EMWT ONLINE 12

1 . At t h e d i e l e c t ri c c on d u c t o r i nte rf ac e t h e wave
( a) 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 ( b ) N o t r an s m i s s i on an d n o re fl e c t i on ta ke p l a c e . ( c ) C o m p l e t e t r an s m i s s i o n t ake s p l ac e ( d ) B o t h r e fl e c t i o n a n d t r an s mi s s i o n t ake s p l ac e

2 . Fo r n o r m al i n c i d e n c e , th e an g l e of i n c i d e n c e i s
( a) 0 0 ( b ) 1 80 0 ( c ) 4 5 0 ( d ) 9 0 0

3 . T h e an o t h e r n a m e o f B r e w s t e r a n gl e i s
( a) A n g l e o f r e fl e c ti o n ( b ) N o n p o l ar i z i n g a n gl e ( c ) A n g l e o f t r an s m i s s i o n ( d ) Po l ar i z i n g a n gl e

4 . T h e s u r f a c e r e s i s t an c e ( a) I n c r e a s e s w i t h c on d u c t i v i ty ( b ) D e c r e a s e s w i t h f r e q u 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 an d I n c r e as e s w i th c o n d u c t i vi ty ( d ) I n c r e a s e s w i t h f re q u e n c y

5 . A u n i f o r m p l an e wave tr ave l i n g i n a d i e l e c t r i c of re f r ac t i ve i n d e x 2 i s i n c i d e nt at t h e d i e l e c tr i c a i r s u r f a c e . T h e n th e c r i t i c a l a ng l e at t h e i nte rf a c e i s ( a) S i n - 1 ( 1 √ 2 ) ( b ) S i n - 1 ( √2 ) ( c ) Tan - 1 ( 1 √ 2 ) ( d ) S i n - 1 ( 1 2 )

6 . I f t h e d i s t a n c e b e twe e n t h e p l an e s i s in fi n i t e t h e n t h e wave i n t h a t d i r e c t i on i s
( a) I n c r e a s e s l i n e a r l y ( b ) N o n u n i f o r m ( c ) I n c r e a s e s e x p o n e nti a l l y ( d ) U n i f o r m

7 . Fo r a z d i r e c t e d T E wave
( a) H z = E z = 0 ( b ) E z = 0 ( c ) E = 0 ( d ) H z = 0

8 . O th e r n am e of T M wave i s
( a) E wave ( b ) H wave ( c ) U n i f o r m p l a ne wave ( d ) E & H wave

9 . Fo r a T E M wave
( a) H z = E z = 0 ( b ) E z = 0 ( c ) E z = 0 , H z = 0 ( d ) H z = 0

1 0. C o n s i d e r a wave of 3 G H z p r o p ag at i n g i n p a r al l e l c o n d u c t i n g p l at e s s e p a r at e d by 3 c m . T h e n t h e λ c i s
( a) 1 . 5 c m ( b ) 3 c m ( c ) 1 /3 c m ( d ) 6 c m

1 1. I n s ol v i n g t r an s m i s s i o n l i n e p r o b l e m s we u s e t h e f o l l ow i n g c i r c u i t q u ant i t i e s
( a) V a n d I ( b ) E an d H ( c ) D a n d B ( d ) J a n d 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) Z e ro ( b ) U n i ty ( 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 ) 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 ) D e c r e a s e i n L ( c ) D e c r e a s e i n R ( d ) I n c r e a s e i n L

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 ro f a r ad s /K m . I f R & G ar e n e gl i g i b l e , t h e n ch a r ac 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 ) 2 00 O h m s ( d ) 5 0 Oh m s

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) C a p ac i ti ve ( b ) C o m p l e x q u ant i ty ( c ) R e s i s t i ve ( d ) I n d u c t i ve

1 7. A λ / 8 l i n e m ay b e u s e d to t r a n s f o rm any r e s i s ta n c e t o an i m p e d an c e w i t h a m a g n i tu d e e q u al t o ( a) 1 / R 0 o f t h e l i n e
( b ) R 0 o f t h e l i n e ( c ) Z 0 o f t h e li n e ( d ) 1 /Z 0 o f t h e l i n e

1 8. I n a tr a n s m i s s i o n l i n e at a p oi nt o f Z m i n t h e r e i s a ( a) I m a x ( b ) I m i n ( c ) V m i n ( d ) V m a x

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) I n d u c t i ve r e a c t an c e ( b ) P u r e re s i s t an c e ( c ) I m p e d an c e ( d ) C a p ac i ti ve r e a c t a n 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) 1 / 2 ( b ) 4 ( c ) 1 /3 ( d ) 2
A A D D D D B D A D A A B A A A B C A D