50.

51.

52.

53.

54.

55,

56,

57.

58,

can be used for the demodulation of PM.
(ക) FM demodulator followed by an integrator
(8) AM demodulator followed by a filter
(ப) Envelope detector with a low pass filter
(0) Frequency converter

The error due to insufficient sampling rate is called :
(ಗಿ) aliasing (8) quantisation error
(0) slope overload (D) grannular error

1
A signal m(f) band limited to 3 kHz is sampled at a rate 33 3 % higher than Nyquist rate.

What is the actual sampling rate ?
(A) 6000 Hz (B) 8000 Hz (C) 6600 Hz (D) 3300 Hz

‘The number of message points in the signal space diagram of BFSK is :
(ಹ) 8 B 6 (© 4 फ) 2

The primary objective of spectrally efficient modulation is to :
(A) maximize power efficiency

(B) reduce bit error rate

(C) maximize the bandwidth efficiency

(D) improve SNR

Average informalion content per source symbol of a discrete memoryless source is termed
85:

(A} information rate (B) entropy
(0) information capacity (D) data compaction

The power spectral density of a stationary process is always :
(ಯ) zero (B) positive (0) negative (D) non negative

For the same bit energy to noise density ratio the bit error rate of :
(A) Coherent BFSK is less (ए) Coherent BPSK is less
(ಲ) BPSK and BFSK are same (D) BPSK and BFSK cannot be compared

A continuous time signal can be converted to discrete time signal by :
(A) sampling and quantising (8) quantising and sampling
(ര convoluting with train of pulses (D) 10% pass filtering and differentiation
9 155/2014
[P.T.O.}