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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No-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 factorNo-load on a transformer is carried out to determine______________?
No-load on a transformer is carried out to determine______________?
A. copper loss
B. magnetising current
C. magnetising current and loss
D. efficiency of the transformerHarmonics in transformer result in___________?
Harmonics in transformer result in___________?
A. increased core losses
B. increased I2R losses
C. magnetic interference with communication circuits
D. all of the aboveIn a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of_________________?
In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of_________________?
A. less than 15 A
B. more than 15 A
C. 15 A
D. none of the aboveIron 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 wattmeterIn 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 above