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Electrical Machine Design - Interview Questions and Answers

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51. A current density of _____ is ilsed for large power transformers with forced circulation of oil or with water cooling coils
A. 1.5 to 2.5 A/mm2
B. 3.5 to 4.5 A/mm2
C. 4.0 to 5.0 A/mm2
D. 5.4 to 6.2 A/mm2
Explanation:
52. The cylindrical windings using circular conductors are used for current rating of
A. upto 20 A
B. upto 40 A
C. upto 60 A
D. upto 80 A
Explanation:
53. The cold rolled grain oriented steel has ______ permeability in the direction of the grain orientation.
A. minimum
B. maximum
C. nil
D. none of the above
Explanation:
54. The voltage control in electric supply networks in required on account of which of the following reasons ?
A. Adjustment of voltage at consumers premises within statutory limits
B. Control of active and reactive power
C. Adjustment of short period daily and seasonal voltage variations in accordance with variations of load
D. All of the above
Explanation:
55. The surge phenomenon is particularly important in case of
A. low voltage transformers
B. medium voltage transformers
C. high voltage transformers
D. any of the above
Explanation:
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