The 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 value
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The secondary winding of which of the following transformers is always kept closed?
The secondary winding of which of the following transformers is always kept closed?
A. Step-up transformer
B. Step-down transformer
C. Potential transformer
D. Current transformerNo-load current of a transformer has_____________?
No-load current of a transformer has_____________?
A. has high magnitude and low power factor
B. has high magnitude and high power factor
C. has small magnitude and high power factor
D. has small magnitude and low power factorWhich of the following is not a routine test on transformers ?
Which of the following is not a routine test on transformers ?
A. Core insulation voltage test
B. Impedance test
C. Radio interference test
D. Polarity testFor a transformer, operating at constant load current, maximum efficiency will occur at______________?
For a transformer, operating at constant load current, maximum efficiency will occur at______________?
A. 0.8 leading power factor
B. 0.8 lagging power factor
C. zero power factor
D. unity power factorThe purpose of providing an iron core in a transformer is to_____________?
The purpose of providing an iron core in a transformer is to_____________?
A. provide support to windings
B. reduce hysteresis loss
C. decrease the reluctance of the magnetic path
D. reduce eddy current lossesThe magnetising current of a transformer is usually small because it has___________?
The magnetising current of a transformer is usually small because it has___________?
A. small air gap
B. large leakage flux
C. laminated silicon steel core
D. fewer rotating parts