Power Electronics Test Questions(Electrical Engineering Questions ) Questions and Answers

Question 1. A rectifier with an external low pass filter is an example of
  1.    Indirect switch matrix circuits
  2.    Direct switch matrix circuits
  3.    Embedded converters
  4.    All of these
Explanation:-
Answer: Option B. -> Direct switch matrix circuits
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2. IGBT stands for
  1.    Insulated gate bipolar transistor
  2.    Insulated gate bidirectional transistor
  3.    Inductive gate bipolar transistor
  4.    Inductive gate bidirectional transistor
Explanation:-
Answer: Option A. -> Insulated gate bipolar transistor
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 3. An ideal switch is
  1.    Lossless
  2.    Carry current in any direction when it is on
  3.    Does not carry any current in any direction when it is off
  4.    All of these
Explanation:-
Answer: Option D. -> All of these
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 4. In ac - dc conversion, when the switch is closed then the sum of voltages around the loop is
  1.    Zero
  2.    Non zero
  3.    Equal to the sum of voltage when switch is open
  4.    Twice of the voltage when switch is open
Explanation:-
Answer: Option B. -> Non zero
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 5. Number of PN junction in an SCR is
  1.    Two
  2.    Three
  3.    Four
  4.    Five
Explanation:-
Answer: Option B. -> Three
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 6. Anode of an operational SCR is
  1.    Always positive w.r.t cathode
  2.    Always negative w.r.t anode
  3.    Always positive w.r.t anode
  4.    Always negative w.r.t cathode
Explanation:-
Answer: Option A. -> Always positive w.r.t cathode
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 7. In a silicon controlled rectifier, the load is connected
  1.    Across anode
  2.    In series with anode
  3.    Across cathode
  4.    In series with cathode
Explanation:-
Answer: Option B. -> In series with anode
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 8. A single phase ac - dc converter is also known as
  1.    rectifier
  2.    inverter
  3.    chopper
  4.    regulator
Explanation:-
Answer: Option A. -> rectifier
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 9. In a full wave rectifier, the rectification ratio is approximately equal to
  1.    61%
  2.    71%
  3.    81%
  4.    91%
Explanation:-
Answer: Option C. -> 81%
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 10. If the gate voltage of an SCR is removed, then the
  1.    anode current decreases
  2.    anode current does not decrease at all
  3.    anode current increases
  4.    cathode current increases
Explanation:-
Answer: Option B. -> anode current does not decrease at all
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
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