Exercise: Radio Receivers

Questions for: Radio Receivers

The problem associated with tuned-radio frequency receiver is
A:
instability
B:
insufficient adjacent frequency rejection
C:
bandwidth variation
D:
all of the above
Answer: D
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Most of the amplification of the received signal is obtained in a superheterodyne receiver from the
A:
IF stage
B:
RF stage
C:
power amplification stage
D:
none of the above
Answer: A
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FM receivers using the standard 88 to 108 MHz band use IF of
A:
8 MHz
B:
9.9 MHz
C:
10.7 MHz
D:
12.2 MHz
Answer: C
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Selectivity varies with receiving frequency, frequency is raised.
A:
Somewhat better when the receiving frequency is raised
B:
Somewhat better at intermediate frequency
C:
Somewhat worse when the receiving frequency is lowered
D:
Somewhat worse when the receiving frequency is raised
Answer: D
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An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. A micrometer shows that the rectified DC current in this resistance is 30 A. The efficiency of detection is
A:
34%
B:
55.5%
C:
68.8%
D:
84.7%
Answer: D
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