Electronics and Communication Engineering - Communication Systems

41.
In MTI radar, clutter means
echos from moving targets
echos from stationary targets
atmospheric noise
thermal noise
Answer: Option
Explanation:
No answer description is available. Let's discuss.

42.
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
1015 kHz and 985 kHz
1030 kHz and 970 kHz
13 kHz and 17 kHz
14 kHz and 16 kHz
Answer: Option
Explanation:
No answer description is available. Let's discuss.

43.
Identical telephone numbers in different parts of a country are distinguished by their
area codes
office codes
access digits
language codes
Answer: Option
Explanation:
No answer description is available. Let's discuss.

44.
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?
1 only
2 only
both 1 and 2
neither 1 nor 2
Answer: Option
Explanation:
No answer description is available. Let's discuss.

45.
Which gives minimum probability of error?
ASK
FSK
PSK
DPSK
Answer: Option
Explanation:
No answer description is available. Let's discuss.