1. Power electronics involves conversion of: (a) Mechanical to electrical energy

Question

1. Power electronics involves conversion of:
(a) Mechanical to electrical energy
(b) Electrical to mechanical energy
(c) Electrical to electrical energy
(d) None of the above

6. In a converter operating in rectification mode
(a) Instantaneous power always flows from ac side to dc side
(b) Instantaneous power always flows from dc side to ac side
(c) Average power flows from ac side to dc side
(d) Average power flows from dc side to ac side

7. In a converter operating in inversion mode
(a) Instantaneous power always flows from ac side to dc side
(b) Instantaneous power always flows from dc side to ac side
(c) Average power flows from ac side to dc side
(d) Average power flows from dc side to ac side

Explanation / Answer

1) Option c is correct: Power electronic means conversion of AC power to DC power, DC Power to AC power,DC-DC and also AC-AC.. So that power electronic conversion menas converting electrical energy to electrical energy.

6)both option a and c are correct: but most dominating answer is option a: (so select option a): Rectification means converting AC power into DC power... it means AC has both instantaneous and average values, and the output of rectifier is pulsatind DC, it has some ac component . But the power flow is from always ac side to DC Side

7)option D is correct: Inverter converts DC to AC power, DC has only average value. so that power always flows from DC side to AC side.

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