OP Amp MCQ Questions & Answers | Electrical Engineering

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A differential amplifier is invariably used in the input 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

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Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

With zero volts on both inputs, an OP-amp ideally should have an output ___________

A) equal to the positive supply voltage B) equal to the negative supply voltage C) equal to zero D) equal to CMRR

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Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

The tail current of a differential amplifier is .

A) half of either collector current B) equal to either collector current C) two times either collector current D) equal to the difference in base currents

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Answer & Solution

Answer: Option C

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A differential amplifier has a differential gain of 20,000. CMRR = 80dB. The common mode gain is given by

A) 2 B) 1 C) $$\frac{1}{2}$$ D) 0

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Answer & Solution

Answer: Option A

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The use of negative feedback

A) reduces the voltage gain of an Op-amp B) makes the Op-amp oscillate C) makes linear operation possible D) A and B both

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Answer & Solution

Answer: Option D

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In the common mode, ___________

A) both inputs are grounded B) the outputs are connected together C) an identical signal appears on both the inputs D) the output signal are in-phase

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Answer & Solution

Answer: Option C

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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

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Answer & Solution

Answer: Option C

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OP-amp circuits may be cascaded without changing their input output relationships

A) True B) False

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Answer & Solution

Answer: Option A

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A common mode signal is applied to ___________

A) the noninverting input B) the inverting input C) both iputs D) top of the tail resistor

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Answer & Solution

Answer: Option C

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Differential amplifiers are used in

A) Instrumentation amplifiers B) Voltage followers C) Voltage regulators D) Buffers

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Answer & Solution

Answer: Option A

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