113. When the modulation index of an amplitude modulated wave is changed from 0 to 1, the transmitted power will
A. remain unchanged
B. decrease by 50%
C. increase by 50%
D. increase by 100%

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114. Which one of the following cannot be used to remove the unwanted side band in SSB?
A. Phase shift devices
B. Balanced modulator
C. Filters
D. All of the above

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115. If Em be the peak value of the modulating voltage and Er be the peak value of carrier voltage, then modulation index, is given by
A. M = K EmEr
B. M = K Em
C. M K ?Er
D. M = K E

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116. A balanced modulator circuit uses
A. two identical diodes
B. two identical triodes
C. two diodes with different V-1 characteristics
D. two triodes with different V-I characteristics

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117. A CW transmitter radiates
A. modulated RF carrier
B. unmodulated RF carrier
C. both (a) and (b) above
D. none of the above

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118. A buffer amplifier is
A. a double-tuned amplifier
B. a high gain dc amplifier
C. a cathode follower stage
D. none of the above

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119. A 3A modulation is sometimes used to
A. allow thereceiver to have a frequency synthesizer
B. reduce the bandwidth required for transmission
C. reduce the power that must be transmitted
D. simplify the frequency stability problem in reception

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