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AC Bridges MCQs

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

Question 1
Measurements & InstrumentationAC Bridges

A Maxwell bridge is commonly used to measure an unknown?

  • AInductance
  • BCapacitance only
  • CFrequency only
  • DDC voltage
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Correct Answer: A. Inductance
Explanation: The Maxwell bridge determines an unknown inductance by comparison with known resistance and capacitance standards.
Reference: Standard measurements and instrumentation: ac bridges
Question 2
Measurements & InstrumentationAC Bridges

A Schering bridge is commonly used for measurement of?

  • ACapacitance and dielectric loss
  • BInductance only
  • CDC current only
  • DMechanical displacement
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Correct Answer: A. Capacitance and dielectric loss
Explanation: The Schering bridge is widely used for capacitance measurement and evaluation of dielectric loss or dissipation factor.
Reference: Standard measurements and instrumentation: ac bridges
Question 3
Measurements & InstrumentationAC Bridges

A Wien bridge is well known for measurement of?

  • AFrequency
  • BVery low resistance
  • CDC current
  • DMagnetic flux only
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Correct Answer: A. Frequency
Explanation: The Wien bridge uses frequency-dependent RC arms and is commonly used for audio-frequency measurement and oscillator circuits.
Reference: Standard measurements and instrumentation: ac bridges
Question 4
Measurements & InstrumentationAC Bridges

In an AC bridge at balance, the detector current is ideally?

  • AZero
  • BMaximum
  • CEqual to supply current
  • DAlways 1 A
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Correct Answer: A. Zero
Explanation: At bridge balance the detector terminals are at equal potential, so ideally no detector current flows.
Reference: Standard measurements and instrumentation: ac bridges