i a n / m
1 3. A l o s s y tr a n s m i s s i o n l i n e
( a) N o n D i s p e r s i ve ( b ) I t mu s t b e a d i s to r ti o n l e s s l i n e
( c ) H ave i n fi n i te l os s ( d ) D i s p e r s i ve
1 4. I f L T a n d C T a re t h e to t al i n d u c t an c e a n d to t al c a p ac i t a n c e of t h e l i ne i n c l u d i n g th e l o ad i n g c o i l s , t h e n i t s c u t o ff f r e q u e n c y i s g i ve n by
( a) 1 / ( π . s q r t (L T C T ) ) ( b ) π / s q r t (L T C T ) ( c ) π . s q r t (L T C T ) ( d ) 1 / ( 2 π . s q r t (L T C T ) )
1 5. A l ow l o s s t ra n s m i s s i on l i n e o p e r at i n g a t 10 0 M H z h a s L = 0. 2 5 m i c r o h e n r y/ m , C = 1 00 p F / m . T h e n t h e p h as e c o n s t ant i s
( a) 1 / π ( b ) 2 π ( c ) π ( d ) 3 π
1 6. I n p u t i m p e d an c e o f a s h o r t c i r c u i t e d t r a n s m i s s i o n l i n e b e c o m e s
( a) P u r e re s i s t i ve ( b ) c o m p l e x q u ant i ty ( c ) Z e ro ( d ) P u r e re ac t i ve
1 7. A s h or t c i r c u i t e d λ / 4 l i n e c a n b e u s e d as
( a) A c ap a c i t or ( b ) A n i n d u c to r ( c ) A n i n s u l at o r ( d ) A c on d u c t o r
1 8. O n a t ra n s m i s s i on l i n e V m a x a n d V m i n a re s e p a r at e d by th e d i s t a n c e o f ( a) λ / 8 ( b ) λ / 2 ( c ) λ / 4 ( d ) λ
1 9. T h e s t u b l e n g t h t o b e ad j u s t e d
( a) To n e u t ra l i z e th e s u s c e p t an c e of t h e l o a d ( b ) To i n c r e as e t h e s u s c e p t a n c e o f th e l oa d ( c ) To d e c r e as e t h e s u s c e p t a n c e of t h e l o ad ( d ) N o t t o ch an g e t h e s u s c e p t a n c e of t he l o ad
2 0. T wo ve r y l o n g l o s s l e s s c ab l e s of ch a r ac te ri s ti c i mp e d an c e s o f 36 oh m s an d 1 00 oh m s r e s p e c t i ve l y a r e t o b e j oi n e d f o r r e fl e c t i o n l e s s t r an s m i s s i on . T h e Z 0 o f a m a tch i n g t r a n s f o rm e r i s
( a) 3 6 oh m s ( b ) 1 /3 6 oh m s ( c ) 6 0 oh m s ( d ) 1 00 o h m s
ADDBC ABBAC AADAC DCCAC
EMWT ONLINE 4
1 . At t h e d i e l e c t ri c c o n d u c t or i nt e r f a c e
( a) T h e H i s h al f of t h e i n c i d e nt fi e l d ( b ) T h e E i s h al f o f t h e i n c i d e nt fi e l d ( c ) T h e E i s d ou b l e o f t h e i n c i d e nt fi e l d
( d ) T h e H i s d ou b l e of t h e i n c i d e nt fi e l d
2 . T h e e x p re s s i o n f o r s n e l l s l aw i s
( a) S i n Θ 2 / S i n Θ 1 = S q r t( ∈ 2 / ∈ 1 ) ( b ) S i n Θ 1 / S i n Θ 2 = S q r t( ∈ 1 / ( ∈ 1 + ∈ 2 ) ) ( c ) S i n Θ 1 / S i n Θ 2 = S q r t( ∈ 2 / ( ∈ 1 + ∈ 2 ) )
( d ) S i n Θ 1 / S i n Θ 2 = S q r t( ∈ 2 / ∈ 1 )
3 . T h e To t al i nt e r n a l r e fl e c t i o n c a n t a ke s p l a c e
( a) I f t h e wave tr ave l s f r o m D e n s e r to D e n s e r m e d i u m ( b ) I f t h e wave tr ave l s f r o m R ar e r t o D e n s e r m e d i u m ( c ) I f t h e wave tr ave l s f r o m R ar e r t o R ar e r m e d i u m ( d ) I f t h e wave tr ave l s f r o m D e n s e r to R ar e r m e d i u m
4 . S u r f a c e i m p e d an c e i s a u s e f u l p a r am e te r i n c o m p u t i n g
( a) Poy nt i n g ve c to r ( b ) D i e l e c t r i c l o s s e s ( c ) M a gn i t u d e of e l e c t r i c fi e l d ( d ) C o n d u c t or l o s s e s
5 . A u n i f o r m p l a n e wave h avi n g 2 5 W / m 2 p owe r d e n s i ty i s n o r m al l y i n c i d e nt o n a d i e l e c tr i c s h e e t . I f t h e t ra n s m i s s i on c o e ffi c i e nt i s 3 /5 t h e n th e p owe r d e n s i ty o f t h e t r a n s m i t te d wave i s
( a) 1 8 W /m 2 ( b ) 2 7 W /m 2 ( c ) 1 5 W /m 2 ( d ) 9 W / m 2
6 . I f t h e p r o p ag at i o n c o n s t ant i s a r e al q u ant i ty th e n t h e wave
( a) I n c r e a s e s l i n e a r l y
( b ) D e c r e a s e s e x p o ne nt i a l l y ( c ) D e c r e a s e s l i n e a rl y ( d ) I n c r e a s e s e x p o n e nti a l l y
7 . T h e l owe s t or d e r m o d e of T E wave s b e twe e n p a ra l l e l c on d u c to r s ( a) T E 1 1 ( b ) T E 1 0 ( c ) T E 1 2 ( d ) T E 0 0
8 . T h e p r op a ga t i on c on s ta nt b e twe e n p ar a l l e l p l a te s i s
( a) ( m π / a ) 2 + (n π / b ) 2 - ω 2 µ 0 ε 0
( b ) ( m π / a ) 2 - ω 2 µ 0 ε 0 ( c ) ( m π / a ) 2 + ω 2 µ 0 ε 0 ( d ) ( m π / a ) 2 + (n π / b ) 2 + ω 2 µ 0 ε 0
9 . At te nu a t i on f ac to r f o r a T E M wave i s p r o p or t i o n al to
( a) S q r t( Fr e q u e n c y ) ( b ) Z 0 ( c ) Fr e q u e n c y ( d ) C o n d u c t i vi ty
1 0. C o n s i d e r a wave p r op a ga t i n g i n p a ra l l e l c on d u c t i n g p l a t e s s e p ar a te d w i t h v p = 6 × 1 0 8 m / s . T h e n v g i s
( a) 1 . 5 x1 0 8 m / s ( b ) 1 / 3 x1 0 8 m / s ( c ) 6 x1 0 8 m / s ( d ) 3 x1 0 8 m / s
1 1. T wo w i r e tr a n s m i s s i o n l i n e s c o n s i s t s of a p a i r of p ar a l l e l c on d u c t i n g w i r e s s e p a r at e d by
