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ECE Objective Questions { Operational Amplifier and Its Applications }



36.  The op-amp of Fig. 6.7 has a non-invering gain of 101. If R2 = 1 M, value of R1 should be ......... ka.
A.10.1
B.100
C.10
D.101

37. An op-amp when used as a notch filter has a notch frequency = 2 kHz, low-frequency point (3 dB), = 1.8 kHz and high-frequency point = 2.2 kHz. The Q of the notch is
A.0.5
B.5
C.0.2
D.2

38. A class A power amplifier uses
A. two transistors
B. three transistors
C. one transistor
D. none of the above

39. The maximum efficiency of resistance loaded class A power amplifier is
A.78.50%
B.50%
C.30%
D.25%

40. The maximum efficiency of transformer coupled class A power amplifier is
A.30%
B.50%
C.80%
D.45%

41.  Class ............ power amplifier has the highest collector efficiency.
A. C
B. A
C.B
D. AB

42.  Power amplifier handle ............ signals compared to voltage amplifiers.
A. small
B. very small
C. large
D. none of the above

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