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Communication System
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Communication System
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25 Questions

1. DVD uses
2. PAM stands for
3. Under ordinary circumstances, impulse noise can be reduced in
4. woofer should be fed from the input through a
5. The disadvantage of FM over AM is that
6. In a FM receiver, amplitude limiter
7. In TV systems, equalising pulses are sent during
8. Leak type bias is used in plate modulated class C amplifier to
9. For telegraphy the most commonly used modulation system is
10. VSB modulation is preferred in TV because
11. zero mean white Gaussian noise is passed through an ideal low pass filter of bandwidth 10 kHz. The output of the samples so obtained would be
12. The frequency range of 300 kHz to 3000 kHz is known as
13. three stage telephone switching structure is to have 128 input and 128 output terminals. There are 16 first stage and 16 third stage matrices. To avoid blocking the number of intermediate paths required is
14. Which of the following statements is correct?
15. An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are
16. If output power of a radio receiver is doubled, its volume is increased by __________ dB.
17. Which of the following is used to generate PDM?
18. Which one of the following is analog?
19. In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then
20. What is the purpose of peak clipper circuits in radio transmitters?
21. Full duplex operation-permits transmission in both directions at the same time.
22. As per Shannon-Hartley theorem, a noise less Gaussian channel has
23. In practical commercial FM system, channel bandwidth is
24. The characteristic impedance of a twin wire feeder used for TV signals is about
25. A telephone channel requires a bandwidth of about

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