Noise in Communication Systems – 1 – 2

6. ……. Is the unit of loudness.

(a) Decibel
(b) Mel
(c) Phon
(d) 
Sone

ANSWER

EXPLANATION

7. ….. is the power ratio of one decibel.

(a) 1.26 : 1
(b) 2 : 1
(c) 5 : 1
(d) 
10 : 1

ANSWER

EXPLANATION

8. The ionosphere consists of ……. Layer.

(a) Positive charge
(b) Negative charge
(c) Neutral
(d) 
Any of the other

ANSWER

EXPLANATION

9. The channel capacity is exactly equal to which of the following ?

(a) Noise rate in the channel
(b) Bandwidth of demand
(c) Amount of information per second
(d) 
None

ANSWER

EXPLANATION

10. Sampling theorem finds application in :

(a) Frequency modulation
(b) Amplitude modulation
(c) PCM
(d) None of the above

ANSWER

EXPLANATION

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