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ECE Objective Questions { Digital Communication System }

22. Frequency frogging is used in carrier system to
A. conserve frequencies
B. reduce distortion
C. reduce crosstalk
D. None of the above

23. A matching stub should be
A. nearest to load
B. nearest to transmitter
C. midway between load and transmitter
D. On the load

24. Stub-matching eliminates standing waves on
A. load side of stub
B. transmitter side of stub
C. both sides of stub
D. None of the above

25. A transistor is basically an amplifying device for
A. current
B. voltage
C. power
D. signal

26. PCM transmission requires?bandwidth than amplitude modulated transmission.
A. more
B. less
C. same
D. None of the above

27. The signal-to-quantisation noise ratio in a PCM system depends upon
A. sampling rate
B. No. of quantisation levels
C. message signal bandwidth
D. None of the above

28. The noise generated by a resistor depends upon
A. its resistance value
B. its operating temperature
C. both (a) and (b)
D. Material type

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