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Industrial Drives - Interview Questions and Answers

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41. In series motor which of the following methods can be used for changing the flux per pole ?
A. Tapped field control
B. Diverter field control
C. Series-parallel control
D. Any of the above
Explanation:
42. The cost of an induction motor will increase as
A. horsepower rating increases but r.p.m. decreases
B. horsepower rating decreases but r.p.m. increases
C. horsepower rating and operating speed increases
D. horsepower rating and operating speed decreases
Explanation:
43. Which of the following alternatives will be cheaper ?
A. A 100 H.P. AC. three phase motor
B. Four motors of 25 H.P. each
C. Five motors of 20 H.P. each
D. Ten motors of 10 H.P. each
Explanation:
44. Which of the following motors is preferred for boom hoist of a travelling crane ?
A. Single phase motor
B. Synchronous motor
C. A.C. slip ring motor
D. Ward-Leonard controlled D.C. shunt motor
Explanation:
45. In a paper mill where constant speed is required
A. synchronous motors are preferred
B. A.C. motors are preferred
C. individual drive is preferred
D. group drive is preferred
Explanation:
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