Exercise: Communication Systems

Questions for: Communication Systems

During amplitude modulation, the phase angle of the modulating voltage changes by
A:
0°
B:
45°
C:
90°
D:
180°
Answer: A
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Some features of RF stage in good radio receivers is
  1. It increases sensitivity by providing amplification to RF signal
  2. It eliminates image frequency interference
  3. It increases selectivity
  4. It reduces noise level
Which of the above are true?
A:
1, 2 and 3 only
B:
1, 2 and 4 only
C:
2, 3, 4 only
D:
1, 2, 3, 4
Answer: D
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In communication receivers the fidelity is provided by
A:
audio stage
B:
detector range
C:
mixer stage
D:
all of the above
Answer: A
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In a television camera tube, scanning of a picture is done
A:
line by line from left to right
B:
line by line from right to left
C:
line by line from top to bottom
D:
line by line from bottom to top
Answer: A
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A balanced modulator circuit uses
A:
two identical diodes with same V-I characteristics
B:
two triodes with different V-I characteristics
C:
two diodes with different V-I characteristics
D:
a diode and a triode
Answer: A
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