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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