Operational Amplifier MCQ Questions – Op Amp MCQs

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Operational amplifiers abbreviated as op-amps are named so because in the beginning these were used primarily to perform mathematical
operations such as addition, subtraction, integration, and differentiation. In old days, op-amps were made using vacuum tubes. Modern Op-Amps are integrated circuits that operate on low dc supply voltages. Present days Op-amps are reliable and inexpensive devices. Given below are the most important basic Operational Amplified MCQ Questions with brief explanatory answers and solutions.

The ideal OP-AMP has the following characteristics

The ideal OP-AMP has the following characteristics

  1. Ri = ∞, AV = ∞, RO = 0
  2. Ri = ∞, AV = ∞, RO = ∞
  3. Ri = 0, AV = ∞, RO = 0
  4. Ri = 0, AV = 0, RO = ∞

Correct answer: 1. Ri = ∞, AV = ∞, RO = 0

In the common mode Op-amp

In the common mode Op-amp:

  1. An identical signal appears on both the inputs
  2. Both inputs are grounded
  3. The output signal are in-phase
  4. The outputs are connected together

Correct answer: 1. An identical signal appears on both the inputs

In case of an ideal OP-amp

In case of an ideal OP-amp:

  1. The current from output terminal is zero
  2. The current into the input terminals is zero
  3. The differential voltage across the input terminals is zero
  4. The output resistance is zero

Correct answer: 1. The current from output terminal is zero

The common mode gain of Op-amp is

The common mode gain of Op-amp is:

  1. Always unity
  2. Very high
  3. Very low
  4. Unpredictable

Correct answer: 3. Very low

The tail current in a differential amplifier equals

The tail current in a differential amplifier equals:

  1. Collector current divided by current gain
  2. Collector voltage divided by collector resistance
  3. Difference between two emitter currents
  4. Sum of two emitter currents

Correct answer: 1. Sum of two emitter currents

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