Radio Receivers - Section 1 (4)
Radio Receivers - Section 1
| 25. | In a superheterodyne receiver, the IF is 455 kHz. If it is tuned to 1200 kHz, the image frequency will be |
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Answer: Option B Explanation: A signal (image) can interfere with a superheterodyne receiver if fits the following equation. Image = Signal +/- 2 x I.F. Which says that a signal has the capacity to interfere with a superhet receiver if its frequency is equal to the signal frequency (1200 kHz in our question) plus or minus twice the IF (455 kHz in our question). So one possible image is: 1200 + ( 2 x 455 ) = 2110 kHz (possible). And the other: 1200 - ( 2 x 455 ) = 290 kHz (not likely). |
| 26. | In a radio receiver, if the intermediate frequency is too high |
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Answer: Option A Explanation: No answer description available for this question. Let us discuss. |
| 27. | The noise produced by a resistor is proportional to |
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Answer: Option A Explanation: No answer description available for this question. Let us discuss. |
| 28. | In a communication system, noise is most likely to affect the signal |
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Answer: Option B Explanation: No answer description available for this question. Let us discuss. |
| 29. | 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 |
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Answer: Option D Explanation: No answer description available for this question. Let us discuss. |
| 30. | A transmitter serial current contains |
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Answer: Option C Explanation: No answer description available for this question. Let us discuss. |
| 31. | Which of the following cannot be used to demodulate SSB? |
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Answer: Option D Explanation: No answer description available for this question. Let us discuss. |
| 32. | In a radio receiver with simple AGC |
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Answer: Option C Explanation: No answer description available for this question. Let us discuss. |