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