Electrical Engineering MCQs

Page No. 175

Which of the following statement is incorrect ?


aCopper oxide rectifier is a linear device


bCopper oxide rectifier is not a perfect rectifier


cCopper oxide rectifier has a low efficiency


dCopper oxide rectifier finds use in control circuits



In phase-shift control method the control is carried out by varying the of grid voltage


a magnitude


b polarity


c phase


dany of the above


View Answer phase

The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ?


aThey are mechanically strong


bThey do not require any voltage for filament heating


cBoth (A) and (B)


d None of the above


View Answer Both (A) and (B)

Copper oxide rectifier is usually designed not to operate above___________?


a10°C


b20°C


c30°C


d 45°C


View Answer 45°C

Ageing of a selenium rectifier may change the output voltage by__________?


a 5 to 10 per cent


b 15 to 20 per cent


c 25 to 30 per cent


dnone of the above


View Answer 5 to 10 per cent

The efficiency of the copper oxide rectifier seldom exceeds____________?


a90 to 95%


b 85 to 90%


c80 to 85%


d 65 to 75%


View Answer 65 to 75%

Selenium rectifier can be operated at temperatures as high as____________?


a25°C


b40°C


c60°C


d75°C


View Answer 75°C

The applications of selenium rectifiers are usually limited to potential of_____________?


a10 V


b30 V


c60 V


d 100 V


View Answer 100 V

In selenium rectifiers efficiencies ranging from _______ to _______ percent are attainable?


a25, 35


b 40, 50


c 60, 70


d75, 85


View Answer 75, 85

A commutating rectifier consists of commutator driven by___________?


a an induction motor


ba synchronous motor


ca D.C. series motor


da D.C. shunt motor


View Answer a synchronous motor

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