Electronics Engineering MCQs

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The load circuit of a single phase full bridge inverter

  • A. must be underdamped
  • B. must be overdamped
  • C. may be underdamped or overdamped
  • D. may be any type of load
  • Correct Answer: Option D

When a single phase dual converter is operating in circulating current mode

  • A. both converters are working as rectifiers simultaneously
  • B. one converter is always working as rectifier and the other as inverter
  • C. only one converter is working at one time
  • D. both converters are either working as rectifiers or as inverters simultaneously
  • Correct Answer: Option B

To turn off an SCR, it is necessary to reduce its current to less than :

  • A. trigger current
  • B. holding current
  • C. breakover current
  • D. none of the above
  • Correct Answer: Option B

Class A and class B chopper

  • A. operate in first quadrant
  • B. operate in second quadrant
  • C. class A chopper operates in first quadrant while class B operates in second quadrant
  • D. may operate in either first or second quadrant
  • Correct Answer: Option C

Assertion (A): Light triggering is very suitable for HVDC transmission. Reason (R): Light triggering has the advantage of complete electrical isolation of gate circuit.

  • A. Both A and R are correct and R is correct explanation of A
  • B. Both A and R correct but R is not correct explanation of A
  • C. A is correct but R is wrong
  • D. A is wrong but R is correct
  • Correct Answer: Option A

In a modified series inverter

  • A. the maximum output frequency is less than frequency of damped oscillations
  • B. the output frequency can be even higher than the frequency of damped oscillations
  • C. the output frequency cannot exceed the frequency of damped oscillations
  • D. any of the above
  • Correct Answer: Option B

The number of layers in a Shockley diode are

  • A. 2
  • B. 3
  • C. 4
  • D. 2 or 3
  • Correct Answer: Option C

In a modified series inverter with two inductors and two capacitors, the load current

  • A. has 2 parallel paths
  • B. has only one parallel path
  • C. can have three parallel paths
  • D. has four parallel paths
  • Correct Answer: Option A

In a bridge inverter with single pulse width modulation

  • A. the output frequency is equal to frequency of reference signal
  • B. the output frequency is equal to frequency of control signal
  • C. either (a) or (b)
  • D. neither (a) nor (b)
  • Correct Answer: Option A

In a single phase half wave ac regulator feeding a resistive load, the rms load current

  • A. is always positive
  • B. may be positive or negative
  • C. is always negative
  • D. can be even zero
  • Correct Answer: Option A