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Test: Operations Amplifier - Electronics and Communication Engineering (ECE) MCQ


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10 Questions MCQ Test - Test: Operations Amplifier

Test: Operations Amplifier for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Test: Operations Amplifier questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: Operations Amplifier MCQs are made for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Operations Amplifier below.
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Test: Operations Amplifier - Question 1

What is the use of the compensation capacitor in op-amp?

Detailed Solution for Test: Operations Amplifier - Question 1

Compensation capacitor in the internal structure of op-amp to improve its frequency response, increasing its stability. It also decreases the slew rate of the op-amp.

Test: Operations Amplifier - Question 2

Which of the following option is correct according to the below statements?
A: Voltage gain of op-amp decreases at high frequencies
B: Its internal structure uses a capacitor

Detailed Solution for Test: Operations Amplifier - Question 2

The internal structure of an op-amp uses a compensation capacitor for stability purpose. It provides dominant pole compensation; thereby the op-amp remains stable. However, the op-amp gain remains constant at low frequencies but decreases at high frequencies due to a compensation capacitor.

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Test: Operations Amplifier - Question 3

Given that CMRR is 100dB. Input common-mode voltage is 12 V. Differential voltage gain is 4000. Calculate output common-mode voltage.

Detailed Solution for Test: Operations Amplifier - Question 3

CMRR = 20 log(AD/ACM) = 20 log(4000×12/Vocm) = 100
Log(48000/VOCM) = 5
48000/VOCM = 105
VOCM = 0.48V.

Test: Operations Amplifier - Question 4

A practical op-amp has a bandwidth of only 10 Hz. Gain is 106, and the required bandwidth is 100 kHz. How much feedback is required?

Detailed Solution for Test: Operations Amplifier - Question 4

B2 = B1(1+βA) = 10(1+β106) = 100k
1 + β106 = 10k
β = 9.999×10-3
In percentage, feedback β = 0.99% negative feedback.

Test: Operations Amplifier - Question 5

In the given block diagram of an op-amp. What are A, B, C and D?

Detailed Solution for Test: Operations Amplifier - Question 5

The correct block diagram is

Test: Operations Amplifier - Question 6

Till what frequency do we get amplification from IC 741?

Detailed Solution for Test: Operations Amplifier - Question 6

The 3dB frequency is the cut-off frequency, where the gain is 1√2 of the maximum. The gain is only constant for infinite frequency, that is, has infinite bandwidth if the op-amp is ideal, which practically doesn’t exist. The UGB is the point at which the gain of op-amp reaches 1.

Test: Operations Amplifier - Question 7

The unity gain bandwidth for an op-amp having open loop gain 2×106 is 10 Mhz. Calculate the AC gain of op-amp at an input of 2000 Hz.

Detailed Solution for Test: Operations Amplifier - Question 7

UGB = AOLfOL
fOL = 10M/2×106 = 5Hz
The AC gain |A| = 
|A| = 2×106/400 = 5000.

Test: Operations Amplifier - Question 8

Given that for an op-amp the gain is 103, the slew rate is 1.5V/μsec. Input is 5×10-3sinωt, calculate maximum frequency to prevent distortion.

Detailed Solution for Test: Operations Amplifier - Question 8

dVOUT(max)/dT =< Slew rate
A.Vmω =< 1.5 V/μsec
103.5.10-3.ω = < 1.5×106
ω=<0.3×106
Frequency f = 0.0477×106Hz.

Test: Operations Amplifier - Question 9

In an ideal op-amp, which is not true?

Detailed Solution for Test: Operations Amplifier - Question 9

For an ideal op-amp, the open loop voltage gain is infinite. The output resistance is 0 and the input resistance is infinite. Op-amp has zero input current, zero offset voltage, infinite bandwidth, infinite CMRR and infinite slew rate.

Test: Operations Amplifier - Question 10

Which of these is incorrect for an operational amplifier?

Detailed Solution for Test: Operations Amplifier - Question 10

Operational amplifier is a high voltage gain, direct coupled amplifier which can be used to perform mathematical operations on analog signals. It can be used to amplify both DC and AC signals.

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