rectifiers and converters Mcqs
51. The ignited or auxiliary anode in mercury arc rectifier is made of____________?
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A. aluminium

B. copper

C. graphite

D. boron carbide
52. Which of the following mercury arc rectifier will deliver least undulating current?
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A. Three-phase

B. Two-phase

C. Six-phase

D. Single-phase

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

54. In selenium rectifiers efficiencies ranging from _______ to _______ percent are attainable?
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A. 25, 35

B. 40, 50

C. 60, 70

D. 75, 85
55. The voltage drop between the anode and cathode, of a mercury arc rectifier comprises of the following_____________?
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A. anode drop, cathode drop and arc drop

B. anode drop and cathode drop

C. anode drop and arc drop

D. cathode drop and arc drop

56. Copper oxide rectifier is usually designed not to operate above___________?
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A. 20C

B. 30C

C. 10C

D. 45C
57. Which of the following metals is generally manufactured by electrolysis process ?
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A. Copper

B. Zinc

C. Aluminium

D. None of the above

E. Load

58. In a phase-shift control method, the phase shift between anode and grid voltages can be achieved by means of______________?
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A. synchronous generator

B. induction regulator

C. synchronous motor

D. shunt motor