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