Exercise: Communication Systems

Questions for: Communication Systems

Transit time is considered as significant at
A:
HF
B:
MF
C:
LF
D:
all of the above
Answer: D
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Which of the following pulse-time modulation is least used?
A:
PDM
B:
PPM
C:
PWM
D:
PAM
Answer: D
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A radio frequency signal contains the following three frequencies :
850 kHz; 865 kHz and 875 kHz
In order to amplify this signal, which of the following amplifier should be selected?
A:
Push pull amplifier
B:
Wideband amplifier
C:
Audio frequency amplifier
D:
Tuned voltage amplifier
Answer: D
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A shadow zone does not receive any space wave
A:
True
B:
False
C:
D:
Answer: A
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In a radio receiver the input from local oscillator is fed to
A:
RF amplifier
B:
mixer
C:
IF amplifier
D:
detector
Answer: B
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