( a) I n fi n i t e d i s t an c e ( b ) N o n u n i f o r m d i s t an c e ( c ) Z e ro d i s ta n c e ( d ) U n i f o r m d i s t a n c e
1 2. I n a tr a n s m i s s i o n l i n e t h e d i s t a n c e b e twe e n two s u c c e s s i ve
m i n i m a i s ( a) λ / 3 ( b ) λ / 2 ( c ) λ ( d ) λ / 4
1 3. Fo r a l o s s l e s s l i n e t h e ch a ra c t e r i s t i c i m p e d an c e i s
( a) Z 0 = S q r t ( LC ) ( b ) R 0 = S q r t ( 1 / L C ) ( c ) Z 0 = S q r t ( C / L )
( d ) R 0 = S q r t ( L / C )
1 4. H y s t e r e s i s an d e d d y c u r r e nt l o s s e s i n l o ad i n g c oi l s l e ad s t o
( a) I n c r e a s e i n L ( b ) I n c r e a s e i n R ( c ) D e c r e a s e i n L ( d ) D e c r e a s e i n R
1 5. h i g h f r e q u e n c y l i n e h a s L = 0. 1 m H / K m , C = 0 . 1 m i c r o f ar ad s /K m . I f R & G ar e n e gl i g i b l e , t h e n ch ar a c te ri s ti c i m p e d a n c e i s
( a) 1 00 O h m s ( b ) 5 0 Oh m s ( c ) 4 00 O h m s ( d ) 2 00 O h m s
1 6. T h e i n c i d e nt p owe r i s f u l l y a bs or b e d by t h e l o ad i f
( a) Z L = i n fi n i ty ( b ) Z L = 0 ( c ) Z L = Z 0 ( d ) Z L = Z 0
1 7. A n e qu a t i on Z i n = Z 2 0 /Z L a p p l i e s t o
( a) λ / 4 l i n e ( b ) λ / 8 l i n e ( c ) λ / 2 l i n e ( d ) λ 1 6 l i n e
1 8. T h e u p p e r h a l f o f th e s m i t h ch a r t r e p re s e nt s ( a) r ( b ) - j x ( c ) ± j x ( d ) + j x
1 9. A s i n gl e s t u b m a tch i n g i s a
( a) B a n d r e j e c t s y s t e m ( b ) N a rr ow b a n d s y s t e m ( c ) Pa s s b a n d s ys te m ( d ) B r o ad b an d s y s t e m
2 0. C o n s i d e r a 5 m l e n g t h t r an s m i s s i on l i n e i s p r op e rl y te rm i n a t e d w i t h 5 0 o h m s L o ad T h e n t h e i n pu t i m p e d a n c e a t 3 m f r o m s o u rc e e n d i s
( a) 1 00 o h m s ( b ) 2 5 oh m s ( c ) 5 0 oh m s ( d ) 7 5 oh
DDDDD BBBAA DBDBA DADBC
( a) T h e H i s h al f of t h e i n c i d e nt fi e l d ( b ) T h e E i s h al f o f t h e i n c i d e nt fi e l d ( c ) T h e E i s d ou b l e o f t h e i n c i d e nt fi e l d
( d ) T h e H i s d ou b l e of t h e i n c i d e nt fi e l d
2 . T h e e x p re s s i o n f o r s n e l l s l aw i s
( a) S i n Θ 2 / S i n Θ 1 = S q r t( ∈ 2 / ∈ 1 ) ( b ) S i n Θ 1 / S i n Θ 2 = S q r t( ∈ 1 / ( ∈ 1 + ∈ 2 ) ) ( c ) S i n Θ 1 / S i n Θ 2 = S q r t( ∈ 2 / ( ∈ 1 + ∈ 2 ) )
( d ) S i n Θ 1 / S i n Θ 2 = S q r t( ∈ 2 / ∈ 1 )
3 . T h e To t al i nt e r n a l r e fl e c t i o n c a n t a ke s p l a c e
( a) I f t h e wave tr ave l s f r o m D e n s e r to D e n s e r m e d i u m ( b ) I f t h e wave tr ave l s f r o m R ar e r t o D e n s e r m e d i u m ( c ) I f t h e wave tr ave l s f r o m R ar e r t o R ar e r m e d i u m ( d ) I f t h e wave tr ave l s f r o m D e n s e r to R ar e r m e d i u m
4 . S u r f a c e i m p e d an c e i s a u s e f u l p a r am e te r i n c o m p u t i n g
( a) Poy nt i n g ve c to r ( b ) D i e l e c t r i c l o s s e s ( c ) M a gn i t u d e of e l e c t r i c fi e l d ( d ) C o n d u c t or l o s s e s
5 . A u n i f o r m p l a n e wave h avi n g 2 5 W / m 2 p owe r d e n s i ty i s n o r m al l y i n c i d e nt o n a d i e l e c tr i c s h e e t . I f t h e t ra n s m i s s i on c o e ffi c i e nt i s 3 /5 t h e n th e p owe r d e n s i ty o f t h e t r a n s m i t te d wave i s
( a) 1 8 W /m 2 ( b ) 2 7 W /m 2 ( c ) 1 5 W /m 2 ( d ) 9 W / m 2
6 . I f t h e p r o p ag at i o n c o n s t ant i s a r e al q u ant i ty th e n t h e wave
( a) I n c r e a s e s l i n e a r l y
( b ) D e c r e a s e s e x p o ne nt i a l l y ( c ) D e c r e a s e s l i n e a rl y ( d ) I n c r e a s e s e x p o n e nti a l l y
7 . T h e l owe s t or d e r m o d e of T E wave s b e twe e n p a ra l l e l c on d u c to r s ( a) T E 1 1 ( b ) T E 1 0 ( c ) T E 1 2 ( d ) T E 0 0
8 . T h e p r op a ga t i on c on s ta nt b e twe e n p ar a l l e l p l a te s i s
( a) ( m π / a ) 2 + (n π / b ) 2 - ω 2 µ 0 ε 0
( b ) ( m π / a ) 2 - ω 2 µ 0 ε 0 ( c ) ( m π / a ) 2 + ω 2 µ 0 ε 0 ( d ) ( m π / a ) 2 + (n π / b ) 2 + ω 2 µ 0 ε 0
9 . At te nu a t i on f ac to r f o r a T E M wave i s p r o p or t i o n al to
( a) S q r t( Fr e q u e n c y ) ( b ) Z 0 ( c ) Fr e q u e n c y ( d ) C o n d u c t i vi ty
1 0. C o n s i d e r a wave p r op a ga t i n g i n p a ra l l e l c on d u c t i n g p l a t e s s e p ar a te d w i t h v p = 6 × 1 0 8 m / s . T h e n v g i s
( a) 1 . 5 x1 0 8 m / s ( b ) 1 / 3 x1 0 8 m / s ( c ) 6 x1 0 8 m / s ( d ) 3 x1 0 8 m / s
1 1. T wo w i r e tr a n s m i s s i o n l i n e s c o n s i s t s of a p a i r of p ar a l l e l c on d u c t i n g w i r e s s e p a r at e d by
( a) I n fi n i t e d i s t an c e ( b ) N o n u n i f o r m d i s t an c e ( c ) Z e ro d i s ta n c e ( d ) U n i f o r m d i s t a n c e
1 2. I n a tr a n s m i s s i o n l i n e t h e d i s t a n c e b e twe e n two s u c c e s s i ve
m i n i m a i s ( a) λ / 3 ( b ) λ / 2 ( c ) λ ( d ) λ / 4
