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AllInfoHub – MCQ Practice

Electronic Devices and Circuits – Multiple Choice Questions (MCQs)

  1. 25. The common-mode rejection ratio (CMRR) of an Op-Amp measures its ability to reject:

    • A. Differential signals
    • B. Common-mode signals
    • C. Noise signals
    • D. Input offset voltage

  2. 26. An Op-Amp used in an inverting amplifier configuration has an output that is ________ the input.

    • A. In phase with
    • B. 180 degrees out of phase with
    • C. 90 degrees out of phase with
    • D. 270 degrees out of phase with

  3. 27. A voltage follower Op-Amp circuit provides a voltage gain of approximately:

    • A. 0
    • B. 1
    • C. Infinite
    • D. Negative

  4. 28. The bandwidth of an Op-Amp based amplifier can be increased by using:

    • A. Higher gain
    • B. Negative feedback
    • C. Positive feedback
    • D. Larger input signals

  5. 29. Clippers and clampers are types of:

    • A. Amplifiers
    • B. Filters
    • C. Wave-shaping circuits
    • D. Rectifiers

  6. 30. A clipper circuit is used to:

    • A. Limit the amplitude of a signal
    • B. Shift the DC level of a signal
    • C. Amplify a signal
    • D. Filter out noise

  7. 31. Which of the following is a characteristic of an ideal diode?

    • A. Zero forward resistance
    • B. Infinite reverse resistance
    • C. Zero voltage drop in forward bias
    • D. All of the above

  8. 32. The ripple factor of a full-wave rectifier is approximately:

    • A. 0.482
    • B. 1.21
    • C. 0.812
    • D. 0.6

  9. 33. The peak inverse voltage (PIV) of a full-wave center-tapped rectifier is:

    • A. Vm
    • B. 2Vm
    • C. Vm/2
    • D. 4Vm

  10. 34. The purpose of a bypass capacitor in a common emitter amplifier is to:

    • A. Increase voltage gain
    • B. Reduce voltage gain
    • C. Increase current gain
    • D. Provide DC path for bias

  11. 35. The relationship between alpha and beta in a BJT is:

    • A. β = α / (1 - α)
    • B. α = β / (1 + β)
    • C. β = α + 1
    • D. α = β - 1

  12. 36. An LED emits light when it is:

    • A. Reverse biased
    • B. Forward biased
    • C. Unbiased
    • D. Heated

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