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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 10
11.
Consider the following statements as regards DPSK and DEPSK
  1. DPSK demodulator requires a device which operates at carrier frequency and provides a delay of bit time Tb
  2. In DPSK, synchronous demodulation recovers the signal b(t) and the decoding of b(t) to generate d(t) is done at base band
  3. In both DPSK and DEPSK errors always occur in pairs
Which of the above statements are correct?
1 and 3
1 and 2
2 and 3
1, 2 and 3
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
An audio frequency of 5 kHz is translated to a radio frequency carrier of frequency 1 MHz and transmitted it to space through an antenna. The required height of antenna is
150 m
300 m
75 m
600 m
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
Pre-emphasis circuit is used
after modulation
before modulation
before detection
after detection
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
In which frequency range is the noise figure in a transistor minimum
intermediate frequencies
low frequencies
high frequencies
very high frequencies
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
In commercial FM Broadcasting, A radio station transmitting the signal at 98.3 MHz, it is
carrier frequency
modulation frequency
message frequency
channel frequency
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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