Electrical Engineering MCQs

Page No. 92

D.C. windings are____________?


asometimes 2-layer type


bnever 2-layer type


calways 2-layer type


d none of the above


View Answer always 2-layer type

The high voltage winding is usually which of the following type ?


aCylindrical winding with circular conductors


bCross-over winding with either circular or small rectangular conductors


cContinuous disc type winding with rectangular conductors


dAll of the above types



The flash point of transformer oil should be higher than_______________?


a40°C


b60°C


c 80°C


d 104°C


View Answer 104°C

The usual values of maximum flux densities for distribution transformers using hot rolled silicon steel are______________?


a0.5 to 0.8 Wb/m2


b 0.8 to 1.0 Wb/m2


c1.1 to 1.35 Wb/m2


d 1.4 to 1.8 Wb/m2


View Answer 1.1 to 1.35 Wb/m2

For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used?


a1.0 to 1.2 A/mm2


b1.5 to 2.0 A/mm2


c2.2 to 3.2 A/mm2


d 3.2 to 4.2 A/mm2


View Answer 2.2 to 3.2 A/mm2

A practical formula for determining the thickness of insulation between low voltage and high voltage windings is__________________?


a1 + 0.2 kVmm


b2 + 0.5 kVmm


c4 + 0.7 kV mm


d5 + 0.9 kV mm


View Answer 5 + 0.9 kV mm

The surge phenomenon is particularly important in case of_______________?


alow voltage transformers


bmedium voltage transformers


chigh voltage transformers


dany of the above



The insulation between windings and grounded core and the insulation between the windings of the same phase is called__________________?


aminor insulation


bmajor insulation


ceither of the above


dnone of the above


View Answer major insulation

____________ is the common method of applying brushes to the commntator?


aRadial


b Trailing


cReaction


dAll of the above


View Answer All of the above

___________ brushes are fragile and cause excessive wear of commutator?


aNatural graphite


b Hard carbon


cElectro graphitic


d Metal graphite


View Answer Natural graphite

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