Power Electronics MCQ Multiple Choice Questions Answers - Page 3 for Practice

61. Voltage commutation circuit can be converted into a current commutation by interchanging the positions of

62. When a UJT is turned ON, the resistance between emitter terminal and lower base terminal.................................

63. When the emitter terminal of a UJT is open, the resistance between the base terminal is generally .......................

64. When the temperature increases, the inter-base resistance (RBB) of a UJT ......................

65. When the temperature increases, the intrinsic stand off ratio ....................

66. Which of the following is not a characteristic of UJT?

67. With increase in firing angle

68. A crowbar is a circuit which is used to protect a

69. A diac has ................... terminals

70. A diac has …………… pn junctions

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

72. A diac is …………………. switch

73. A diac is simply ………………

74. A diac is turned on by …………………

75. A full wave rectifier with resistive load produces

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

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

78. A Triac has three terminals viz ………………

79. A triac is a …………. switch

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

81. A UJT has ……………….

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

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

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

85. An SCR can be used

86. An SCR is made up of silicon because

87. Between the incoming and outgoing devices in voltage commutation

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

89. Double fourier series analysis of PWM is

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


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