Electrical Engineering MCQs

Page No. 91

Multi-layer helical windings are commonly used in the transformers as high voltage windings_______________?


aupto 20 kV

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b upto 50 kV

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cupto 80 kV

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dfor 110 kV and above

✓


View Answer for 110 kV and above

Helical windings are used in________________?


a. distribution transformers

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bpower transformers

✓


cshell type transformers

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d none of the above

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View Answer power transformers

Disc windings are primarily used in_____________-?


ashort capacity transformers

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bmedium capacity transformers

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chigh capacity transformers

✓


dany of the above

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The forced oil and air circulation method is usual one for transformers of capacities____________?


aupto 5 MVA

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bupto 10 MVA

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cupto 20 MVA

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d30 MVA upwards

✓


View Answer 30 MVA upwards

The heat dissipating capability of transformers of ratings higher than 30 kVA in increased by providing which of the following ?


a Corrugations

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b Fins

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c Radiator tanks

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d All of the above

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View Answer All of the above

Transformers with a capacity of up to __________ have a cooling radiator system with natural cooling?


a2 MVA

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b5 MVA

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c7.5 MVA

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d10 MVA

✓


View Answer 10 MVA

The voltage control in electric supply networks in required on account of which of the following reasons ?


aAdjustment of voltage at consumers premises within statutory limits

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bControl of active and reactive power

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cAdjustment of short period daily and seasonal voltage variations in accordance with variations of load

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dAll of the above

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View Answer All of the above

Which of the following is the basic consideration in the design of insulation ?


aElectrical considerations

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bMechanical considerations

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cThermal considerations

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dAll of the above

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View Answer All of the above

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

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b3.5 to 4.5 A/mm2

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c 4.0 to 5.0 A/mm2

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d5.4 to 6.2 A/mm2

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View Answer 5.4 to 6.2 A/mm2

For 275 kV transformers, using cold rolled grain oriented steel, which of the following values of flux density may be used?


a1.0 Wb/m2

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b1.1 Wb/m2

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c1.3 Wb/m2

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d 1.6 Wb/m2

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View Answer 1.6 Wb/m2

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