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Industrial Drives - Interview Questions and Answers

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46. A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is
A. slop speed operation
B. high starting torque
C. low windage losses
D. all of the above
Explanation:
47. For which of the following applications motor has to start with high acceleration?
A. Oil expeller
B. Floor mill
C. Lifts and hoists
D. Centrifugal pump
Explanation:
48. For a D.C. shunt motor which of the following is incorrect 7
A. Unsuitable for heavy duty starting
B. Torque varies as armature current
C. Torque-armature current is a straight line
D. Torque is zero for zero armature current
Explanation:
49. The diameter of the rotor shaft for an electric motor depends on which of the following ?
A. r.p.m. only
B. Horse power only
C. Horse power and r.p.m.
D. Horse power, r.p.m. and power factor
Explanation:
50. Which of the following happens when star-delta starter is used ?
A. Starting voltage is reduced
B. Starting current is reduced
C. Both (a) and (b)
D. None of the above
Explanation:
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