Power Electronics A UJT has ___________. Three pn junctions One pn junction None of these Two pn junctions Three pn junctions One pn junction None of these Two pn junctions ANSWER DOWNLOAD EXAMIANS APP
Power Electronics Example of a voltage clamping device metal oxide varistor. aluminium block. snubber circuit. fast acting fuse. metal oxide varistor. aluminium block. snubber circuit. fast acting fuse. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt? 1200 V/µs. 600 V/µs. 1000 V/µs. 800 V/µs. 1200 V/µs. 600 V/µs. 1000 V/µs. 800 V/µs. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics Compared to transistor, ______________ have lower on state conduction losses and higher power handling capability TRIACs. MOSFETs. Thyristor. Semi conductor diodes. TRIACs. MOSFETs. Thyristor. Semi conductor diodes. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics The turn-on time of an SCR with inductive load is 20 µs. The puls train frequency is 2.5 KHz with a mark/space ratio of 1/10, then SCR will Turn on if pulse frequency us increased to two times. Turn on. Not turn on. Turn on if inductance is removed. Turn on if pulse frequency us increased to two times. Turn on. Not turn on. Turn on if inductance is removed. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is 60° to 120°. 60° to 180°. 30° to 150°. 30° to 180°. 60° to 120°. 60° to 180°. 30° to 150°. 30° to 180°. ANSWER DOWNLOAD EXAMIANS APP
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