electronics-and-communication-engineering-radio-receivers Related Question Answers

1. In a broadcast superheterodyne receiver





2. A duplexer is a device used to





3. A heterodyne frequency changer is called a





4. RF amplifiers are used in radio receivers for





5. The sensitivity curve of a standard receiver is represented by





6. Which are the popular IF frequencies for microwave and radar receivers operating on frequencies in the range 1 to 10 GHz





7. In a ratio detector





8. Neutralization is used in RF amplifiers to





9. When fs is the signal frequency and fi is the intermediate frequency, then image frequency fsi is given by



10. It is known that noise phase modulates the FM wave. As the noise side band frequency approaches the carrier frequency, the noise amplitude





11. In a receiver, which of the following device has IF input but RF output?





12. Transistor are free from which type of noise?





13. Standard AM radio broadcasts are confined to





14. A transmitter serial current contains





15. 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





16. The noise produced by a resistor is proportional to



17. In a radio receiver, if the intermediate frequency is too high





18. In a superheterodyne receiver, the IF is 455 kHz. If it is tuned to 1200 kHz, the image frequency will be





19. The selectivity of most receivers is determined largely by





20. In a superheterodyne receiver with an IF of 450 kHz is tuned to a signal at 1200 kHz. The image frequency is





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 rejection ratio at 25 MHz will be





22. As compared to tuned radio frequency receivers which of the following is the advantage of using superheterodyne receivers?





23. In a radio receiver, if the intermediate frequency is too low





24. FM amplifier in a superheterodyne receiver





25. Padders are used in a receiver to





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