EMWT ONLINE 11

1 . . T h e m ag n i t u d e o f th e E a t t h e d i e l e c t r i c - c o n d u c t o r i nt e r f a c e
( a) T w i c e t o t h at o f th e i n c i d e nt fi e l d ( b ) Z e ro ( c ) I n fi n i ty ( d ) H a l f t o t h at o f th e i n c i d e nt fi e l d

2 . T h e r e f r ac t i ve i n d e x of a d i e l e c t r i c m at e r i al
( a) S q r t( ∈ 0 ∈ r ) ( b ) S q r t( ∈ 0 ) ( c ) S q r t( ∈ r ) ( d ) S q r t( ∈ 0 / ∈ r )

3 . D u r i n g to t al i nt e r n a l r e fl e c t i o n wave u n d e r g o e s
( a) Po l ar i z a t io n ch a n g e ( b ) A p h a s e ch an g e ( c ) N o ch a n ge i n t h e p h a s e ( d ) M a gn i t u d e ch an g e

4 . At ve r y h i gh f r e q u e n c y t h e am o u nt of p owe r p e n e t r at i o n i nt o th e c o n d u c t i n g m e d i u m (
a) L ow ( b ) Ve ry l ow ( c ) H i g h ( d ) Ve ry h i gh

5 . I n a re gi o n E = 1 00 ( j a x + 2 a y - j a z ) e j ω t a n d H = ( - a x + j a y + a z ) e j ω t . T h e n ave r ag e p owe r fl ow d e n s i ty i s
( a) - 1 50 ( a x + a z ) ( b ) 5 0( a x + a z ) ( c ) 1 50 ( a x + a z ) ( d ) - 5 0( a x + a z )

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 l i n e a rl y
( c ) D e c r e a s e s e x p o ne nt i a l l 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 p r op a ga t i n g ve l o c i ty o f T E wave s
( a) D e p e n d s o n f r e q u e n c y ( b ) D e p e n d s o n s q u ar e of t h e f re qu e n c y ( c ) I n d e p e n d e nt of f r e q u e n c y ( d ) Va r i e s i nve r s e l y w i th f r e q u e n c y

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 = α = 0 ( b ) Z g = 0 ( c ) α = 0 ( d ) β = 0

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 ) T E m o d e ( d ) P r i n c i p a l wave

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 x / H y ( c ) - E x / H y ( d ) E y / H x

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 ) Z e ro d i s ta n c e ( c ) U n i f o r m d i s t a n c e ( d ) N o n u n i f o r m d i s t an c e

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) I n fi n i ty ( b ) Z e ro ( c ) 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 ( d ) U 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) λ / 4 ( b ) λ ( c ) λ / 2 ( d ) 3 λ / 4

1 4. B y i n s e r t i n g i n du c ta n c e i n s e ri e s w i t h t h e l i n e t o i n c r e a s e th e i n d u c t a nc e i s c a l l e d
( a) O p e n c i rc u i t ( b ) U n l o ad i n g ( c ) Fe e d b ack ( d ) L oa d i n g



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 ) 4 00 O h m s ( c ) 5 0 Oh 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 = Z 0 ( b ) Z L = 0 ( c ) Z L = i n fi n i ty ( d ) Z L  = Z 0


1 7. W h i ch o f t h e f o l l ow i n g i s a on e t o on e t ra n s f o r m e r
( a) λ / 8 l i n e ( b ) λ / 2 l i n e ( c ) λ / 4 l i n e ( d ) λ l i n e

1 8. T h e s m i t h ch a rt c an b e u s e d a s
( a) I m p e d an c e ch ar t a s we l l a s A d m i t t a n c e ch a r t ( b ) I m p e d an c e ch ar t o n l y ( c ) A d m i t t an c e ch ar t o n l y ( d ) N o rm a l i z e d ad m i t t an c e ch a r t on l y

1 9. A s tu b w i t h a s h o r t c i r c u i t e d l o ad off e r s ( a) P u r e re s i s t an c e ( b ) C a p ac i ti ve r e a c t a n c e ( c ) I m p e d an c e ( d ) I n d u c t i ve r e a c t an c e

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) 7 5 oh m s ( b ) 2 5 oh m s ( c ) 1 00 o h m s ( d ) 5 0 oh m s

BCBBC CADAB CBCDA ABADD