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Rectifiers and Converters - Interview Questions and Answers

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36. Which of the following mercury arc rectifier will deliver least undulating current?
A. Six-phase
B. Three-phase
C. Two-phase
D. Single-phase
Explanation:
37. A commutating rectifier consists of commutator driven by
A. an induction motor
B. a synchronous motor
C. a D.C. series motor
D. a D.C. shunt motor
Explanation:
38. In mercury arc rectifiers having grid, the arc can be struck between anode and cathode only when the grid attains a certain potential, this potential being known as
A. maximum grid voltage
B. critical grid voltage
C. any of the above
D. none of the above
Explanation:
39. A mercury arc rectifier possesses ________ regulation characteristics
A. straight line
B. curved line
C. exponential
D. none of the above
Explanation:
40. Selenium rectifier can be operated at temperatures as high as
A. 25�C
B. 40�C
C. 60�C
D. 75�C
Explanation:
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