Electrical Engineering MCQs

Page No. 151

An amplifier using an opamp with slew rate SR=1v/sec has a gain of 40db.If this amplifier has to faithfully amplify sinusoidal signals from dc to 20KHz without introducing any slew-rate induced distortion, then the input signal level exceed_____________?


a795mV


b395mV


c795mV


d39.5mV


View Answer 795mV

An ideal OP-AMP is an ideal__________?


aCurrent controlled Current source


bCurrent controlled Voltage source


cVoltage controlled Voltage source


dVoltage controlled Current source



How many op-amps are required to implement this equation Vo = V1?


a4


b3


c2


d1


View Answer 1

How many op-amps are required to implement this equationop-amps?


a2


b3


c4


d1


View Answer 1

The ideal OP-AMP has the following characteristics


aRi=∞ ,A=∞ ,R0=0


bRi=0 ,A=∞ ,R0=0


cRi=∞ ,A=∞ ,R0=∞


dRi=0 ,A=∞ ,R0=∞


View Answer Ri=∞ ,A=∞ ,R0=0

If ground is applied to the (+) terminal of an inverting op-amp, the (–) terminal will_____________?


aNot need an input resistor


bBe virtual ground


cHave high reverse current


dNot invert the signal


View Answer Be virtual ground

An ideal OP-AMP is an ideal______________?


aCurrent controlled Current source


b Current controlled voltage source


c Voltage controlled voltage source


dvoltage controlled current source



A non inverting closed loop op amp circuit generally has a gain factor______________?


aLess than one


bGreater than one


cOf zero


dEqual to one


View Answer Greater than one

The closed-loop voltage gain of an inverting amplifier equal to______________?


aThe ratio of the input resistance to feedback resistance


bThe open-loop voltage gain


cThe feedback resistance divided by the input resistance


dThe input resistance



Calculate the cutoff frequency of a first-order low-pass filter for R1 = 2.5kΩ and C1 = 0.05μF___________?


a1.273kHz


b12.73kHz


c127.3 kHz


d127.3 Hz


View Answer 1.273kHz

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