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ECE Objective Questions { Operational Amplifier and Its Applications }



8.  In an inverting amplifier, the two input terminals of an ideal OP-AMP are at the same potential because.
A. the two input terminals are directly shorted internally
B. the input impedance of the OP-AMP is infinity
C. common-mode rejection ratio is infinity
D. the open-loop gain of the OP-AMP is infinity

9. The open-loop gain of the operational amplifier is 105. An input signal of 1 mV is applied to the inverting input with the non-inverting input connected to the ground. The supply voltages are ?10V. The output of the amplifier will be
A. +100V
B.? 100 V
C. + 10 V (approximately)
D. ? 10 V (approximately)

10. When in a negative scaler, both RI and Rf are reduced to zero, the circuit functions as
A. integrator
B.diffrentiator
C.comparator
D. transistor parameters determine oscillation frequency.

11. The two input terminals of an OP-AMP are known as
A. positive and negative
B. differential and non-differential
C. inverting and non-inverting
D. high and low

12.  The purpose of comparator is to
A. amplify an input voltage
B. detect the occurrence of a changing input voltage
C. maintain a constant output when the dc input voltage changes.
D. produce a change in input voltage when an input voltage equals the reference voltage. ?

13.  The OP-AMP comparator circuit uses
A. positive feedback
B. negative feedback
C. regeneratiye feedback
D. no feedback

14.  The feedback path in an OP-AMP integrator constant of
A. a resistor
B. a capacitor
C. a resistor and a capacitor in series
D. a resistor and a capacitor in parallel.

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