In a transformer the resistance between its primary and secondary should be_____________?

The efficiency of a transformer, under heavy loads, is comparatively low because_______________?

A. copper loss becomes high in proportion to the output
B. iron loss is increased considerably
C. voltage drop both in primary and secondary becomes large
D. secondary output is much less as compared to primary input

The main reason for generation of harmonics in a transformer could be_______________?

A. fluctuating load
B. poor insulation
C. mechanical vibrations
D. saturation of core

The secondary of a current transformer is always short-circuited under operating conditions because it____________________?

A. avoids core saturation and high voltage induction
B. is safe to human beings
C. protects the primary circuit
D. none of the above

The use of higher flux density in the transformer design____________?

A. reduces weight per kVA
B. reduces iron losses
C. reduces copper losses
D. increases part load efficiency

A no-load test is performed on a transformer to determine_______________?

A. core loss
B. copper loss
C. efficiency
D. magnetising current
E. magnetising current and loss

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