1 3. Fo r a l o s s l e s s l i n e t h e ch a ra c t e r i s t i c i m p e d an c e i s
( a) Z 0 = S q r t ( LC ) ( b ) R 0 = S q r t ( 1 / L C ) ( c ) Z 0 = S q r t ( C / L )
( d ) R 0 = S q r t ( L / C )
1 4. H y s t e r e s i s an d e d d y c u r r e nt l o s s e s i n l o ad i n g c oi l s l e ad s t o
( a) I n c r e a s e i n L ( b ) I n c r e a s e i n R ( c ) D e c r e a s e i n L ( d ) D e c r e a s e i n R
1 5. h i g h f r e q u e n c y l i n e h a s L = 0. 1 m H / K m , C = 0 . 1 m i c r o f ar ad s /K m . I f R & G ar e n e gl i g i b l e , t h e n ch ar a c te ri s ti c i m p e d a n c e i s
( a) 1 00 O h m s ( b ) 5 0 Oh m s ( c ) 4 00 O h m s ( d ) 2 00 O h m s
1 6. T h e i n c i d e nt p owe r i s f u l l y a bs or b e d by t h e l o ad i f
( a) Z L = i n fi n i ty ( b ) Z L = 0 ( c ) Z L = Z 0 ( d ) Z L = Z 0
1 7. A n e qu a t i on Z i n = Z 2 0 /Z L a p p l i e s t o
( a) λ / 4 l i n e ( b ) λ / 8 l i n e ( c ) λ / 2 l i n e ( d ) λ 1 6 l i n e
1 8. T h e u p p e r h a l f o f th e s m i t h ch a r t r e p re s e nt s ( a) r ( b ) - j x ( c ) ± j x ( d ) + j x
1 9. A s i n gl e s t u b m a tch i n g i s a
( a) B a n d r e j e c t s y s t e m ( b ) N a rr ow b a n d s y s t e m ( c ) Pa s s b a n d s ys te m ( d ) B r o ad b an d s y s t e m
2 0. C o n s i d e r a 5 m l e n g t h t r an s m i s s i on l i n e i s p r op e rl y te rm i n a t e d w i t h 5 0 o h m s L o ad T h e n t h e i n pu t i m p e d a n c e a t 3 m f r o m s o u rc e e n d i s
( a) 1 00 o h m s ( b ) 2 5 oh m s ( c ) 5 0 oh m s ( d ) 7 5 oh
DDDDD BBBAA DBDBA DADBC
EMWT ONLINE 3
1 . Fo r n o r m al i n c i d e n c e of a wave o n d i e l e c tr i c - c o n d u c t or i nt e r f a c e t h e m ag n i t u d e o f r e fl e c ti o n c o e ffi c i e nt i s
( a) I n fi n i ty ( b ) I n b e twe e n 0 a n d 1 ( c ) Z e ro ( d ) U n i ty
2 . T h e r an g e o f r e fl e c t i on c o e ffi c i e nt i s
( a) - 1 t o 1 ( b ) - i n fi n i ty t o + i n fi n i ty ( c ) 0 t o i n fi n i ty ( d ) 0 t o 1
3 . W h e n i n c i d e nt an g l e i s B re w s t e r a n gl e t h e n
( a) N o r e fl e c t i o n t ake s p l ac e ( b ) Pa rt i a l t r an s m i s s i on on l y ta ke s p l a c e ( c ) C o m p l e t e r e fl e c ti o n t a ke s p l a c e ( d ) Pa rt i a l r e fl e c t i o n o n l y t ake s p l ac e
4 . T h e p o i nt i n g ve c t or gi ve s
( a) T h e d i r e c t i on of E fi e l d ( b ) T h e d i r e c t i on of wave p r o p ag at i o n ( c ) T h e d i r e c t i on of b o th E a n d H fi e l d s ( d ) T h e d i r e c t i on of H fi e l d
5 . T h e m ag n e t i c fi e l d a t t h e s u r f a c e o f a g o o d c on d u c to r i s 2 A /m . T h e f r e q u e n c y of t h e fi e l d i s 6 00 M H z . T h e s u rf ac e r m s c u rr e nt d e n s i ty i s
( a) 2 A / m 2 ( b ) 1 /2 A / m ( c ) 2 A / m ( d ) 1 /2 A / m 2
6 . T h e wave a l on g a c o- ax i al t ra n s m i s s i on l i n e i s an e x am p l e f o r
( a) L i ght wave ( b ) G u i d e d wave ( c ) U n i f o r m p l a ne wave ( d ) U n g u i d e d wave
7 . T h e e q u i p h as e s u r f a c e s p r og r e s s e s a l on g t h e g u i d e w i t h a ve l o c i ty
( a) ω / ss ( b ) ss / ω ( c ) d ω / d ss ( d ) L i ght ve l o c i ty
8 . T h e ve l o c i ty o f p r o p ag a ti o n o f e qu i p h a s e s u r f a c e s a l o n g th e g u i d e i s
( a) P h a s e ve l o c i ty ( b ) G u i d e ve l o c i ty ( c ) G r o u p ve l o c i ty ( d ) L i ght ve l o c i ty
9 . T E M m o d e i s e q u al t o
( a) T M 1 0 ( b ) T E 0 0 ( c ) T M 0 0 ( d ) T E 1 0
1 0. T h e wave i m p e d an c e ove r t h e c r os s s e c ti o n o f th e gu i d e i s
( a) D e c r e a s e s w i t h f r e q u e n c y ( b ) I n c r e a s e s w i t h f re qu e n c y ( c ) I n c r e a s e s e x p o n e nti a l l y ( d ) C o n s t ant
1 1. I n a c oa x i al t ra n s m i s s i on l i n e e l e c tr i c an d m ag n e t i c fi e l d s a re
( a) C o n fi n e d t o a d i e l e c tr i c m e d i u m ( b ) C o n fi n e d t o t h e i n n e r c on d u c to r ( c ) N o t C o n fi n e d t o d i e l e c t r i c me d i u m ( d ) C o n fi n e d t o t h e o u t e r c o n d u c t or
1 2. I n a tr a n s m i s s i o n l i n e t h e vol t a ge a n d c u r r e nt s t an d i n g wave s a re
( a) 9 0 0 o u t of p h a s e a l on g t h e l i n e ( b ) 0 0 o u t of p h a s e a l on g t h e l i n e ( c ) 1 80 0 o u t of p h a s e a l on g t h e l i n e ( d ) 2 70 0 o u t of p h a s e a l on g t h e l i n e
1 3. Fo r a l ow l o s s l i n e t h e p h a s e ve l o c i ty i s
( a) I n c r e a s e s w i t h s qu a r e o f f re qu e n c y ( b ) A p p r ox i m a te ly c on s ta nt ( c ) I n c r e a s e s w i t h f re qu e n c y ( d ) D e c r e a s e s w i t h f r e q u e n c y
1 4. A l u m p e d l o ad e d l i n e s b e h ave s as a
( a) B a n d r e j e c t fi l t e r ( b ) B a n d p a s s fi l t e r ( c ) H i g h p a s s fi l t e r
( d ) L ow p as s fi l t e r
1 5. O n e n e p e r i s e qu a l t o
