Rectifiers and Converters - Interview Questions | Exam2Win

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

A. They are mechanically strong

B. They do not require any voltage for filament heating

C. Both (a) and (b)

D. None of the above

Explanation:

32. Which of the following rectifiers have been used extensively in supplying direct current for electroplating ?

A. Copper oxide rectifiers

B. Selenium rectifiers

C. Mercury arc rectifiers

D. Mechanical rectifiers

Explanation:

33. 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

D. none of the above

Explanation:

34. If cathode and anode connections in a mercury arc rectifier are inter changed

A. the rectifier will not operate

B. internal losses will be reduced

C. both ion and electron streams will move in the same direction

D. the rectifier will operate at reduced efficiency

Explanation:

35. Which of the following statement is incorrect ?

A. Copper oxide rectifier is a linear device

B. Copper oxide rectifier is not a perfect rectifier

C. Copper oxide rectifier has a low efficiency

D. Copper oxide rectifier finds use in control circuits

Explanation:

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