Electrical Machine Design Objective type Questions and Answers pdf

61.    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
Ans: b

62.    Cylindrical windings using circular conductors, employed in transformers, are
(a)     single layered
(b)     double layered
(c)    multi-layered
(d)    none of the above
Ans: c

63.    Helical windings are used in
(a)    distribution transformers
(b)    power transformers
(c)    shell type transformers
(d)    none of the above
Ans: b

64.    Multi-layer helical windings are commonly used in the transformers as high voltage windings
(a)     upto 20 kV
(b)     upto 50 kV
(c)    upto 80 kV
(d)    for 110 kV and above
Ans: d

65.    Disc windings are primarily used in
(a)    short capacity transformers
(b)    medium capacity transformers
(c)    high capacity transformers
(d)    any of the above
Ans: c

66.    The heat dissipating capability of transformers of ratings higher than 30 kVA in increased by providing which of the following ?
(a)     Corrugations
(b)     Fins
(c)     Tubes
(d)     Radiator tanks
(e)    All of the above
Ans: e

67.    Transformers with a capacity of upto _____ have a cooling radiator system with natural cooling
(a)     2 MVA
(b)     5 MVA
(c)     7.5 MVA
(d)     10 MVA
Ans: d

68.    The forced oil and air circulation method is usual one for transformers of capacities
(a)     upto 5 MVA
(b)     upto 10 MVA
(c)    upto 20 MVA
(d)    30 MVA upwards
Ans: d

69.    The flash point of transformer oil should be higher than
(a)   40°C
(b)   60°C
(c)   80°C
(d)   104°C
Ans: d

70.    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
Ans: d

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