( a) 8 . 86 d B ( b ) 1 0 d B ( c ) 6 . 86 d B ( d ) 8 . 68 d B
1 6. t h e r e fl e c t io n c o e ffi c i e nt f o r a s h o rt c i r c u i t e d t r an s m i s s i on l i n e i s
( a) I n fi n i ty ( b ) - 1 ( c ) Z e ro ( d ) + 1
1 7. A λ / 4 l i n e m ay b e c on s i d e re d a s
( a) Vo l t ag e i nve r t e r ( b ) Powe r i nve r t e r ( c ) C u r r e nt i nve r t e r
( d ) I m p e d an c e i nve r t e r
1 8. T h e u p p e r h a l f o f th e s m i t h ch a r t r e p re s e nt s
( a) + j x ( b ) ± j x ( c ) r ( d ) - j x
1 9. I n a s t u b m at ch i n g i t i s m o re c o nve n i e nt t o s o l ve t h e p r o b l e m u s i n g
( a) I m p e d an c e ( b ) R e ac ta n c e ( c ) A d m i t t an c e ( d ) R e s i s t a n c e
2 0. I f S W R = 1 t h e n t h e r e fl e c t i on c o e ffi c i e nt i s
( a) T wo ( b ) I n fi n i ty ( c ) O n e ( d ) Z e ro
D A A B C B A A C D A A B D D D D A C D
( a) I n fi n i ty ( b ) I n b e twe e n 0 a n d 1 ( c ) Z e ro ( d ) U n i ty
2 . T h e r an g e o f r e fl e c t i on c o e ffi c i e nt i s
( a) - 1 t o 1 ( b ) - i n fi n i ty t o + i n fi n i ty ( c ) 0 t o i n fi n i ty ( d ) 0 t o 1
3 . W h e n i n c i d e nt an g l e i s B re w s t e r a n gl e t h e n
( a) N o r e fl e c t i o n t ake s p l ac e ( b ) Pa rt i a l t r an s m i s s i on on l y ta ke s p l a c e ( c ) C o m p l e t e r e fl e c ti o n t a ke s p l a c e ( d ) Pa rt i a l r e fl e c t i o n o n l y t ake s p l ac e
4 . T h e p o i nt i n g ve c t or gi ve s
( a) T h e d i r e c t i on of E fi e l d ( b ) T h e d i r e c t i on of wave p r o p ag at i o n ( c ) T h e d i r e c t i on of b o th E a n d H fi e l d s ( d ) T h e d i r e c t i on of H fi e l d
5 . T h e m ag n e t i c fi e l d a t t h e s u r f a c e o f a g o o d c on d u c to r i s 2 A /m . T h e f r e q u e n c y of t h e fi e l d i s 6 00 M H z . T h e s u rf ac e r m s c u rr e nt d e n s i ty i s
( a) 2 A / m 2 ( b ) 1 /2 A / m ( c ) 2 A / m ( d ) 1 /2 A / m 2
6 . T h e wave a l on g a c o- ax i al t ra n s m i s s i on l i n e i s an e x am p l e f o r
( a) L i ght wave ( b ) G u i d e d wave ( c ) U n i f o r m p l a ne wave ( d ) U n g u i d e d wave
7 . T h e e q u i p h as e s u r f a c e s p r og r e s s e s a l on g t h e g u i d e w i t h a ve l o c i ty
( a) ω / ss ( b ) ss / ω ( c ) d ω / d ss ( d ) L i ght ve l o c i ty
8 . T h e ve l o c i ty o f p r o p ag a ti o n o f e qu i p h a s e s u r f a c e s a l o n g th e g u i d e i s
( a) P h a s e ve l o c i ty ( b ) G u i d e ve l o c i ty ( c ) G r o u p ve l o c i ty ( d ) L i ght ve l o c i ty
9 . T E M m o d e i s e q u al t o
( a) T M 1 0 ( b ) T E 0 0 ( c ) T M 0 0 ( d ) T E 1 0
1 0. T h e wave i m p e d an c e ove r t h e c r os s s e c ti o n o f th e gu i d e i s
( a) D e c r e a s e s w i t h f r e q u e n c y ( b ) I n c r e a s e s w i t h f re qu e n c y ( c ) I n c r e a s e s e x p o n e nti a l l y ( d ) C o n s t ant
1 1. I n a c oa x i al t ra n s m i s s i on l i n e e l e c tr i c an d m ag n e t i c fi e l d s a re
( a) C o n fi n e d t o a d i e l e c tr i c m e d i u m ( b ) C o n fi n e d t o t h e i n n e r c on d u c to r ( c ) N o t C o n fi n e d t o d i e l e c t r i c me d i u m ( d ) C o n fi n e d t o t h e o u t e r c o n d u c t or
1 2. I n a tr a n s m i s s i o n l i n e t h e vol t a ge a n d c u r r e nt s t an d i n g wave s a re
( a) 9 0 0 o u t of p h a s e a l on g t h e l i n e ( b ) 0 0 o u t of p h a s e a l on g t h e l i n e ( c ) 1 80 0 o u t of p h a s e a l on g t h e l i n e ( d ) 2 70 0 o u t of p h a s e a l on g t h e l i n e
1 3. Fo r a l ow l o s s l i n e t h e p h a s e ve l o c i ty i s
( a) I n c r e a s e s w i t h s qu a r e o f f re qu e n c y ( b ) A p p r ox i m a te ly c on s ta nt ( c ) I n c r e a s e s w i t h f re qu e n c y ( d ) D e c r e a s e s w i t h f r e q u e n c y
1 4. A l u m p e d l o ad e d l i n e s b e h ave s as a
( a) B a n d r e j e c t fi l t e r ( b ) B a n d p a s s fi l t e r ( c ) H i g h p a s s fi l t e r
( d ) L ow p as s fi l t e r
1 5. O n e n e p e r i s e qu a l t o
( a) 8 . 86 d B ( b ) 1 0 d B ( c ) 6 . 86 d B ( d ) 8 . 68 d B
1 6. t h e r e fl e c t io n c o e ffi c i e nt f o r a s h o rt c i r c u i t e d t r an s m i s s i on l i n e i s
( a) I n fi n i ty ( b ) - 1 ( c ) Z e ro ( d ) + 1
1 7. A λ / 4 l i n e m ay b e c on s i d e re d a s
( a) Vo l t ag e i nve r t e r ( b ) Powe r i nve r t e r ( c ) C u r r e nt i nve r t e r
( d ) I m p e d an c e i nve r t e r
1 8. T h e u p p e r h a l f o f th e s m i t h ch a r t r e p re s e nt s
( a) + j x ( b ) ± j x ( c ) r ( d ) - j x
1 9. I n a s t u b m at ch i n g i t i s m o re c o nve n i e nt t o s o l ve t h e p r o b l e m u s i n g
( a) I m p e d an c e ( b ) R e ac ta n c e ( c ) A d m i t t an c e ( d ) R e s i s t a n c e
2 0. I f S W R = 1 t h e n t h e r e fl e c t i on c o e ffi c i e nt i s
