The chemical used in breather is_______________?

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

In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are__________?

A. hysteresis and eddy current losses
B. friction and windage losses
C. copper losses
D. none of the above

Transformer breaths in when_______________?

A. load on it increases
B. load on it decreases
C. load remains constant
D. none of the above

The thickness of laminations used in a transformer is usually____________?

A. 0.4 mm to 0.5 mm
B. 4 mm to 5 mm
C. 14 mm to 15 mm
D. 25 mm to 40 mm

Which of the following properties is not necessarily desirable for the material for transformer core ?

A. Low hysteresis loss
B. High permeability
C. High thermal conductivity
D. Adequate mechanical strength

In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of_________________?

A. less than 15 A
B. more than 15 A
C. 15 A
D. none of the above