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Industrial Drives - Interview Questions and Answers

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31. In which of the following applications variable speed operation is preferred ?
A. Exhaust fan
B. Ceiling fan
C. Refrigerator
D. Water pump
Explanation:
32. A pony motor is used for the starting which of the following motors ?
A. Squirel cage induction motor
B. Schrage motor
C. Synchronous motor
D. None of the above
Explanation:
33. For crane travel which of the following motors is normally used ?
A. Synchronous motor
B. D.C. differentially compound motor
C. Ward-Leonard controlled D.C. shunt motor
D. AC. slip ring motor
Explanation:
34. Reluctance motor is a
A. variable torque motor
B. low torque variable speed motor
C. self starting type synchronous motor
D. low noise, slow speed motor
Explanation:
35. The travelling speed of cranes varies from
A. 20 to 30 m/s
B. 10 to 15 m/s
C. 5 to 10 m/s
D. 1 to 2.5 m/s
Explanation:
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