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

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