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Electronics Engineering Objective Questions { Power Semiconductor Devices and Their Applications }

106. In a single-phase full converter, the number of SCRs conducting during overlap is
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107. In a 3-phase full converter, the output voltage is at a frequency equal to
A. supply frequency f
B. 2 f
C. 3 f
D. 6 f
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108. Which of the following 3-phase ac to de converter requires neutral point connection?
A. 3-phase semiconductor
B. 3-phase full converter
C. 3-phase halfwave converter
D. 3-phase full converter with diodes
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109. In a dual converter, converters 1 and 2 work as under
A. 1 as rectifier, 2 as inverter
B. both as rectifiers
C. both as inverters
D. none of these
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110. For a single-phase half-bridge, amplitude of output voltage is Vs and the output power is P. Then their corresponding values fora single phase full-bridge inverter are
A. Vs, P
B. Vs/2, P/2
C. 2Vs, 2P
D. V, 2P
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111. A single-phase full bridge inverter can operate in load-commutation mode in case load consists of
A. RLC overdamped
B. RLC underdamped
C. RLC critically damped
D. none of these
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112. In dc choppers, if Ton is the on period and f is the chopping frequency, then output voltage in terms of the input voltage V is given by
A. VsTon/f
B. Vs.ffron
C. Vs/(Fron)
D. Vsf, Ton
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