ANIMAL CELL CULTURE AND REGULATION QUIZ

The all day efficiency of a transformer is ______ the commercial efficiency.

The same as

More than

Less than

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

A transformer oil must be free from

Odour

Sludge

Moisture

Gases

TRUE ANSWER : ?
YOUR ANSWER : ?

Transformer having ratings less than 5kVA are generally ______

Oil cooled

None of the listed here

Natural air cooled

Water cooled

TRUE ANSWER : ?
YOUR ANSWER : ?

The mutual flux in a transformer remains constant at all loads because ______

Leakage flux is small

Iron core is used

Applied voltage and frequency are constant

Losses are small

TRUE ANSWER : ?
YOUR ANSWER : ?

Open circuit test on transformers is conducted to determine

hysteresis losses

eddy current losses

core losses

copper losses

TRUE ANSWER : ?
YOUR ANSWER : ?

An ideal transformer is one which has

interleaved primary and secondary windings

a common core for its primary and secondary windings

core of stainless steel and winding of pure copper metal

no losses and magnetic leakage

TRUE ANSWER : ?
YOUR ANSWER : ?

What is the approximate efficiency of large transformers?

95 %

85%

75%

65%

TRUE ANSWER : ?
YOUR ANSWER : ?

Burden of a current transformer is usually expressed in

Amperes

Kilowatt

Volts

Volt amperes

TRUE ANSWER : ?
YOUR ANSWER : ?

In the short circuit test on a transformer, we generally short circuit ______

Either low or high voltage winding

Low voltage winding

High voltage winding

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?

900 V

0.9 V

90 V

9 V

TRUE ANSWER : ?
YOUR ANSWER : ?

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