Exercise: Radio Receivers

Questions for: Radio Receivers

In a receiver, which of the following device has IF input but RF output?
A:
Demodulator
B:
Loudspeaker
C:
Audio amplifier
D:
Frequency changer
Answer: A
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It is known that noise phase modulates the FM wave. As the noise side band frequency approaches the carrier frequency, the noise amplitude
A:
will increase
B:
will decrease
C:
will remain constant
D:
will reduce to negligible value
Answer: B
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When fs is the signal frequency and fi is the intermediate frequency, then image frequency fsi is given by
A:
fsi = fs - 2fi
B:
fsi = fs + 2fi
C:
D:
Answer: B
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Neutralization is used in RF amplifiers to
A:
stop oscillation
B:
increase bandwidth
C:
improve selectivity
D:
all of the above
Answer: A
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In a ratio detector
A:
the linearity is worse than in a phase discriminator
B:
the output is twice that obtainable from a similar phase discriminator
C:
stabilization against signal strength variations is provided
D:
the circuit is the same as in a discriminator, except that the diodes are reversed
Answer: A
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