Power Electronics Multiple Choice Questions and Answers

71. A diac has ……………… semiconductor layers

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

72. A diac is …………………. switch

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

73. 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

74. A diac is turned on by …………………

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

75. A full wave rectifier with resistive load produces

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

76. 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

77. A triac has …………….. semiconductor layers

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

78. 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

79. A triac is a …………. switch

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

80. A triac is equivalent to two SCRs …………..

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