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Transformer MCQ Online Test

Transformer: [ ISRO,DRDO,DMRC,SAIL, ODNANCE, HAL, WBSEDCL, RAILWAY
& Others competitive]

51. Power transformers are generally designed to have maximum efficiency around…

1.no-load

2.half-load

3.near full-load

4.10% overload

52. Which of the following is the main advantage of an auto-transformer over a two winding transformer?

1.Hysteresis losses are reduced

2.Saving in winding material

3.Copper losses are negligible

4.Eddy losses are totally eliminated

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53. During short-circuit test iron losses are negligible because….

1.the current on secondary side is negligible

2.the voltage on secondary side does not vary

3.  the voltage applied on primary side is low

4.full-load current is not supplied to the transformer

54. Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in.

1.short-circuiting of the secondary

2.power factor of one of the transformers is leading while that of the other lagging.

3.transformers having higher copper losses will have negligible core losses

4.   loading of the transformers not in proportion to their kVA ratings

55. The changes in volume of transformers cooling oil due to variation of atmospheric temperature during day and night is taken care of by which part of transformer?

1.  Conservator

2.Breather

3.Bushings

4.Buchholz relay

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56.The transformer laminations are insulated from each other by..

1.mica strip

2.thin coat of varnish

3.   paper

4.any of the above

57.Which type of winding is used in 3-phase shell-type transformer?

1.Circular type

2.Sandwich type

3.Cylindrical type

4.Rectangular type

58. During open circuit test of a transformer…

1.primary is supplied rated voltage

2.primary is supplied full-load current

3.primary is supplied current at reduced voltage

4primary is supplied rated kVA

 59.Open circuit test on transformers is conducted to determine…

1.hysteresis losses

2.copper losses

3.  core losses

4.eddy current losses

    www.electricaleducations.com

60. Short circuit test on transformers is conducted to determine…

1.hysteresis losses

2.  copper losses

3.core losses

4.eddy current losses

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