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Industrial Drives - Interview Questions and Answers

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36. By the use of which of the followingm D.C. can be obtained from AC. ?
A. Silicon diodes
B. Mercury arc rectifier
C. Motor generator set
D. Any of the above
Explanation:
37. In which of the following applications the load on motor changes in cyclic order ?
A. Electric shovels
B. Cranes
C. Rolling mills
D. All of the above
Explanation:
38. Which of the following motors is preferred when quick speed reversal is the main consideration ?
A. Squirrel cage induction motor
B. Wound rotor induction motor
C. Synchronous motor
D. D.C. motor
Explanation:
39. In case of _______ speed control by injecting e.m.f. in the rotor circuit is possible,
A. d.c. shunt motor
B. schrage motor
C. synchronous motor
D. slip ring induction motor
Explanation:
40. For derries and winches which of the following drives can be used ?
A. Pole changing squirrel cage motors
B. D.C. motors with Ward-leonard con-trol
C. A.C. slip ring motors with variable resistance
D. Any of the above
Explanation:
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