TRANSFORMERS QUIZ

Sumpner's test is conducted on transformer to determine

Stray losses

None of the listed here

Temperature

All day efficiency

TRUE ANSWER : ?
YOUR ANSWER : ?

A transformer oil must be free from

Odour

Sludge

Gases

Moisture

TRUE ANSWER : ?
YOUR ANSWER : ?

Efficiency of a power transformer is of the order of

25 per cent

100 per cent

50 per cent

98 per cent

TRUE ANSWER : ?
YOUR ANSWER : ?

Open circuit test on transformers is conducted to determine

core losses

eddy current losses

hysteresis losses

copper losses

TRUE ANSWER : ?
YOUR ANSWER : ?

A shell-type transformer has

None of these

negligibly hysteresis losses

high eddy current losses

reduced magnetic leakage

TRUE ANSWER : ?
YOUR ANSWER : ?

The noise produced by a transformer is termed as

buzz

zoom

ringing

hum

TRUE ANSWER : ?
YOUR ANSWER : ?

When load on a transformer is decreased, ______loss is decreased

Hysteresis

Friction

Copper

Eddy current

TRUE ANSWER : ?
YOUR ANSWER : ?

The eddy current loss in a transformer is directly proportional to _______.

Thickness of core lamination

The supply frequency

Square of thickness of core lamination

The flux density in the core

TRUE ANSWER : ?
YOUR ANSWER : ?

The output current corresponding to the maximum efficiency for a transformer having core loss of 200 W and equivalent resistance referred to secondary of 0.5 Ω is

5 A

10 A

15 A

20 A

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not a fitting on a transformer?

Conservator

Breather

Buchholz's relay

Commutator

TRUE ANSWER : ?
YOUR ANSWER : ?

↑