Category: Transformers

A. temperature
B. stray losses
C. all-day efficiency
D. none of the above

A. capacitive only
B. inductive only
C. inductive or resistive
D. none of the above

A. magnetostrication
B. boo
C. hum
D. zoom

A. iron core
B. copper winding
C. winding insulation
D. frame or case
E. transformer tank

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

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

A. Frequency
B. Voltage
C. Current
D. Any of the above

A. insulation resistance
B. copper loss
C. core loss
D. total loss
E. efficiency
F. none of the above

A. transformers will be overheated
B. power factors of both the transformers will be same
C. parallel operation will be not possible
D. parallel operation will still be possible, but the power factors at which the two transformers operate will be different from the power factor of the common load

A. The power factor of the two trans-formers will be different from the power factor of common load
B. Incorrect polarity will result in dead short circuit
C. The transformers will not share load in proportion to their kVA ratings
D. none of the above