( a) T wo ( b ) I n fi n i ty ( c ) O n e ( d ) Z e ro
D A A B C B A A C D A A B D D D D A C D
EMWT ONLINE 2
1 . T h e u n i t f o r s u r f a c e c u rr e nt
( a) A m p e r e / m ( b ) a m p e r e /m 3 ( c ) A m p e r e ( d ) A m p e r e / m 2
2 . A s p e r t h e b ou n d a r y c o n d i ti o n ( a) T h e t an g e nti a l c om p o n e nt s o f E i s c ont i nu ou s a c ro s s t h e b o u n d a ry. ( b ) T h e n or m a l c o m p o n e nt s of E i s c o nt i nu o u s ac r o s s th e b o u n d ar y. ( c ) T h e t an g e nti a l c om p o n e nt s o f D i s c o nt i nu o u s ac r o s s th e b o u n d ar y. ( d ) T h e n or m a l c o m p o n e nt s of H i s c o nti nu o u s a c r o s s t h e b ou n d a r y
3 . T h e To t al i nt e r n a l r e fl e c t i o n c a n t a ke s p l a c e ( a) I f t h e wave tr ave l s f r o m R ar e r t o D e n s e r m e d i u m ( b ) I f t h e wave tr ave l s f r o m R ar e r t o R ar e r m e d i u m ( c ) I f t h e wave tr ave l s f r o m D e n s e r to R ar e r m e d i u m ( d ) I f t h e wave tr ave l s f r o m D e n s e r to D e n s e r m e d i u m
4 . . E l e c t ri c an d m ag n e t i c fi e l d s w h i ch ar e p ar a l l e l ( a) C o n s t i t u te a p owe r fl ow ( b ) D o n ot c on s ti t u t e a ny p owe r fl ow ( c ) C o n s t i t u te i n fi n i t e p owe r fl ow ( d ) C o n s t i t u te u n i t m a gn i t u d e p owe r fl ow
5 . A u n i f o r m p l an e wave t r ave l i n g i n ai r w i t h a p owe r d e n s i ty of 2W / m 2 . T h e n t h e e l e c t ri c fi e l d s t r e n gt h o f t h e wave i s ( a) η 0 / 2 ( b ) 2 s q r t ( η 0 ) ( c ) S q r t ( 2 η 0 ) ( d ) 2 η 0
6 . T h e p r op a ga t i on c on s ta nt r f o r a wave w i t ho u t a t te nu a t i on ( a) γ = I / j β ( b ) I γ I = β ( c ) γ = ss ( d ) I γ I = j ss
7 . Fo r a z d i r e c te d gu i d e d wave b e twe e n p ar a l l e l c o n d u c t i n g p l an e s , t h e s t an d i n g wave d i s tr i b u t i o n ac ro s s th e gu i d e i n ( a) Z - d i re c ti o n ( b ) Y a n d Z d i re c ti o n s ( c ) Y - d i r e c t i on ( d ) X - d i r e c t i o n
8 . C u t - o ff f r e qu e n c y i s a f r e q u e n c y b e l ow w h i ch ( a) β = 0 ( b ) β = α = 0 ( c ) Z g = 0 ( d ) α = 0
9 . At te nu a t i on f ac to r f o r a T E M wave i s p r o p or t i o n al to ( a) Fr e q u e n c y ( b ) Z 0 ( c ) C o n d u c t i vi ty ( d ) S q r t( Fr e q u e n c y )
1 0. W h e n f re qu e n c y ap p r o ach i n g i n fi n i ty, th e wave i m p e d an c e o f T E an d T M wave s b e twe e n p ar al l e l c o n d u c t i n g p l at e s ( a) A p p r oa ch e s z e r o ( b ) A p p r oa ch e s 1 / η ( c ) A p p r oa ch e s η ( d ) A p p r oa ch e s i n fi n i ty
1 1. I n a c oa x i al t ra n s m i s s i on l i n e e l e c tr i c an d m ag n e t i c fi e l d s a re ( a) N o t C o n fi n e d t o d i e l e c t r i c me d i u m ( b ) C o n fi n e d t o a d i e l e c tr i c m e d i u m ( c ) C o n fi n e d t o t h e o u t e r c o n d u c t or ( d ) C o n fi n e d t o t h e i n n e r c on d u c to r
1 2. I n a t r a n s m i s s i o n l i n e w h e n t e r m i n at i o n i m p e d a n c e i s e q u a l t o ch ar a c t e ri s ti c i m p e d a n c e of th a t l i n e t h e n th e r e fl e c t i o n c o e ffi c i e nt i s
( a) U n i ty ( b ) E q u a l t o t ra n s m i s s i on c o e ffi c i e nt ( c ) Z e ro ( d ) I n fi n i ty
1 3. Fo r a l o s s l e s s l i n e t h e l i n e ch ar a c t e r i s t i c s r e p e at f or e ve r y ( a) 3 λ / 4 ( b ) λ / 2 ( c ) λ ( d ) λ / 4
1 4. H y s t e r e s i s an d e d d y c u r r e nt l o s s e s i n l o ad i n g c oi l s l e ad s t o ( a) I n c r e a s e i n R
( b ) I n c r e a s e i n L ( c ) D e c r e a s e i n L ( d ) D e c r e a s e i n R
1 5. A t r a n s m i s s i o n l i n e op e ra t i n g at 2 M H z h as vol t ag e re fl e c t i on c o e ffi c i e nt o f 0 . 5 . t h e n V S W R i s ( a) 2 ( b ) 4 ( c ) 3 ( d ) 1
1 6. T h e i n c i d e nt p owe r i s f u l l y ab s or b e d by t h e l o ad i f ( a) Z L = 0 ( b ) Z L = Z 0 ( c ) Z L = Z 0 ( d ) Z L = i n fi n i ty
1 7. A λ / 4 l i n e m ay b e c on s i d e re d as ( a) Vo l t ag e i nve r t e r ( b ) C u r r e nt i nve r t e r ( c ) Powe r i nve r t e r ( d ) I m p e d an c e i nve r t e r
1 8. A c om p l e t e r e vo l u t i on ar o u n d t h e s m i t h ch ar t r e p r e s e nt s a d i s t an c e o f ( a) λ / 2 o n t h e l i n e ( b ) λ / 4 o n t h e l i n e ( c ) λ o n t h e l i n e ( d ) λ / 8 o n t h e l i n e
1 9. A s h or t c i r c u i t e d s t u b i s or d i n a ri l y p re f e r re d t o an op e n c i r c u i t e d s t u b b e c a u s e ( a) I t s l e n gt h i s s m a l l . ( b ) I t h a s h i gh e r l os s o f e n e r g y d u e to r a d i at i o n ( c ) I t h a s c om p l e te l os s o f e n e r gy d u e t o ra d i a ti o n
( d ) I t h a s l owe r l o s s of e n e r g y d u e t o r a di a t i on
