Power Electronics MCQ Questions and Answers Quiz

41. Silicon controlled rectifier can be turned on

  1. And turned off by applying gate pulse
  2. By applying a gate pulse and turned off by removing the gate pulse
  3. By applying a gate pulse and turned off only when current becomes zero
  4. By making current non zero and turned off by making current zero

42. Single phase VSI are mainly used in

  1. Ups
  2. Multilevel configuration
  3. Power supplies
  4. All of these

43. The advantage of using free - wheeling diode in half controlled bridge converter is that

  1. There is always a path for the ac current independent of the ac line
  2. There is always a path for the dc current dependent of the ac line
  3. There is always a path for the dc current independent of the ac line
  4. There is always a path for the ac current independent of the ac line

44. The conduction losses in IGBT is

  1. Lower than that of MOSFET
  2. Equal to that of MOSFET
  3. More than that of MOSFET
  4. Equal to that of BJT

45. The device that does not have the gate terminal is ............................

  1. FET
  2. SCR
  3. Triac
  4. Diac

46. The device that exhibits negative resistance region is .........................

  1. Triac
  2. Transistor
  3. Diac
  4. UJT

47. The effects of EMI can be reduced by

  1. Reducing the efficiency of the coupling path
  2. Reducing the susceptibility of the receptor
  3. Suppressing emissions
  4. All of these

48. The input current waveform of a bridge controlled rectifier when the load is perfectly filtered is

  1. Square wave
  2. Saw - tooth wave
  3. Sine wave
  4. Trapezoidal wave

49. The most suited gate pulses given to the AC regulator with R - L load can be in the form of

  1. Large isolating pulse transformer
  2. A train of pulses
  3. Continuous signal
  4. None of these

50. The normal way to turn on a diac is by ...........................

  1. Gate voltage
  2. Breakover voltage
  3. Gate current
  4. None of the above
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MCQ Multiple Choice Questions and Answers on Power Electronics

Power Electronics Question and Answer