In a transformer routine efficiency depends upon_____________?
In a transformer routine efficiency depends upon_____________?
A. supply frequency
B. load current
C. power factor of load
D. both B. and (c)
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The noise resulting from vibrations of laminations set by magnetic forces, is termed as_________________?
The noise resulting from vibrations of laminations set by magnetic forces, is termed as_________________?
A. magnetostrication
B. boo
C. hum
D. zoomFor given applied voltage, with the increase in frequency of the applied voltage?
For given applied voltage, with the increase in frequency of the applied voltage?
A. eddy current loss will decrease
B. eddy current loss will increase
C. eddy current loss will remain unchanged
D. none of the aboveOpen circuit test on transformers is conducted to determine____________?
Open circuit test on transformers is conducted to determine____________?
A. hysteresis losses
B. copper losses
C. core losses
D. eddy current lossesThe 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 lossesWhich of the following does not change in a transformer ?
Which of the following does not change in a transformer ?
A. Current
B. Voltage
C. Frequency
D. All of the aboveShort circuit test on transformers is conducted to determine____________?
Short circuit test on transformers is conducted to determine____________?
A. hysteresis losses
B. copper losses
C. core losses
D. eddy current losses