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Power Electronics MCQs | Page - 27

Dear candidates you will find MCQ questions of Power Electronics here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.

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Q. 261) In the basic series inverter circuit, the source supplies load

(A) only in positive half cycle
(B) both in positive and negative half cycles
(C) only in part of positive half cycle
(D) in positive half cycle and part of negative half cycle
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Q. 262) The specified maximum junction temperature of thyristors is about

(A) 50°C
(B) 80°C
(C) 120°C
(D) 200°C
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Q. 263) A half bridge inverter

(A) needs a 3 wire dc supply
(B) may use a two wire or 3 wire dc supply
(C) has higher output voltage if fed from 3 wire dc supply
(D) has higher efficiency if fed from 3 wire dc supply
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Q. 264) A 3 phase series inverter has

(A) 12 thyristors
(B) 6 thyristors
(C) 3 thyristors
(D) 3 or 6 thyristors
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Q. 265) Surge current rating of an SCR is

(A) the maximum repetitive surge current in which the SCR can withstand
(B) the maximum non-repetitive surge current in which the SCR can withstand
(C) the maximum repetitive or non repetitive surge current in which the SCR can withstand
(D) the maximum surge current in which the SCR can withstand if both surge current and steady current exist together
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Q. 266) Which of the following devices has metal-silicon junction?

(A) General purpose power diode
(B) Schottky diode
(C) SCR
(D) MOSFET
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Q. 267) In thermal ohm's law, temperature and power loss are analogous to

(A) V and I respectively of ohm's law
(B) I and V respectively of ohm's law
(C) R and V respectively of ohm's law
(D) I and R respectively of ohm's law
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Q. 268) A string of series connected thyristors needs equalising circuit to

(A) ensure proper firing
(B) ensure proper current division
(C) ensure proper voltage division
(D) none of the above
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Q. 269) The minimum gate current which can turn on SCR is called :

(A) trigger current
(B) holding current
(C) junction current
(D) breakover current
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Q. 270) Which of these devices can conduct in both directions?

(A) SCR
(B) SUS
(C) SBS
(D) UJT
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