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Industrial Drives - Interview Questions and Answers

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21. Which ofthefollowing motors is preferred when smooth and precise speed control over a wide range is desired ?
A. D.C. motor
B. Squirrel cage induction motor
C. Wound rotor induction motor
D. Synchronous motor
Explanation:
22. Which of the following machines has heavy fluctuation of load ?
A. Printing machine
B. Punching machine
C. Planer
D. Lathe
Explanation:
23. When the load is above _____ a synchronous motor is found to be more economical.
A. 2 kW
B. 20 kW
C. 50 kW
D. 100 kW
Explanation:
24. Battery operated scooter for braking uses
A. plugging
B. mechanical braking
C. regenerative braking
D. rheostatic braking
Explanation:
25. In jaw crushers a motor has to often start against ______ load.
A. heavy
B. medium
C. normal
D. low
Explanation:
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