Power Electronics MCQ Questions and Answers Quiz

71. A diac has …………… pn junctions

  1. Two
  2. Three
  3. Four
  4. None of the above

72. A diac has ……………… semiconductor layers

  1. Two
  2. Four
  3. Three
  4. None of the above

73. A diac is …………………. switch

  1. A d.c.
  2. A mechanical
  3. An c.
  4. None of the above

74. A diac is simply ………………

  1. A three junction device
  2. A triac without gate terminal
  3. A single junction device
  4. None of the above

75. A diac is turned on by …………………

  1. Gate voltage
  2. Gate current
  3. A breakover voltage
  4. None of the above

76. A full wave rectifier with resistive load produces

  1. Third harmonic
  2. Fifth harmonic
  3. Second harmonic
  4. Do not produce harmonics

77. A triac can pass a portion of …………… half-cycle through the load

  1. Only negative
  2. Both positive and negative
  3. Only positive
  4. None of the above

78. A triac has …………….. semiconductor layers

  1. Three
  2. Four
  3. Two
  4. Five

79. 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

80. A triac is a …………. switch

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