power electronics MCQs – Page 12

Practise focused power electronics questions with marked answers for exam preparation and subject revision.

power electronics Mcqs
221. What happen due to high di / dt____________?
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A. None of these

B. Insulation failure

C. Breakdown of junction

D. Local hot spot
222. A thyristor equivalent of a thyratron tube is a _________?
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A. None of above

B. Diac

C. Silicon controlled-rectifier SCR

D. Triac

223. In a three phase voltage source inverters____________?
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A. Only amplitude of voltage is controllable

B. Only phase is controllable

C. Both amplitude and phase is controllable

D. Amplitude, phase and frequency of voltages should always be controllable
224. Which of the following is used in SCR to protect from high dV / dt__________________?
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A. Snubber circuit

B. Circuit breaker

C. Equalizing circuit

D. Fuse

225. In rectifiers, load current flow is_________?
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A. Either (a) or (b)

B. Bidirectional

C. Non directional

D. Unidirectional
226. Anode of an operational SCR is _______________?
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A. Always negative w.r.t cathode

B. Always negative w.r.t anode

C. Always positive w.r.t cathode

D. Always positive w.r.t anode

227. For series connected SCRaEURs dynamic equalising circuit consists of___________?
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A. R and C in series but with diode across C

B. R and C in series but with diode across R

C. Series R and diode with C across R

D. Series R and diode with C across R