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Analog Signal Processing MCQs

Practice Analog Signal Processing MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1
Analog ElectronicsAnalog Signal Processing

A sample-and-hold circuit uses a capacitor primarily to?

  • AStore the sampled analog voltage between sampling instants
  • BGenerate a clock without any switch
  • CIncrease transistor beta
  • DRectify the input continuously
Report an error
Correct Answer: A. Store the sampled analog voltage between sampling instants
Explanation: During sample mode the capacitor charges to the input level; during hold mode it retains that voltage as closely as practical.
Reference: Standard analog electronics: sample-and-hold
Question 2
Analog ElectronicsAnalog Signal Processing

In a sample-and-hold circuit, droop rate refers to?

  • AThe gradual change of held output voltage with time
  • BThe sampling frequency itself
  • CThe instantaneous input resistance only
  • DThe op-amp open-loop gain
Report an error
Correct Answer: A. The gradual change of held output voltage with time
Explanation: Leakage currents and finite storage cause the held capacitor voltage to change slowly; this rate is called droop.
Reference: Standard analog electronics: sample-and-hold droop
Question 3
Analog ElectronicsAnalog Signal Processing

An analog multiplier whose output is proportional to Vx times Vy can be used as a frequency doubler by applying the same sinusoid to both inputs because sin^2(theta) contains?

  • AA DC term and a component at twice the input frequency
  • BOnly the original frequency
  • COnly a component at half the frequency
  • DNo AC component
Report an error
Correct Answer: A. A DC term and a component at twice the input frequency
Explanation: sin²(theta)=[1-cos(2theta)]/2, so squaring a sinusoid produces a DC term and a second-harmonic component.
Reference: Standard analog electronics: analog multiplier
Question 4
Analog ElectronicsAnalog Signal Processing

The RMS-to-DC converter is designed primarily to produce a DC output proportional to?

  • AThe RMS value of the input signal
  • BOnly the positive peak
  • COnly the average frequency
  • DThe input phase angle
Report an error
Correct Answer: A. The RMS value of the input signal
Explanation: An RMS-to-DC converter performs the nonlinear operations needed to represent the effective or heating value of an AC waveform as a DC level.
Reference: Standard analog electronics: RMS-to-DC conversion
Question 6
Analog ElectronicsAnalog Signal Processing

In an analog sample-and-hold circuit, acquisition time is the time required after entering sample mode for the held voltage to?

  • ASettle sufficiently close to the input value
  • BDecay completely to zero
  • CReach the supply voltage regardless of input
  • DComplete one oscillation cycle
Report an error
Correct Answer: A. Settle sufficiently close to the input value
Explanation: Acquisition time measures how long the circuit needs to charge its hold capacitor and settle to the new sampled input within a specified error.
Reference: Standard analog electronics: sample-and-hold acquisition time