Short 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
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The no load current in a transformer lags behind the applied voltage by an angle of about_____________?
The no load current in a transformer lags behind the applied voltage by an angle of about_____________?A. 180°
B. 120″
C. 90°
D. 75°Primary winding of a transformer________________?
Primary winding of a transformer________________?
A. is always a low voltage winding
B. is always a high voltage winding
C. could either be a low voltage or high voltage winding
D. none of the aboveWhich of the following property is not necessarily desirable in the material for transformer core ?
Which of the following property is not necessarily desirable in the material for transformer core ?
A. Mechanical strength
B. Low hysteresis loss
C. High thermal conductivity
D. High permeabilityDuring short circuit test iron losses are negligible because of _____________?
During short circuit test iron losses are negligible because of _____________?
A. the current on secondary side is negligible
B. the voltage on secondary side does not vary
C. the voltage applied on primary side is low
D. full-load current is not supplied to the transformerOpen 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 efficiency of a transformer will be maximum when_____________?
The efficiency of a transformer will be maximum when_____________?
A. copper losses = hysteresis losses
B. hysteresis losses = eddy current losses
C. eddy current losses = copper losses
D. copper losses = iron losses