ETC EngineeringMCQs
Home

Freewheeling Operation MCQs

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

Question 1
Power ElectronicsFreewheeling Operation

For an RL load, a freewheeling diode can improve load-current continuity by conducting when?

  • AThe main rectifier path no longer supplies the inductive current
  • BThe load inductance becomes zero
  • CThe AC source is permanently disconnected
  • DThe gate pulse is at its maximum only
Report an error
Correct Answer: A. The main rectifier path no longer supplies the inductive current
Explanation: Stored magnetic energy in the load inductance maintains current through the freewheeling diode when the source-side device stops conducting.
Reference: Standard power electronics: freewheeling operation
Question 2
Power ElectronicsFreewheeling Operation

When an ideal freewheeling diode conducts across an RL load, the load voltage is approximately?

  • AZero
  • BEqual to the negative supply peak
  • CTwice the supply peak
  • DInfinite
Report an error
Correct Answer: A. Zero
Explanation: The conducting ideal diode effectively shorts the load terminals for the freewheeling interval, making load voltage approximately zero while current circulates.
Reference: Standard power electronics: freewheeling operation
Question 3
Power ElectronicsFreewheeling Operation

One important benefit of a freewheeling diode in an inductive rectifier load is reduction of?

  • ANegative load-voltage excursions
  • BAverage load current to zero
  • CLoad inductance
  • DSupply frequency
Report an error
Correct Answer: A. Negative load-voltage excursions
Explanation: The diode provides a local current path and clamps the load voltage near zero during freewheeling, preventing substantial negative load voltage.
Reference: Standard power electronics: freewheeling operation