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ECE Objective Questions { Operational Amplifier and Its Applications }

15. The feedback path in an OP-AMP differentiator consists of
A. a resistor
B. a capacitor
C. a resistor and a capacitor in series
D. a resistor and a capacitor in parallel.

16. An electronic oscillator is
A. just like an alternator
B. nothing but an amplifier
C. an amplifier with feedback
D. a converter of ac to dc energy

17. The frequency of oscillation of an elementary LC oscillatory circuit depends on
A. coil resistance
B. coil inductance
C. capacitance
D. both (b) and (c)

18. For sustaining oscillations in an oscillator
A. feedback factor should be unity
B. phase shift should be 0?
C. feedback should benegative
D. both (a) and (b)

19. If Barkhausen criterion is not fulfilled by an oscillator circuit, it will
A. stop oscillating
B. produce damped waves continuously
C. become an amplifier
D. produce high-frequency whistles

20.  In a transistor Hartley oscillator
A. inductive feedback is used
B. untapped coil is used
C. entire coil is in the output circuit
D. no capacitor is used

21. A Hartley oscillator is used for generating
A. very low frequency oscillation
B. radio-frequency oscillation
C. microwave oscillation
D. audio-frequency oscillation

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