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This mock test of OP–amp Nat Level – 1 for IIT JAM helps you for every IIT JAM entrance exam.
This contains 10 Multiple Choice Questions for IIT JAM OP–amp Nat Level – 1 (mcq) to study with solutions a complete question bank.
The solved questions answers in this OP–amp Nat Level – 1 quiz give you a good mix of easy questions and tough questions. IIT JAM
students definitely take this OP–amp Nat Level – 1 exercise for a better result in the exam. You can find other OP–amp Nat Level – 1 extra questions,
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*Answer can only contain numeric values

QUESTION: 1

A bistable multi vibrator with a saturation voltage 15Vis shown in the diagram. The magnitude of the positive and negative thresholds at the inverting terminal for which the multi vibrator will switch to the other state are in volts (up to 2 decimal places).

Solution:

The threshold voltage is

where

The correct answer is: 0.45

*Answer can only contain numeric values

QUESTION: 2

A certain Op-Amp has bias currents of 50μA and 49.3μA. The input offset current is (in nA).

Solution:

The input offset current is the different of input bias currents i.e.

The correct answer is: 700

*Answer can only contain numeric values

QUESTION: 3

A certain non-inverting amplifier has an R_{i }equa l to 1.0kΩ and R_{f} . equal to 1.0kΩ.

The close loop gain is :

Solution:

The correct answer is: 101

*Answer can only contain numeric values

QUESTION: 4

The Common Mode Rejection Ratio (CMRR) of a differential amplifier using an operational amplifier is 100 dB. The output voltage for a differential input of is 2V. The common mode gain is (in dB)

Solution:

Where A_{d} = differential voltage gain

= large signal voltage gains

= Common mode voltage gain

The **CMRR** is generally expressed is **dB and** denoted by

The correct answer is: 0.1

*Answer can only contain numeric values

QUESTION: 5

If a certain Op-Amp has a mid range open-loop gain of 200000 and a unity-gain frequency of 5MHz, the gain bandwidth product in Hz is :

Solution:

gain bandwidth product = frequency at which gain is unity

= 5 MHz

= 5000000 Hz

The correct answer is: 5000000

*Answer can only contain numeric values

QUESTION: 6

A certain Op-Amp has three terminal amplifier stages with the following gains

Stage I : A_{v1} = 40 dB

Stage I : A_{v2} = 32 dB

Stage I : A_{v3} = 20 dB

The open-loop mid range gain in decibels?

Solution:

The correct answer is: 92

*Answer can only contain numeric values

QUESTION: 7

The output V_{0} of the ideal Op-Amp circuit shown in the figure is (in Volts)

Solution:

The correct answer is: -7

*Answer can only contain numeric values

QUESTION: 8

Given the Op-Amp configuration is given figure below, the value of the R_{f} required to produce a closed - loop voltage gain of-100. (in kΩ).

Solution:

The correct answer is: 220

*Answer can only contain numeric values

QUESTION: 9

The gain of the amplifier shown in figure. The open loop voltage gain of the Op-Amp is 1,00,000.

This is a non-inverting Op-Amp configuration. Therefore, the closed loop voltage gain is

Solution:

This is a non-inverting Op-Amp configuration. Therefore, the closed loop voltage gain is

= 22.3

The correct answer is: 22.3

*Answer can only contain numeric values

QUESTION: 10

The output voltage of a certain Op-Amp appears as shown in figure in response to a step input. What is the slew rate (in V/μs)

Solution:

The output goes from the lower to the upper limit. Since, this response is not ideal, the limit are taken at the 90% points, as indicated. So the upper limit is + 9Vand the lower limit is - 9V. The slew rate is

= 18 V/μs

The correct answer is: 18

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