162.  The selectivity factor is
A. 1.27 : 1
B.2.31 : 1
C. 2.99 : 1
D. 3.67 : 1

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163. The 45?? 45? system refers to stereo for
A. magnetic tape recorders
B. phonograph records
C. crystal microphones
D. loudspeakers

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164. Which of the following would apply to the audio power output stage?
A. Negligible distortion_
B. Low level signal
C. Complimentary symmetry
D. Class-Coperation

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165. The gains of the three stages of a multistage amplifiers are 40, 50 and 80. The overall voltage gain in dl will be
A. 120,000 dB
B. 1200 dB
C. 101.58 dB
D. 16 dB

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166. Two radio frequency amplifier are in cascade, one has a gain of 20 dB and and other 40 dB. The overall gain in dB is
A.40
B.60
C.80
D.800

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167. Two radio frequency amplifier are in cascade, one has a gain of 20 dB and and other 40 dB.The overall gain in voltage is
A.50
B.60
C.100
D.800

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168. The gain of an RF amplifier with a tuned LC circuit for the collector is maximum at the resonant frequency because of
A. low Q
B. high emitter resistance
C. parallel resistance
D. series resonance

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