2 0. A l o s s l e s s l i n e h a s Z 0 = 50 o h m s . I f i t i s c on n e c t e d t o a l oa d o f Z L = ( 50 /( 2 +j 2) ) o h m s . T h e n th e n or m a l i z e d a d m i tt a n c e i s ( a) 1 /( 2 +j 2 ) ( b ) 1 /( 2 - j 2 ) ( c ) ( 2- j 2 ) ( d ) ( 2+ j 2 )
AACBB BBDAD CBCBA CBDADD
( a) A m p e r e / m ( b ) a m p e r e /m 3 ( c ) A m p e r e ( d ) A m p e r e / m 2
2 . A s p e r t h e b ou n d a r y c o n d i ti o n ( a) T h e t an g e nti a l c om p o n e nt s o f E i s c ont i nu ou s a c ro s s t h e b o u n d a ry. ( b ) T h e n or m a l c o m p o n e nt s of E i s c o nt i nu o u s ac r o s s th e b o u n d ar y. ( c ) T h e t an g e nti a l c om p o n e nt s o f D i s c o nt i nu o u s ac r o s s th e b o u n d ar y. ( d ) T h e n or m a l c o m p o n e nt s of H i s c o nti nu o u s a c r o s s t h e b ou n d a r y
3 . T h e To t al i nt e r n a l r e fl e c t i o n c a n t a ke s p l a c e ( a) I f t h e wave tr ave l s f r o m R ar e r t o D e n s e r m e d i u m ( b ) I f t h e wave tr ave l s f r o m R ar e r t o R ar e r m e d i u m ( c ) I f t h e wave tr ave l s f r o m D e n s e r to R ar e r m e d i u m ( d ) I f t h e wave tr ave l s f r o m D e n s e r to D e n s e r m e d i u m
4 . . E l e c t ri c an d m ag n e t i c fi e l d s w h i ch ar e p ar a l l e l ( a) C o n s t i t u te a p owe r fl ow ( b ) D o n ot c on s ti t u t e a ny p owe r fl ow ( c ) C o n s t i t u te i n fi n i t e p owe r fl ow ( d ) C o n s t i t u te u n i t m a gn i t u d e p owe r fl ow
5 . A u n i f o r m p l an e wave t r ave l i n g i n ai r w i t h a p owe r d e n s i ty of 2W / m 2 . T h e n t h e e l e c t ri c fi e l d s t r e n gt h o f t h e wave i s ( a) η 0 / 2 ( b ) 2 s q r t ( η 0 ) ( c ) S q r t ( 2 η 0 ) ( d ) 2 η 0
6 . T h e p r op a ga t i on c on s ta nt r f o r a wave w i t ho u t a t te nu a t i on ( a) γ = I / j β ( b ) I γ I = β ( c ) γ = ss ( d ) I γ I = j ss
7 . Fo r a z d i r e c te d gu i d e d wave b e twe e n p ar a l l e l c o n d u c t i n g p l an e s , t h e s t an d i n g wave d i s tr i b u t i o n ac ro s s th e gu i d e i n ( a) Z - d i re c ti o n ( b ) Y a n d Z d i re c ti o n s ( c ) Y - d i r e c t i on ( d ) X - d i r e c t i o n
8 . C u t - o ff f r e qu e n c y i s a f r e q u e n c y b e l ow w h i ch ( a) β = 0 ( b ) β = α = 0 ( c ) Z g = 0 ( d ) α = 0
9 . At te nu a t i on f ac to r f o r a T E M wave i s p r o p or t i o n al to ( a) Fr e q u e n c y ( b ) Z 0 ( c ) C o n d u c t i vi ty ( d ) S q r t( Fr e q u e n c y )
1 0. W h e n f re qu e n c y ap p r o ach i n g i n fi n i ty, th e wave i m p e d an c e o f T E an d T M wave s b e twe e n p ar al l e l c o n d u c t i n g p l at e s ( a) A p p r oa ch e s z e r o ( b ) A p p r oa ch e s 1 / η ( c ) A p p r oa ch e s η ( d ) A p p r oa ch e s i n fi n i ty
1 1. I n a c oa x i al t ra n s m i s s i on l i n e e l e c tr i c an d m ag n e t i c fi e l d s a re ( a) N o t C o n fi n e d t o d i e l e c t r i c me d i u m ( b ) C o n fi n e d t o a d i e l e c tr i c m e d i u m ( c ) C o n fi n e d t o t h e o u t e r c o n d u c t or ( d ) C o n fi n e d t o t h e i n n e r c on d u c to r
1 2. I n a t r a n s m i s s i o n l i n e w h e n t e r m i n at i o n i m p e d a n c e i s e q u a l t o ch ar a c t e ri s ti c i m p e d a n c e of th a t l i n e t h e n th e r e fl e c t i o n c o e ffi c i e nt i s
( a) U n i ty ( b ) E q u a l t o t ra n s m i s s i on c o e ffi c i e nt ( c ) Z e ro ( d ) I n fi n i ty
1 3. Fo r a l o s s l e s s l i n e t h e l i n e ch ar a c t e r i s t i c s r e p e at f or e ve r y ( a) 3 λ / 4 ( b ) λ / 2 ( c ) λ ( d ) λ / 4
1 4. H y s t e r e s i s an d e d d y c u r r e nt l o s s e s i n l o ad i n g c oi l s l e ad s t o ( a) I n c r e a s e i n R
( b ) I n c r e a s e i n L ( c ) D e c r e a s e i n L ( d ) D e c r e a s e i n R
1 5. A t r a n s m i s s i o n l i n e op e ra t i n g at 2 M H z h as vol t ag e re fl e c t i on c o e ffi c i e nt o f 0 . 5 . t h e n V S W R i s ( a) 2 ( b ) 4 ( c ) 3 ( d ) 1
1 6. T h e i n c i d e nt p owe r i s f u l l y ab s or b e d by t h e l o ad i f ( a) Z L = 0 ( b ) Z L = Z 0 ( c ) Z L = Z 0 ( d ) Z L = i n fi n i ty
1 7. A λ / 4 l i n e m ay b e c on s i d e re d as ( a) Vo l t ag e i nve r t e r ( b ) C u r r e nt i nve r t e r ( c ) Powe r i nve r t e r ( d ) I m p e d an c e i nve r t e r
1 8. A c om p l e t e r e vo l u t i on ar o u n d t h e s m i t h ch ar t r e p r e s e nt s a d i s t an c e o f ( a) λ / 2 o n t h e l i n e ( b ) λ / 4 o n t h e l i n e ( c ) λ o n t h e l i n e ( d ) λ / 8 o n t h e l i n e
1 9. A s h or t c i r c u i t e d s t u b i s or d i n a ri l y p re f e r re d t o an op e n c i r c u i t e d s t u b b e c a u s e ( a) I t s l e n gt h i s s m a l l . ( b ) I t h a s h i gh e r l os s o f e n e r g y d u e to r a d i at i o n ( c ) I t h a s c om p l e te l os s o f e n e r gy d u e t o ra d i a ti o n
