Electrical Engineering MCQs

Page No. 92

D.C. windings are____________?


asometimes 2-layer type

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bnever 2-layer type

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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

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bCross-over winding with either circular or small rectangular conductors

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cContinuous disc type winding with rectangular conductors

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dAll of the above types

✓



The flash point of transformer oil should be higher than_______________?


a40°C

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b60°C

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c 80°C

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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

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b 0.8 to 1.0 Wb/m2

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c1.1 to 1.35 Wb/m2

✓


d 1.4 to 1.8 Wb/m2

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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

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b1.5 to 2.0 A/mm2

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c2.2 to 3.2 A/mm2

✓


d 3.2 to 4.2 A/mm2

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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

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b2 + 0.5 kVmm

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c4 + 0.7 kV mm

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d5 + 0.9 kV mm

✓


View Answer 5 + 0.9 kV mm

The surge phenomenon is particularly important in case of_______________?


alow voltage transformers

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bmedium voltage transformers

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chigh voltage transformers

✓


dany of the above

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


aminor insulation

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bmajor insulation

✓


ceither of the above

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dnone of the above

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View Answer major insulation

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


aRadial

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b Trailing

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cReaction

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dAll of the above

✓


View Answer All of the above

___________ brushes are fragile and cause excessive wear of commutator?


aNatural graphite

✓


b Hard carbon

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cElectro graphitic

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d Metal graphite

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View Answer Natural graphite

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