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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