Important Industrial Drive Multiple Choice Questions and Answers
21. For derries and winches which of the following drives can be used ?
A. Pole changing squirrel cage motors
B. DC motors with word Leonard control
C. AC slip rings motors with a variable resistance
D. Any of the above
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D. Any of the above
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22. In........ method of starting three phase induction motors the starting voltage is not reduced
A. Auto transformer
B. Star Delta
C. Slip ring
D. Any of the above
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23. For which off the following applications DC motors are still preferred?
A. High operation
B. Variable speed drive
C. High starting torque
D. Reversibility
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24. Rotor of the motor is usually supported on........... bearings
A. Ball or roller
B. Needle
C. Thrust
D. Bush
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25. .............method of starting a three phase induction motor needs six terminals
A. Resistance starting
B. Auto transformer
C. None of the above
D. Star delta
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