Q.18. EM 84 tube is used in radio receivers as Q.17. If the intermediate frequency of a superheterodyne receiver falls within the tuning range of the receiverĬ. Tuning to the frequency band immediately adjacent to the intermediate frequency will become impossible Q.16. The selectivity of a radio receiver is ……….Ī. its ability to reject adjacent unwanted signalsĬ. the frequency at which it gives maximum amplification to signal. Q.15. Which of the following is used to provide tracking between RF amplifier and local oscillator stages of receiver? Q.14. Noise generated in a resistor is also known as Q.13. Which of the following noise does not occur in transistors? Q.12. The output of a diode detector contains The input resistance of the detector is ……. A micrometer shows that the rectified DC current in this resistance is 30 A. Q.11. An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10 -5 ohms. Q.10. Which of the following oscillator is generally not used at VHF? Q.9. In a radio receiver, the local oscillator is tuned to a frequency Q.7. FM amplifier in a superheterodyne receiverĭ. improves the rejection of the image frequency Q.6. In a radio receiver, if the intermediate frequency is too lowĪ. Image-frequency rejection will improveĬ. The frequency selectivity of the local oscillator will have to be lowered ![]() ![]() Q.5. As compared to tuned radio frequency receivers which of the following is the advantage of using superheterodyne receivers?ī. Better selectivity at high frequencies The rejection ratio at 25 MHz will be ……… If the intermediate frequency is 455 kHz. Q.4. In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100.
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