Power Electronics Quizzes | Trivia Quiz for Practice

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

81. A UJT has ……………….

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

82. A UJT is sometimes called …………. diode

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

83. 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

84. After peak point, the UJT operates in the ……………. region

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

85. 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

86. 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

87. 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

88. Between the peak point and the valley point of UJT emitter characteristics we have ………….. region

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

89. Double fourier series analysis of PWM is

1. Three dimensional functions
2. One dimensional functions
3. Two dimensional functions
4. All of these

90. During the commutation period in 3 phase converter, overlap time is

1. Dependent on the voltage
2. Dependent on both the load current and load voltage behind the short circuit current
3. Dependent on the load current
4. Independent on both the load current and load voltage