Test: Operational Amplifiers

# Test: Operational Amplifiers

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## 20 Questions MCQ Test RRB JE for Electrical Engineering | Test: Operational Amplifiers

Test: Operational Amplifiers for Electronics and Communication Engineering (ECE) 2022 is part of RRB JE for Electrical Engineering preparation. The Test: Operational Amplifiers questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: Operational Amplifiers MCQs are made for Electronics and Communication Engineering (ECE) 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Operational Amplifiers below.
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Test: Operational Amplifiers - Question 1

### For the circuit shown in fig. the input resistance is

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Since op-amp is ideal

Test: Operational Amplifiers - Question 2

### In the circuit of fig. the op-amp slew rate is SR = 0.5 V/μs. If the amplitude of input signal is 0.02 V, then the maximum frequency that may be used is

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Test: Operational Amplifiers - Question 3

### In the circuit of fig. the input offset voltage and input offset current are Vio = 4 mV and Iio = 150 nA. The total output offset voltage is

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Test: Operational Amplifiers - Question 4

io = ?

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Test: Operational Amplifiers - Question 5

If ‘V’ is the voltage phasor and ‘I’ is the current phasor, then VI represents

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Apparent Power (S): It is defined as the product of r.m.s value of voltage (V) and current (1). It is denoted by S. S = V/I Volt Ampere

Test: Operational Amplifiers - Question 6

Consider the circuit shown below

Que: If vi = -2 V, then output vo is

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If vi < 0, then v0 > 0, D1 blocks and D2 conducts

Test: Operational Amplifiers - Question 7

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Voltage follower v0 = v = v+

Test: Operational Amplifiers - Question 8

The circuit shown in fig. is at steady state before the switch opens at t = 0. The vc(t) for t > 0 is

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For t > 0 the equivalent circuit is shown in fig.

Test: Operational Amplifiers - Question 9

The LED in the circuit of fig. will be on if vis

Detailed Solution for Test: Operational Amplifiers - Question 9

When v+ > 5 V, output will be positive and LED will be on. Hence (C) is correct.

Test: Operational Amplifiers - Question 10

In the circuit of fig. the CMRR of the op-amp is 60 dB. The magnitude of the vo is

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Test: Operational Amplifiers - Question 11

The analog multiplier X of fig. has the characteristics vp = v1v2 The output of this circuit is

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v+ = 0 = v-

Test: Operational Amplifiers - Question 12

If the input to the ideal comparator shown in fig. is a sinusoidal signal of 8 V (peak to peak) without any DC component, then the output of the comparator has a duty cycle of

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When vi > 2 V, output is positive. When vi < 2 V, output is negative.

Test: Operational Amplifiers - Question 13

In the op-amp circuit given in fig. the load current iL is

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Test: Operational Amplifiers - Question 14

In the circuit of fig. output voltage is |vo| =1 V for a certain set of ω, R, an C. The |vo| will be 2 V if

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This is a all pass circuit

Thus when ω and R is changed, the transfer function is unchanged

Test: Operational Amplifiers - Question 15

In the circuit of fig. the 3 dB cutoff frequency is

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Test: Operational Amplifiers - Question 16

The phase shift oscillator of fig. operate at f = 80 kHz. The value of resistance RF is

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The oscillation frequency is

Test: Operational Amplifiers - Question 17

The value of C required for sinusoidal oscillation of frequency 1 kHz in the circuit of fig. is

Detailed Solution for Test: Operational Amplifiers - Question 17

This is Wien-bridge oscillator. The ratio    is greater than 2. So there will be
oscillation

Test: Operational Amplifiers - Question 18

In the circuit shown in fig. the op-amp is ideal. If βF = 60, then the total current supplied by the 15 V source is

Detailed Solution for Test: Operational Amplifiers - Question 18

v+ = 5V = v = VE ,

The input current to the op-amp is zero.

Test: Operational Amplifiers - Question 19

In the circuit in fig. both transistor Q1 and Q2 are identical. The output voltage at T = 300 K is

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Test: Operational Amplifiers - Question 20

In the op-amp series regulator circuit of fig. Vz = 62. V, VBE = 0.7 V and β = 60. The output voltage vo is

Detailed Solution for Test: Operational Amplifiers - Question 20

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## RRB JE for Electrical Engineering

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