A shell-type transformer has_________?

An ideal transformer is one which has_____________?

A. no losses and magnetic leakage
B. interleaved primary and secondary windings
C. a common core for its primary and secondary windings
D. core of stainless steel and winding of pure copper metal
E. none of the above

If the supply frequency to the transformer is increased,”the iron loss will__________?

A. not change
B. decrease
C. increase
D. any of the above

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

If a transformer is switched on to a voltage more than the rated voltage______________?

A. its power factor will deteriorate
B. its power factor will increase
C. its power factor will remain unaffected
D. its power factor will be zero

The efficiency of two identical transformers under load conditions can be determined by_______________?

A. short-circuit test
B. back-to-back test
C. open circuit test
D. any of the above

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