Amplifiers Objectives Part 03
41 . Class B amplifier has less efficiency as compared to Class C.
42 . Push pull amplifiers not necessarily removes odd and even harmonics.
43 . Decibel is defined in Power ratio.
44 . An amplifier’s changes from 10 watts to 20 watts. The equivalent dB gain will be 3 dB
45 . Which of following is false statement?
Class AB operation cannot be used for a push pull audio power output phase.
46 . A push pull amplifier balance out odd harmonics.
47 . In voltage amplifiers, the load resistance should be as large as possible.
48 . Phase distortion is least objectionable in case of audio amplifiers.
49 . Wave traps in each stage method cannot be used to increase the bandwidth for cascaded RF amplifier stages.
50 . If fr = 455 kHz ; Q = 100 circuit has the greatest bandwidth.
51 . In an amplifier if conductor during the cycle is from 0 to 90 and again from 180 to 270, the amplifier will be termed as Class B.
52 . The voltage gain of an amplifier is 100. On applying a negative feedback with B = 0.05 its gain will reduce to 25.
53 . Negative feedback is used in audio amplifier to reduce distortion.
54 . capacitive reactance in shunt with an audio amplifier has the effect of treble boost.
55 . High cut-off frequency can be expected in case of Common Base
56 . For high frequency response of transistor amplifier, suitable model to use is Hybrid.
57 . Transformer coupling in transistor amplifier, circuit provides high efficiency, because DC resistance is low.
58 . A complementary symmetry amplifier ha 1 PNP and 1 NPN transistor.
59 . Introduction of feedback in an amplifier increase the input impedance from 1 k ohm to 40 k ohm.it is due to series-current negative feedback.
60 . A pulse transformer uses ferrite core.