The thickness of laminations used in a transformer is usually____________?
The thickness of laminations used in a transformer is usually____________?
A. 0.4 mm to 0.5 mm
B. 4 mm to 5 mm
C. 14 mm to 15 mm
D. 25 mm to 40 mm
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In a transformer the resistance between its primary and secondary is____________?
In a transformer the resistance between its primary and secondary is____________?
A. zero
B. 1 ohm
C. 1000 ohms
D. infiniteA transformer oil must be free from________________?
A transformer oil must be free from________________?
A. sludge
B. odour
C. gases
D. moistureIron loss of a transformer can be measured by____________?
Iron loss of a transformer can be measured by____________?
A. low power factor wattmeter
B. unity power factor wattmeter
C. frequency meter
D. any type of wattmeterIf the percentage impedances of the two transformers working in parallel are different, then______________________?
If the percentage impedances of the two transformers working in parallel are different, then______________________?
A. transformers will be overheated
B. power factors of both the transformers will be same
C. parallel operation will be not possible
D. parallel operation will still be possible, but the power factors at which the two transformers operate will be different from the power factor of the common loadThe value of flux involved m the e.m.f. equation of a transformer is____________?
The value of flux involved m the e.m.f. equation of a transformer is____________?
A. average value
B. r.m.s. value
C. maximum value
D. instantaneous valueWhich of the following is the main advantage of an auto-transformer over a two winding transformer?
Which of the following is the main advantage of an auto-transformer over a two winding transformer?
A. Hysteresis losses are reduced
B. Saving in winding material
C. Copper losses are negligible
D. Eddy losses are totally eliminated