Exercise: Communication Systems

Questions for: Communication Systems

Consider the following statements as regards pulse repetition frequency
  1. Pulse interval should be as large as possible so that a pulse returns before next pulse is transmitted
  2. Greater the number of pulses reflected from a target, greater is the probability of distinguishing it from the noise
Which of the above are correct?
A:
1 only
B:
2 only
C:
both 1 and 2
D:
neither 1 nor 2
Answer: C
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Identical telephone numbers in different parts of a country are distinguished by their
A:
area codes
B:
office codes
C:
access digits
D:
language codes
Answer: A
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A sinusoidal carrier voltage, having frequency 1000 Hz is amplitude modulated by a sinusoidal voltage of frequency 15 kHz. The frequency of upper and lower sidebands will be
A:
1015 kHz and 985 kHz
B:
1030 kHz and 970 kHz
C:
13 kHz and 17 kHz
D:
14 kHz and 16 kHz
Answer: D
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In MTI radar, clutter means
A:
echos from moving targets
B:
echos from stationary targets
C:
atmospheric noise
D:
thermal noise
Answer: B
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A pulse width signal can be governed by
A:
free running multi-vibrator
B:
monostable multi-vibrator
C:
Schmitt trigger
D:
JK flip-flop
Answer: B
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