Important Industrial Drive Multiple Choice Questions and Answers
41. 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. DC motor
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D. DC motor
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42. Which off the following motors is preferred when a smooth and resize speed control over a wide range is desired?
A. DC motor
B. Squirrel cage induction motor
C.Wound rotor induction motor
D. Synchronous motor
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43. Which of the following machines has heavy fluctuating of load ?
A. Printing machine
B. Punching machine
C. Planer
D. Lathe
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44. Which of the following motors is usually preferred for kiln drives?
A. Cascade controlled AC motor
B. Slip ring induction motor
C. Three phase shunt wound commutator motor
D. Any of the above
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45. 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. Start Delta starting
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