Which of the following does not change in an ordinary transformer ?
Which of the following does not change in an ordinary transformer ?
A. Frequency
B. Voltage
C. Current
D. Any of the above
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The core used in high frequency transformer is usually___________?
The core used in high frequency transformer is usually___________?
A. copper core
B. cost iron core
C. air core
D. mild steel coreThe 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 transformerIn a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are__________?
In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are__________?
A. hysteresis and eddy current losses
B. friction and windage losses
C. copper losses
D. none of the aboveThe 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 valueThe use of higher flux density in the transformer design____________?
The use of higher flux density in the transformer design____________?
A. reduces weight per kVA
B. reduces iron losses
C. reduces copper losses
D. increases part load efficiencyA transformer can have zero voltage regulation at______________?
A transformer can have zero voltage regulation at______________?
A. leading power factor
B. lagging power factor
C. unity power factor
D. zero power factor