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Industrial Drives - Interview Questions and Answers

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16. Ward-Leonard controlled D.C. drives are generally used for ______ excavators.
A. Light duty
B. Medium duty
C. Heavy duty
D. All of the above
Explanation:
17. Besides a constant speed a synchronous rotor possesses which of the following advantages ?
A. Lower cost
B. Better efficiency
C. High power factor
D. All of the above
Explanation:
18. Heat control switches are used in
A. transformers
B. cooling ranges
C. three phase induction motors
D. single phase
Explanation:
19. The capacity of a crane is expressed in terms of
A. type of drive
B. span
C. tonnes
D. any of the above
Explanation:
20. In squirrel cage induction motors which of the following methods of starting cannot be used ?
A. Resistance in rotor circuit
B. Resistance in stator circuit
C. Auto-transformer starting
D. Star-delta starting
Explanation:
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