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

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

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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

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

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

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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

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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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