Angle Modulation – 1 – 3

11. In a FM signal, the power …… as the modulation index increases.

(a) Increases
(b) Decreases
(c) Remains constant
(d) None of these

ANSWER

EXPLANATION

12. If signal band limited to fm is sampled at a rate less than 2 fm., the reconstructed signal will :

(a) Be smaller in amplitude
(b) Have higher frequencies suppressed
(c) Be distorted
(d) All the above

ANSWER

EXPLANATION

13. De-emphasis circuit is used :

(a) Before detection
(b) After detection
(c) Before modulation
(d) After modulation

ANSWER

EXPLANATION

14. Pre-emphasis is used to amplify …………… frequencies.

(a) Low
(b) High
(c) Both a and b
(d) None of the above

ANSWER

EXPLANATION

15. Pre-emphasis circuit is used :

(a) Before detection
(b) After detection
(c) Before modulation
(d) After modulation

ANSWER

EXPLANATION

1 2 3

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