( d ) I t h a s l owe r l o s s of e n e r g y d u e t o r a di a t i on
2 0. A l o s s l e s s l i n e h a s Z 0 = 50 o h m s . I f i t i s c on n e c t e d t o a l oa d o f Z L = ( 50 /( 2 +j 2) ) o h m s . T h e n th e n or m a l i z e d a d m i tt a n c e i s ( a) 1 /( 2 +j 2 ) ( b ) 1 /( 2 - j 2 ) ( c ) ( 2- j 2 ) ( d ) ( 2+ j 2 )
AACBB BBDAD CBCBA CBDADD
Sunday, April 13, 2008
EMWT ONLINE 1
1 . Fo r n o r m al i n c i d e n c e of a wave o n d i e l e c tr i c - c o n d u c t or i nt e r f a c e t h e m ag n i t u d e o f r e fl e c ti o n c o e ffi c i e nt i s ( a) Z e ro ( b ) U n i ty ( c ) I n b e twe e n 0 a n d 1 ( d ) I n fi n i ty
2 . T h e d i m e n s i o n o f a r e fl e c ti o n c o e ffi c i e nt i s ( a) A / m ( b ) V / A ( c ) V / m ( d ) N o u n i t
3 . . B r e w s t e r a n gl e Θ i s gi ve n by ( a) Tan Θ =S q r t ( ∈ 1 / ( ∈ 1 + ∈ 2 ) ) ( b ) Tan Θ =S q r t ( ∈ 2 / ∈ 1 ) ( c ) Tan Θ =S q r t (( ∈ 1 + ∈ 2 ) / ∈ 1 ) ( d ) Tan Θ =S q r t ( ∈ 1 / ∈ 2 )
4 . . E l e c t ri c an d m ag n e t i c fi e l d s w h i ch ar e p ar a l l e l ( a) C o n s t i t u te i n fi n i t e p owe r fl ow ( b ) C o n s t i t u te u n i t m a gn i t u d e p owe r fl ow ( c ) D o n ot c on s ti t u t e a ny p owe r fl ow ( d ) C o n s t i t u te a p owe r fl ow
5 . T h e m ag n e t i c fi e l d a t t h e s u r f a c e o f a g o o d c on d u c to r i s 2 A /m . T h e f r e q u e n c y of t h e fi e l d i s 6 00 M H z . T h e s u rf ac e r m s c u rr e nt d e n s i ty i s ( a) 2 A / m 2 ( b ) 1 /2 A / m ( c ) 2 A / m ( d ) 1 /2 A / m 2
6 . At t h e s u rf ac e o f a p e r f e c t c o n d u c t or ( a) Tan g e nt ia l c om p o n e nt s o f E i s z e r o ( b ) N o rm a l c om p o n e nt s o f D i s z e ro ( c ) Tan g e nt ia l c om p o n e nt s o f H i s z e r o ( d ) N o rm a l c om p o n e nt s o f E i s z e r o
7 . T h e e q u i p h as e s u r f a c e s p r og r e s s e s a l on g t h e g u i d e w i t h a ve l o c i ty ( a) ss / ω ( b ) ω / ss ( c ) d ω / d ss ( d ) L i ght ve l o c i ty
8 . C u t - o ff f r e qu e n c y i s a f r e q u e n c y b e l ow w h i ch ( a) Z g = 0 ( b ) β = 0 ( c ) α = 0 ( d ) β = α = 0
9 . T h e at t e nu at i o n c o n s t a nt f or a T E M m o d e of p r op a ga t i on i s ( a) L ow ( b ) Z e ro ( c ) H i g h ( d ) I n fi n i ty
1 0. W h e n f re qu e n c y ap p r o ach i n g i n fi n i ty, th e wave i m p e d an c e o f T E an d T M wave s b e twe e n p ar a ll e l c o n d u c t i n g p l at e s ( a) A p p r oa ch e s η ( b ) A p p r oa ch e s i n fi n i ty ( c ) A p p r oa ch e s 1 / η ( d ) A p p r oa ch e s z e r o
1 1. I n a c oa x i al t ra n s m i s s i on l i n e e l e c tr i c an d m ag n e t i c fi e l d s a re ( a) N o t C o n fi n e d t o d i e l e c t r i c me d i u m ( b ) C o n fi n e d t o t h e o u t e r c o n d u c t or ( c ) C o n fi n e d t o a d i e l e c tr i c m e d i u m ( d ) C o n fi n e d t o t h e i n n e r c on d u c to r
1 2. I n a tr a n s m i s s i o n l i n e t h e vol t a ge a n d c u r r e nt s t an d i n g wave s a re ( a) 2 70 0 o u t of p h a s e a l on g t h e l i n e ( b ) 0 0 o u t of p h a s e a l on g t h e l i n e ( c ) 9 0 0 o u t of p h a s e a l on g t h e l i n e ( d ) 1 80 0 o u t of p h a s e a l on g t h e l i n e
1 3. Fo r a l ow l o s s l i n e t h e p h a s e ve l o c i ty i s ( a) A p p r ox i m a te l y c on s ta nt ( b ) I n c r e a s e s w i t h f re qu e n c y ( c ) D e c r e a s e s w i t h f r e q u e n c y ( d ) I n c r e a s e s w i t h s qu a r e o f f re qu e n c y
1 4. I n a c ont i nu ou s l y l oa d e d c ab l e ( a) α d e c r e a s e s u n i f o rm l y w i t h i n c r e a s e i n f r e q u e n c y ( b ) α i n c r e a s e s u n i f or m l y w i th i n c r e as e i n f r e q u e n c y ( c ) α i n c r e a s e s u n i f or m l y w i th d e c r e a s e i n f r e q u e n c y ( d ) α d e c r e a s e s u n i f o rm l y w i t h d e c r e a s e i n f r e q u e n c y
1 5. A t ra n s m i s s i on l i n e op e r at i n g a t 1 G H z h as L = 1 m i c r o h e n r y / m , C = 1p F / m , R = G = 0. T h e n i t s ch ar a c te ri s ti c a d m i tt a n c e i s ( a) 0 . 1 m h os ( b ) 1 0 m h os ( c ) 0 . 01 m h o s ( d ) 0 . 00 1 m h os
1 6. T h e m ax i mu m p owe r t r an s f e r i s p os s i b l e w h e n ( a) Tra n s m i s s i on l i n e i s m at ch e d w i t h t h e l o ad ( b ) Tra n s m i s s i on l i n e i s s h o rt c i rc u i te d ( c ) Tra n s m i s s i on l i n e i s op e n c i r c u i t e d ( d ) Tra n s m i s s i on l i n e i s c on n e c t e d t o a l oa d w h i ch i s n ot e qu a l t o Z 0
1 7. w h e n th e l e n g t h o f a l i n e i s a n i nt e g ra l mu l t i p l e s of λ / 2 th e n Ta n β l i s e q u a l t o ( a) T wo ( b ) Z e ro ( c ) I n fi n i ty ( d ) U n i ty
1 8. T h e u p p e r h a l f o f th e s m i t h ch a r t r e p re s e nt s ( a) r ( b ) ± j x ( c ) - j x ( d ) + j x
