Electrical Engineering MCQs

Page No. 91

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


aupto 20 kV


b upto 50 kV


cupto 80 kV


dfor 110 kV and above


View Answer for 110 kV and above

Helical windings are used in________________?


a. distribution transformers


bpower transformers


cshell type transformers


d none of the above


View Answer power transformers

Disc windings are primarily used in_____________-?


ashort capacity transformers


bmedium capacity transformers


chigh capacity transformers


dany of the above



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


aupto 5 MVA


bupto 10 MVA


cupto 20 MVA


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


b Fins


c Radiator tanks


d All of the above


View Answer All of the above

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


a2 MVA


b5 MVA


c7.5 MVA


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


bControl of active and reactive power


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


dAll of the above


View Answer All of the above

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


aElectrical considerations


bMechanical considerations


cThermal considerations


dAll of the above


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


b3.5 to 4.5 A/mm2


c 4.0 to 5.0 A/mm2


d5.4 to 6.2 A/mm2


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


b1.1 Wb/m2


c1.3 Wb/m2


d 1.6 Wb/m2


View Answer 1.6 Wb/m2

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