Code: A - 15
Subject: COMMUNICATION ENGINEERING
Time: 3 Hours
Max. Marks: 100
NOTE: There are 11 Questions in all.  
  • Question 1 is compulsory and carries 16 marks. Answer to Q. 1. must be written in the space provided for it in the answer book supplied and nowhere else.
  • Answer any THREE Questions each from Part I and Part II. Each of these questions carries 14 marks.
  • Any required data not explicitly given, may be suitably assumed and stated
Q.1
 Choose the correct or best alternative in the following: (2x8)
 
a.
FM discriminator changes FM signal into
(A) AM signal.        (B) FM signal of higher intensity.
(C) PM signal.         (D) Single side band AM signal.
 
b.
 The pre-emphasis circuit in Frequency Modulation system is used
(A) to increase the amplitude of low frequency component of the signal.
(B) to increase the amplitude of high frequency component of the signal.
(C) after the modulation.
(D) prior to modulation.
 
c.
Increasing the peak power by 12 dB in a radar system will increase its range by a factor of about
(A) 2.                     (B) 4.
(C) 12.                   (D) 16.
 
d.
Demodulation of SSB-SC requires
(A) an envelop detector.       (B) a synchronous detector.
(C) a discriminator.               (D) an integrator.
 
e.
The effect of noise in a communication system is most adverse with reference to
(A) channel.                           (B) encoder.
(C) source / transmitter.          (D) receiver.

 
f.
 Occurrence of turning up of tail when a coin is tossed has the information equal to
(A) 0 bit.                (B) 4 bit.
(C) 8 bit.                (D) 1 bit.
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