A. leading power factor
B. lagging power factor
C. unity power factor
D. zero power factor
Related Mcqs:
- A good voltage regulation of a transformer means________________?
A good voltage regulation of a transformer means
A. output voltage fluctuation from no load to full load is least
B. output voltage fluctuation with power factor is least
C. difference between primary and secondary voltage is least
D. difference between primary and secondary voltage is maximum - 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 factor - A transformer can have regulation closer to zero___________?
A. on full-load
B. on overload
C. on leading power factor
D. on zero power factor - Which of the following is the main advantage of an auto-transformer over a two winding transformer?
A. Hysteresis losses are reduced
B. Saving in winding material
C. Copper losses are negligible
D. Eddy losses are totally eliminated - The changes in volume of transformer cooling oil due to variation of atmospheric temperature during day and night is taken care of by which part of transformer?
A. Conservator
B. Breather
C. Bushings
D. Buchholz relay - Negative voltage regulation is indicative that the load is___________?
A. capacitive only
B. inductive only
C. inductive or resistive
D. none of the above - Minimum voltage regulation occurs when the power factor of the load is_____________?
A. unity
B. lagging
C. leading
D. zero - Which of the following loss in a transformer is zero even at full load ____________?
A. Core loss
B. Friction loss
C. Eddy current loss
D. Hysteresis loss - A transformer cannot raise or lower the voltage of a D.C. supply because_______________?
A. there is no need to change the D.C. voltage
B. a D.C. circuit has more losses
C. Faraday’s laws of electromagnetic induction are not valid since the rate of change of flux is zero
D. none of the above - The voltage transformation ratio of a transformer is equal to the ratio of_______________?
A. primary turns to secondary turns
B. secondary current to primary current
C. secondary induced e.m.f. to primary induced e.m.f
D. secondary terminal voltage to primary applied voltage
