Discussion
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- Question
Which of the following oscillator is generally not used at VHF?
Options- A. Colpitts oscillator
- B. Clapp oscillator
- C. Armstrong oscillator
- D. Ultra Audio oscillator
- Correct Answer
- Armstrong oscillator
- 1. If the intermediate frequency of a superheterodyne receiver falls within the tuning range of the receiver
Options- A. Unsuitability will occur
- B. Heterodyne whistles will be heard
- C. Tuning to the frequency band immediately adjacent to the intermediate frequency will become impossible
- D. All of the above Discuss
- 2. In a broadcast superheterodyne receiver
Options- A. the local oscillator operates below the signal frequency
- B. local oscillator frequency is normally double the IF
- C. RF amplifier normally works at kHz above the carrier frequency
- D. mixer input must be tuned to the signal frequency Discuss
- 3. In a radio receiver, if the intermediate frequency is too low
Options- A. Image-frequency rejection will improve
- B. Selectivity will be too sharp
- C. The frequency selectivity of the local oscillator will have to be lowered
- D. All of the above Discuss
- 4. Which of the following is same in AM and FM receivers?
Options- A. Demodulator
- B. AGC
- C. IF amplifier
- D. All of the above Discuss
- 5. The function of an AM detector circuit is to
Options- A. rectify the input signal
- B. discard the carrier
- C. provide audio signal
- D. all of the above Discuss
- 6. 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 Discuss
- 7. 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 Discuss
- 8. The sensitivity curve of a standard receiver is represented by
Options- A. curve A
- B. curve B
- C. curve C
- D. curve D Discuss
- 9. In a superheterodyne receiver with an IF of 450 kHz is tuned to a signal at 1200 kHz. The image frequency is
Options- A. 750 kHz
- B. 990 kHz
- C. 1650 kHz
- D. 2100 kHz Discuss
- 10. 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 Discuss
Radio Receivers problems
Search Results
Correct Answer: All of the above
Correct Answer: mixer input must be tuned to the signal frequency
Correct Answer: Selectivity will be too sharp
Correct Answer: IF amplifier
Correct Answer: all of the above
Correct Answer: Selectivity will be poor
Correct Answer: connect a receiver and a transmitter to the same antenna
Correct Answer: curve C
Correct Answer: 2100 kHz
Correct Answer: 336 kW
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