1 9. I n a s t u b m at ch i n g i t i s m o re c o nve n i e nt t o s o l ve t h e p r o b l e m u s i n g ( a) R e s i s t a n c e ( b ) R e ac ta n c e ( c ) A d m i t t an c e ( d ) I m p e d an c e
2 0. Fo r a q u ar t e r wave t r an s f o r m e r β l i s e q u a l t o ( a) π / 2 ( b ) π ( c ) 2 π ( d ) π / 4
BDBCC ABBBA CCABD ABDCA
2 . T h e d i m e n s i o n o f a r e fl e c ti o n c o e ffi c i e nt i s ( a) A / m ( b ) V / A ( c ) V / m ( d ) N o u n i t
3 . . B r e w s t e r a n gl e Θ i s gi ve n by ( a) Tan Θ =S q r t ( ∈ 1 / ( ∈ 1 + ∈ 2 ) ) ( b ) Tan Θ =S q r t ( ∈ 2 / ∈ 1 ) ( c ) Tan Θ =S q r t (( ∈ 1 + ∈ 2 ) / ∈ 1 ) ( d ) Tan Θ =S q r t ( ∈ 1 / ∈ 2 )
4 . . E l e c t ri c an d m ag n e t i c fi e l d s w h i ch ar e p ar a l l e l ( a) C o n s t i t u te i n fi n i t e p owe r fl ow ( b ) C o n s t i t u te u n i t m a gn i t u d e p owe r fl ow ( c ) D o n ot c on s ti t u t e a ny p owe r fl ow ( d ) C o n s t i t u te a p owe r fl ow
5 . T h e m ag n e t i c fi e l d a t t h e s u r f a c e o f a g o o d c on d u c to r i s 2 A /m . T h e f r e q u e n c y of t h e fi e l d i s 6 00 M H z . T h e s u rf ac e r m s c u rr e nt d e n s i ty i s ( a) 2 A / m 2 ( b ) 1 /2 A / m ( c ) 2 A / m ( d ) 1 /2 A / m 2
6 . At t h e s u rf ac e o f a p e r f e c t c o n d u c t or ( a) Tan g e nt ia l c om p o n e nt s o f E i s z e r o ( b ) N o rm a l c om p o n e nt s o f D i s z e ro ( c ) Tan g e nt ia l c om p o n e nt s o f H i s z e r o ( d ) N o rm a l c om p o n e nt s o f E i s z e r o
7 . T h e e q u i p h as e s u r f a c e s p r og r e s s e s a l on g t h e g u i d e w i t h a ve l o c i ty ( a) ss / ω ( b ) ω / ss ( c ) d ω / d ss ( d ) L i ght ve l o c i ty
8 . C u t - o ff f r e qu e n c y i s a f r e q u e n c y b e l ow w h i ch ( a) Z g = 0 ( b ) β = 0 ( c ) α = 0 ( d ) β = α = 0
9 . T h e at t e nu at i o n c o n s t a nt f or a T E M m o d e of p r op a ga t i on i s ( a) L ow ( b ) Z e ro ( c ) H i g h ( d ) I n fi n i ty
1 0. W h e n f re qu e n c y ap p r o ach i n g i n fi n i ty, th e wave i m p e d an c e o f T E an d T M wave s b e twe e n p ar a ll e l c o n d u c t i n g p l at e s ( a) A p p r oa ch e s η ( b ) A p p r oa ch e s i n fi n i ty ( c ) A p p r oa ch e s 1 / η ( d ) A p p r oa ch e s z e r o
1 1. I n a c oa x i al t ra n s m i s s i on l i n e e l e c tr i c an d m ag n e t i c fi e l d s a re ( a) N o t C o n fi n e d t o d i e l e c t r i c me d i u m ( b ) C o n fi n e d t o t h e o u t e r c o n d u c t or ( c ) C o n fi n e d t o a d i e l e c tr i c m e d i u m ( d ) C o n fi n e d t o t h e i n n e r c on d u c to r
1 2. I n a tr a n s m i s s i o n l i n e t h e vol t a ge a n d c u r r e nt s t an d i n g wave s a re ( a) 2 70 0 o u t of p h a s e a l on g t h e l i n e ( b ) 0 0 o u t of p h a s e a l on g t h e l i n e ( c ) 9 0 0 o u t of p h a s e a l on g t h e l i n e ( d ) 1 80 0 o u t of p h a s e a l on g t h e l i n e
1 3. Fo r a l ow l o s s l i n e t h e p h a s e ve l o c i ty i s ( a) A p p r ox i m a te l y c on s ta nt ( b ) I n c r e a s e s w i t h f re qu e n c y ( c ) D e c r e a s e s w i t h f r e q u e n c y ( d ) I n c r e a s e s w i t h s qu a r e o f f re qu e n c y
1 4. I n a c ont i nu ou s l y l oa d e d c ab l e ( a) α d e c r e a s e s u n i f o rm l y w i t h i n c r e a s e i n f r e q u e n c y ( b ) α i n c r e a s e s u n i f or m l y w i th i n c r e as e i n f r e q u e n c y ( c ) α i n c r e a s e s u n i f or m l y w i th d e c r e a s e i n f r e q u e n c y ( d ) α d e c r e a s e s u n i f o rm l y w i t h d e c r e a s e i n f r e q u e n c y
1 5. A t ra n s m i s s i on l i n e op e r at i n g a t 1 G H z h as L = 1 m i c r o h e n r y / m , C = 1p F / m , R = G = 0. T h e n i t s ch ar a c te ri s ti c a d m i tt a n c e i s ( a) 0 . 1 m h os ( b ) 1 0 m h os ( c ) 0 . 01 m h o s ( d ) 0 . 00 1 m h os
1 6. T h e m ax i mu m p owe r t r an s f e r i s p os s i b l e w h e n ( a) Tra n s m i s s i on l i n e i s m at ch e d w i t h t h e l o ad ( b ) Tra n s m i s s i on l i n e i s s h o rt c i rc u i te d ( c ) Tra n s m i s s i on l i n e i s op e n c i r c u i t e d ( d ) Tra n s m i s s i on l i n e i s c on n e c t e d t o a l oa d w h i ch i s n ot e qu a l t o Z 0
1 7. w h e n th e l e n g t h o f a l i n e i s a n i nt e g ra l mu l t i p l e s of λ / 2 th e n Ta n β l i s e q u a l t o ( a) T wo ( b ) Z e ro ( c ) I n fi n i ty ( d ) U n i ty
1 8. T h e u p p e r h a l f o f th e s m i t h ch a r t r e p re s e nt s ( a) r ( b ) ± j x ( c ) - j x ( d ) + j x
1 9. I n a s t u b m at ch i n g i t i s m o re c o nve n i e nt t o s o l ve t h e p r o b l e m u s i n g ( a) R e s i s t a n c e ( b ) R e ac ta n c e ( c ) A d m i t t an c e ( d ) I m p e d an c e
2 0. Fo r a q u ar t e r wave t r an s f o r m e r β l i s e q u a l t o ( a) π / 2 ( b ) π ( c ) 2 π ( d ) π / 4
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