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Potentiometers MCQs

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

Question 1
Measurements & InstrumentationPotentiometers

A potentiometer is considered a null-type instrument because at balance it?

  • ADraws essentially no current from the source being measured through the detector branch
  • BAlways draws maximum current
  • CUses no reference voltage
  • DMeasures only resistance
Report an error
Correct Answer: A. Draws essentially no current from the source being measured through the detector branch
Explanation: At null balance there is no detector current, enabling accurate comparison without loading the measured source in the ideal case.
Reference: Standard measurements and instrumentation: potentiometers
Question 2
Measurements & InstrumentationPotentiometers

A DC potentiometer can be used to measure an unknown emf by?

  • AComparing it with a known reference under null condition
  • BMeasuring its frequency
  • CConverting it directly to inductance
  • DShort-circuiting the source
Report an error
Correct Answer: A. Comparing it with a known reference under null condition
Explanation: A potentiometer balances the unknown voltage against a calibrated potential drop derived from a reference.
Reference: Standard measurements and instrumentation: potentiometers