17. An SSB music transmission consists of a 1.5 kHz sine wave as well as its thi

Question

17.   An SSB music transmission consists of a 1.5 kHz sine wave as well as its third and fifth harmonics, 4.5 kHz and 7.5 kHz. If the receiver's demodulator drifts by 500 Hz, which of the following output frequencies A. 1.5 kHz B. 7 kHz C. 5 kHz D. 2 kHz 18.   A slowly varying dc level can be obtained by _______ the RC time constant.      A. decreasing B. increasing C. distorting D. deleting 19.   An essential function within any receiver is some form of      A. AM broadcast. B. IF stage. C. RC filter. D. AGC
20.   A receiver's demodulator oscillator drifts by 250 Hz. As a result of this drift, an SSB music transmission at 5 kHz is heard at the speaker output at 5.25 kHz instead. At what frequency would the second harmonic be heard if the same drift of the demodulator oscillator was still present?      A. 10.25 kHz B. 4.75 kHz C. 9.75 kHz D. 15.25 kHz 21. What's the purpose of a detector?      A. Introducing harmonic frequencies B. Recovering the low-frequency intelligence or baseband signal from the much higher intermediate- or radio-frequency carrier C. Showing results in a frequency domain D. Detecting intelligence 22.Which of these is a unique part of a superheterodyne receiver block diagram?      A. IF amplifier B. Tuned circuit C. Mixer output components D. Trimmers 17.   An SSB music transmission consists of a 1.5 kHz sine wave as well as its third and fifth harmonics, 4.5 kHz and 7.5 kHz. If the receiver's demodulator drifts by 500 Hz, which of the following output frequencies A. 1.5 kHz B. 7 kHz C. 5 kHz D. 2 kHz 18.   A slowly varying dc level can be obtained by _______ the RC time constant.      A. decreasing B. increasing C. distorting D. deleting 19.   An essential function within any receiver is some form of      A. AM broadcast. B. IF stage. C. RC filter. D. AGC
20.   A receiver's demodulator oscillator drifts by 250 Hz. As a result of this drift, an SSB music transmission at 5 kHz is heard at the speaker output at 5.25 kHz instead. At what frequency would the second harmonic be heard if the same drift of the demodulator oscillator was still present?      A. 10.25 kHz B. 4.75 kHz C. 9.75 kHz D. 15.25 kHz 21. What's the purpose of a detector?      A. Introducing harmonic frequencies B. Recovering the low-frequency intelligence or baseband signal from the much higher intermediate- or radio-frequency carrier C. Showing results in a frequency domain D. Detecting intelligence 22.Which of these is a unique part of a superheterodyne receiver block diagram?      A. IF amplifier B. Tuned circuit C. Mixer output components D. Trimmers

Explanation / Answer

17) the demodulator frequency drifts by 0.5 kHz, then the output frequency is 1.5 + 0.5 kHz = 2 KHz and 5 KHz

Thus answer is c and d

18) A slowly varying DC level is obtained from decreasing rc time constant. Thus answer is A

19) IF stage

20) 10.25 KHz

21) recover the baseband signal from high carrier frequency signals. Thus answer is B

22) tuned circuit

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