Top 80+ Solved Transformers MCQ Questions Answer
Q. Part of the transformer which is most subject to damage from overheating is
a. iron core
b. copper winding
c. winding insulation
d. frame or case
Q. 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
Q. Auto-transformer makes effective saving on copper and copper losses, when itstransformation ratio is
a. approximately equal to one
b. less than one
c. great than one
d. none of the above
Q. Minimum voltage regulation occurs when the power factor of the load is
a. unity
b. lagging
c. leading
d. zero
Q. In a step-down transformer, there is a change of 15 A in the load current. This resultsin change of supply current of
a. less than 15 A
b. more than 15 A
c. 15 A
d. none of the above
Q. The efficiencies of transformers compared with that of electric motors of the samepower are
a. about the same
b. much smaller
c. much higher
d. somewhat smaller