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Principle of Communication Engineering: Radio Receivers
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Principle of Communication Engineering: Radio Receivers
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25 Questions

1. What does a transmitter serial current contain?
2. For which purpose, the neutralization is used in RF amplifiers?
3. The selectivity of most receivers is determined largely by …….
4. For which purpose EM 84 tube is used in radio receivers?
5. In a radio receiver, if the intermediate frequency is too low
6. FM amplifier in a superheterodyne receiver
7. Which of the following device has IF input but RF output in a receiver?
8. The frequency generated by each decade in a direct frequency synthesizer is much higher than the frequency shown; this is done to
9. If a FET is used as the first AF amplifier in a transistor receiver, this will have the effect of
10. In a ratio detector
11. Which of the following produces upper and lower side frequencies?
12. What happens, if the intermediate frequency is too high in a radio receiver?
13. What is the selectivity of a radio receiver?
14. The controlled oscillator synthesizer is sometimes preferred over the direct one because
15. In a superheterodyne receiver, the IF is 455 kHz. If it is tuned to 1200 kHz, the image frequency will be
16. The local oscillator is tuned to a frequency …………… In a radio receiver.
17. In a broadcast superheterodyne receiver, the
18. Padders are used in a receiver to
19. Indicate the false statement in connection with communications receivers.
20. Three-point tracking is achieved with
21. In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. The image frequency at 25 MHz will be
22. Transistor are free from which type of noise?
23. One of the main functions of the RF amplifier in a superheterodyne receiver is to
24. ………….. should be used in order to prevent overloading or the last IF amplifier in a receiver.
25. A transmitter serial current contains

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