RF amplifiers are used in radio receivers for improved image frequency rejection

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Question
RF amplifiers are used in radio receivers for
Options
A. improved image frequency rejection
B. improved rejection of adjacent unwanted signals
C. prevention of re-radiation of the local oscillator through the antenna of the receiver
D. all of the above

Correct Answer

all of the above

Radio Receivers problems

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1. 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 input resistance of the detector is
Options
A. 114 kW
B. 336 kW
C. 384 kW
D. 455 kW

4. A duplexer is a device used to
Options
A. feed more than one receiver from a single antenna
B. connect two transmitters to the same antenna
C. connect a receiver and a transmitter to the same antenna
D. none of these

5. In a radio receiver, if the intermediate frequency is too high
Options
A. Selectivity will be poor
B. Tracking difficulties will be least
C. Adjacent channel rejection will improve
D. All of the above will occur

6. Which of the following should be used in order to prevent overloading or the last IF amplifier in a receiver?
Options
A. Variable selectivity
B. Variable sensitivity
C. Double conversion
D. Squelch

9. Modulated carrier power in FM
Options
A. increases with modulating signal power
B. decreases with modulating signal power
C. is independent of the modulating signal power
D. none

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