2 AC ONLINE 2-2

1 . T h e S i gn a l t o N o i s e o f F m a t m o d u l a t i on i n d e x = 5 i s f a c t or of S /N of A M ( a) 7 0 ( b ) 8 1 ( c ) 7 5 ( d ) 5 7

2 . T h e S i gn a l t o N o i s e r a t i o of V S B - S C s ch e m e i s ( a) 3 ( b ) z e r o ( c ) 2 ( d) 1

3 . I n P M , t h e p owe r s p e c t r a l d e n s i ty o f t h e O/ P n o i s e , va r i e s w i th f r e q u e n c y a s ( a) H y p e r b o l a ( b ) Pa ra b o l a ( c ) U n i f o r m ( d ) c i r c l e

4 . I n F M , t h e p owe r s p e c t r al d e n s i ty o f t h e O / P n o i s e , va ri e s w i t h f re qu e n c y a s ( a) U n i f o r m ( b ) H y p e r b o l a ( c ) Pa ra b o l a ( d ) c i r c l e

5 . H a rm o n i c ge n e r a t or i s o p e r at e d as a a m p l i fi e r ( a) A B ( b ) B ( c ) C ( d ) A

6 . O n e o f t h e f ol l ow i n g i s u s e d i n ra d i o t e l e p h o n e t r an s m i tt e r s ( a) Va c u u m Tu b e ( b ) VODA S ( c ) Tra n s i s t o r ( d ) F E T

7 . A d e vi c e t h a t re d u c e s th e g ai n o f A . F . a m p l i fi e r w h e n t h e i n p u t e x c e e d s p re d e t e r m i n e d va l u e i s c a l l e d ( a) D i s c r i m i n a to r ( b ) Pe a k c l i p p e r ( c ) e ch o s u p p r e s s or ( d ) D e t e c t o r

8 . M o s t o f t h e p owe r i n A M s i gn a l l i e s i n i ts ( a) U S B ( b ) C a r ri e r ( c ) L S B ( d ) B o t h U S B a n d L S B

9 . T h e r an g e o f F . M . t r an s m i t t e r wo r ki n g i n t h e U H F ra n g e i s ( a) ve r y l ar g e ( b ) l a rg e ( c ) l i n e of s i g ht d i s ta n c e ( d ) S m a l l

1 0. T h e p r e d i s t o rt e r i n A r m s t r on g F . M ge n e ra t i on i s n o t h i n g b u t ( a) I nt e g ra t or ( b ) At te nu a t or ( c ) R e c t i fi e r ( d ) D i ff e r e nt i at o r

11. A l l c om m e r c i a l r e c e i ve r s e m p l oy I F b e twe e n ( a) 2 00 t o 3 00 K H z ( b ) 7 40 t o 8 40 K H z ( c ) 4 55 t o 4 65 K H z ( d ) 1 2 to 1 3 K H

1 2. T h e s e l e c ti v i ty of a T R F r e c e i ve r i s ( a) l ow ( b ) t o o h i gh t o r e d u c e fi d e l i ty ( c ) ve r yl ow ( d ) m e d i u m

1 3. T h e l o c al Os c i l l at o r of a s u p e rh e t e r o d y n e r e c e i ve r w i l l b e t u n e d t o a f r e q u e n c y ( a) l owe r t h an s i gn a l f r e q u e n c y ( b ) S i g n al f r e qu e n c y + I F ( c ) O f t h e s i gn a l ( d ) s i g n al f r e q u e n c y - I F

1 4. T h e f o l l ow i n g i s n ot o n e of th e c o m m on s t ag e f or A M & F M re c e i ve r s ( a) l i m i t e r ( b ) m i x e ( c ) r at i o d e t e c t o r ( d ) I F am p l i fi e r

1 5. T h e l o c al os c i l l at o r of a b r oa d c a s t r e c e i ve r i s t u n e d t o s f r e q u e n c y h i g h e r t h an t h e i n c o m i n g f r e q u e n c y ( a) t o al l ow a d e q u at e f r e q u e n c y c ove ra g e w i t h o u t s w i t ch i n g ( b ) t o p e r m i t e a s i e r t r a cki n g ( c ) o th e rw i s e i nt e r m e d i a te f r e q u e n c y c an n o t b e p ro d u c e d ( d ) t o al l ow t h e i m ag e f re qu e n c y r e j e c t i o n

1 6. A b as e b an d s i g n a l ba n d l i m i t e d t o 5 K H z i s t o b e re c on s tr u c t e d f r o m i ts s am p l e s . T h e m i n i mu m p a s s b a n d w i d t h o f t h e re c on s t r u c t i o n fi l t e r s h o u l d b e ( a) 1 0 K H z ( b ) 2 0 K H z ( c ) 2 . 5 K H z ( d ) 5 K H z

1 7. B a n d l i m i t e d s i gn a l i s ( a) B a n d p a s s s i g n al w i th i n fi n i t e B W ( b ) B a n d p a s s s i g n al w i th U p p e r f re qu e n c y l i m i t e q u a l t o z e r o ( c ) B a n d p a s s s i g n al b ot h w i th u p p e r a n d l owe r f r e q u e n c y l i m i t s ( d ) B a n d p a s s s i g n al w i th l owe r f r e q u e n c y l i m i t e q u a l t o z e r o

1 8. A ty p i c a l s q u e l ch c i rc u i t ( a) c u t s off t h e a u d i o am p l i fi e r w h e n t h e c ar r i e r i s b l o ck ( b ) e l i m i n a t e s t h e RF i nt e r f e re n c e w h e n t h e s i gn a l i s we ak ( c ) c u t s off t h e I F am p l i fi e r w h e n t h e AG C i s m i n i mu m ( d ) c u t s off t h e I F am p l i fi e r w h e n t h e AG C i s m a xi mu m

1 9. T h r e e p o i nt t r a cki n g i s a ch i e ve d w i t h ( a) d o u b l e s p ot t i n g ( b ) Pa d d e r C a p ac i t o r ( c ) b l o ck i n g ( d ) d o u b l e c o nve r s i o n

2 0. Q u ant i s i n g n oi s e o c c u r s i n ( a) T i m e - d i vi s i on mu l t i p l e x i n g ( b ) Fr e q u e n c y- d i vi s i on mu l t i p l e x i n g ( c ) P u l s e p o s i t i on m o d u l a t i on ( d ) P u l s e - c o d e m o d u l a t i on

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