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Rectifiers and Converters - Interview Questions and Answers

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26. In selenium rectifiers efficiencies ranging from ______ to ______ percent are attainable
A. 25, 35
B. 40, 50
C. 60, 70
D. 75, 85
Explanation:
27. The efficiency of an electrolytic rectifier is nearly
A. 80%
B. 70%
C. 60%
D. 40%
Explanation:
28. In a phase-shift control method, the phase shift between anode and grid voltages can be achieved by means of
A. shunt motor
B. synchronous motor
C. induction regulator
D. synchronous generator
Explanation:
29. In a mercury arc rectifier______ flow from anode to cathode
A. ions
B. electrons
C. ions and electrons
D. any of the above
Explanation:
30. In a mercury arc rectifier characteristic blue luminosity is due to
A. colour of mercury
B. ionization
C. high temperature
D. electron streams
Explanation:
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