A Best Way To Crack Gorenment Job Exams

ECE Objective Questions { BJT Amplifiers and Transistor }



50. The term Av of an amplifier is called
A. feedback factor
B. gain with feedback
C. gain without feedback
D. loop gain

51. A two-transistor class-B amplifier is usually called?amplifier.
A. symmetrical
B. inverting
C. push-pull
D. dual

52. The noise factor of an ideal amplifier is dB.
A.0
B.0.5
C.5
D.10

53. Which frequency produces the highest noise factor in a transistor?
A. 50 Hz
B. 5 kHz
C. 10 kHz
D. dc

54. In an ideal Op Amp, the input impedance is
A. zero
B. 50 SI
C. infinite
D. 1 f2

55. In order to avoid a high noise figure in an amplifier, the volume control should
A. have a value less than 5 kfl
B. have a value greater than 5 K2
C. not have large dc current flowing through it
D. be much less than base resistance

56. For sustaining oscillations, power gain of an amplifier
A. may be between 0.25 and 0.75
B. may be any value from 0.5 upwards
C. must be greater than 1.0
D. may/be equal to or greater than 1.0

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