Power Electronics MCQ Questions and Answers Quiz

11. A Triac has three terminals viz.....................

  1. Two main terminal and a gate terminal
  2. Cathode, anode, gate
  3. Drain, source, gate
  4. None of the above

12. A triac is a ................ switch

  1. Unidirectional
  2. Mechanical
  3. Bidirectional
  4. None of the above

13. A triac is equivalent to two SCRs .......................

  1. In series
  2. In inverse-parallel
  3. In parallel
  4. None of the above

14. A UJT has ....................

  1. One pn junction
  2. Three pn junctions
  3. Two pn junctions
  4. None of the above

15. A UJT is sometimes called................ diode

  1. High resistance
  2. Single-base
  3. Low resistance
  4. Double-base

16. AC power in a load can be controlled by using

  1. two SCRs in series
  2. three SCRs in series
  3. two SCRs in parallel opposition
  4. four SCRs in series

17. After peak point, the UJT operates in the ................... region

  1. Saturation
  2. Negative resistance
  3. Cut-off
  4. None of the above

18. An SCR can be used

  1. for power control
  2. for speed control of dc shunt motor
  3. as static conductor
  4. all of these

19. An SCR is made up of silicon because

  1. silicon has small leakage current than germanium
  2. silicon has small leakage voltage than germanium
  3. silicon has large leakage current than germanium
  4. silicon has large leakage voltage than germanium

20. Between the incoming and outgoing devices in voltage commutation

  1. Small overlapping operation
  2. No overlapping operation
  3. Large overlapping takes place
  4. None of these
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MCQ Multiple Choice Questions and Answers on Power Electronics

Power Electronics Question and Answer