Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 26 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

1.

The closed-loop voltage gain of an inverting amplifier equal to______________?
A. The ratio of the input resistance to feedback resistance
B. The open-loop voltage gain
C. The feedback resistance divided by the input resistance
D. The input resistance
Answer» D. The input resistance
Discussion
2.

How many op-amps are required to implement this equation Vo = V1?
A. 4
B. 3
C. 2
D. 1
Answer» E.
Discussion
3.

An ideal OP-AMP is an ideal__________?
A. Current controlled Current source
B. Current controlled Voltage source
C. Voltage controlled Voltage source
D. Voltage controlled Current source
Answer» D. Voltage controlled Current source
Discussion
4.

In the above circuit the current ix is___________?
A. 0.6A
B. 0.5A
C. 0.2A
D. 1/12A
Answer» C. 0.2A
Discussion
5.

An ideal OP-AMP is an ideal______________?
A. Current controlled Current source
B. Current controlled voltage source
C. Voltage controlled voltage source
D. voltage controlled current source
Answer» D. voltage controlled current source
Discussion
6.

The two input terminals of an opamp are labeled as______________?
A. High and low
B. Positive and negative
C. Inverting and non inverting
D. Differential ans non differential
Answer» D. Differential ans non differential
Discussion
7.

How many op-amps are required to implement this equationop-amps?
A. 2
B. 3
C. 4
D. 1
Answer» E.
Discussion
8.

An OPAMP has a slew rate of 5 V/μ S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is_______________?
A. 10 volts
B. 5 volts
C. 5/ volts
D. 5/2 volts
Answer» E.
Discussion
9.

An opamp has a slew rate of 5V/ S. the largest sine wave o/p voltage possible at a frequency of 1MHz is____________?
A. 10 V
B. 5 V
C. 5V
D. 5/2 V
Answer» B. 5 V
Discussion
10.

Hysteresis is desirable in Schmitt-trigger, because______________?
A. Energy is to be stored/discharged in parasitic capacitances
B. Effects of temperature would be compensated
C. Devices in the circuit should be allowed time for saturation and desaturation
D. It would prevent noise from causing false triggering
Answer» D. It would prevent noise from causing false triggering
Discussion
11.

The approximate input impedance of the opamp circuit which has Ri=10k, Rf=100k, RL=10k?
A. ∞
B. 120k
C. 110k
D. 10k
Answer» D. 10k
Discussion
12.

The output voltage Vo of the above circuit is____________?
A. -6V
B. -5V
C. -1.2V
D. -0.2V
Answer» C. -1.2V
Discussion
13.

The ideal OP-AMP has the following characteristics
A. Ri=∞ ,A=∞ ,R0=0
B. Ri=0 ,A=∞ ,R0=0
C. Ri=∞ ,A=∞ ,R0=∞
D. Ri=0 ,A=∞ ,R0=∞
Answer» B. Ri=0 ,A=∞ ,R0=0
Discussion
14.

A 741-Type OP-AMP has a gain-bandwith product of 1MHz. A non-inverting amplifier using this opamp & having a voltage gain of 20db will exhibit -3db bandwidth of______________?
A. 50KHz
B. 100KHz
C. 1000/17KHz
D. 1000/7.07KHz
Answer» B. 100KHz
Discussion
15.

For an ideal op-amp, which of the following is true?
A. The differential voltage across the input terminals is zero
B. The current into the input terminals is zero
C. The current from output terminal is zero
D. The output resistance is zero
Answer» D. The output resistance is zero
Discussion
16.

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_____________?
A. 795mV
B. 395mV
C. 795mV
D. 39.5mV
Answer» D. 39.5mV
Discussion
17.

Calculate the cutoff frequency of a first-order low-pass filter for R1 = 2.5kΩ and C1 = 0.05μF___________?
A. 1.273kHz
B. 12.73kHz
C. 127.3 kHz
D. 127.3 Hz
Answer» B. 12.73kHz
Discussion
18.

A non inverting closed loop op amp circuit generally has a gain factor______________?
A. Less than one
B. Greater than one
C. Of zero
D. Equal to one
Answer» C. Of zero
Discussion
19.

If ground is applied to the (+) terminal of an inverting op-amp, the (–) terminal will_____________?
A. Not need an input resistor
B. Be virtual ground
C. Have high reverse current
D. Not invert the signal
Answer» C. Have high reverse current
Discussion
20.

A differential amplifier is invariably used in the i/p stage of all op-amps. This is done basically to provide the op-amps with a very high______________?
A. CMMR
B. Bandwidth
C. Slew rate
D. Open-loop gain
Answer» D. Open-loop gain
Discussion
21.

Assume that the op-amp of the fig. is ideal. If Vi is a triangular wave, then V0 will be______________?
A. Square wave
B. Triangular wave
C. Parabolic wave
D. Sine wave
Answer» E.
Discussion
22.

A differential amplifier has a differential gain of 20,000. CMMR=80dB. The common mode gain is given by_______________?
A. 2
B. 1
C. 1/2
D. 0
Answer» B. 1
Discussion
23.

Which of the following amplifier is used in a digital to analog converter?
A. Non inverter
B. Voltage follower
C. Summer
D. Difference amplifier
Answer» D. Difference amplifier
Discussion
24.

Differential amplifiers are used in______________?
A. Instrumentation amplifiers
B. Voltage followers
C. Voltage regulators
D. Buffers
Answer» B. Voltage followers
Discussion
25.

When a step-input is given to an op-amp integrator, the output will be______________?
A. A ramp
B. A sinusoidal wave
C. A rectangular wave
D. A triangular wave with dc bias
Answer» B. A sinusoidal wave
Discussion
26.

In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db & 2db respectively, then its common mode rejection ratio is________________?
A. 23dB
B. 25dB
C. 46dB
D. 50dB
Answer» B. 25dB
Discussion