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




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