Power Transformer MCQs

In transformer under the no load condition which loss negligible

Correct! Wrong!

Open circuit test on transformer is used to find

Correct! Wrong!

The phase difference between primary and secondary voltage of transformer is

Correct! Wrong!

Tapping on transformer is usually provided on

Correct! Wrong!

Transformer has maximum voltage regulation at

Correct! Wrong!

The efficiency of power transformer is around

Correct! Wrong!

Transformer core has

Correct! Wrong!

At no load current taken by the transformer lags behind the applied voltage by

Correct! Wrong!

When conducting short circuit test on transformer which side is short circuited

Correct! Wrong!

Short circuit test on transformer is used to find

Correct! Wrong!

It is advisable to use the auto transformer if the transformation ratio is

Correct! Wrong!

Two transformers operating in parallel will share the load depending upon their

Correct! Wrong!

Auto transformer is used in transmission and distribution when

Correct! Wrong!

A transformer transforms

Correct! Wrong!

Primary Winding of transformer

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A Common method for cooling a power transformer is

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A power transformer is a constant

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A transformer oil must free from

Correct! Wrong!

In transformer the resistance between primary and secondary winding is

Correct! Wrong!

Which of the following relay is used in transformer

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In transformer Buchholz relay give warning and protection against

Correct! Wrong!

Tapping on transformer is usually provided for the

Correct! Wrong!

In high frequency transformer which type of core is used

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Buchholz relay is generally not provided on transformers below

Correct! Wrong!

The are rating of transformer is always expressed in

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Which of the following does not change in a transformer

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In a transformer the energy is conveyed from primary to secondary

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A transformer core is laminated to

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The degree of mechanical vibrations produced by the laminations of a transformer depends on

Correct! Wrong!

The no-load current drawn by transformer is usually what per cent of the full-load current

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The path of a magnetic flux in a transformer should have

Correct! Wrong!

No-load on a transformer is carried out to determine

Correct! Wrong!

The dielectric strength of transformer oil is expected to be

Correct! Wrong!

Sumper's test is conducted on trans-formers to determine

Correct! Wrong!

The permissible flux density in case of cold rolled grain oriented steel is around

Correct! Wrong!

The efficiency of a transformer will be maximum when

Correct! Wrong!

No-load current in a transformer

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The purpose of providing an iron core in a transformer is to

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Which of the following is not a part of transformer installation

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While conducting short-circuit test on a transformer the following side is short circuited

Correct! Wrong!

5 thoughts on “Power Transformer MCQs

  1. Imtiaz Khattak Reply

    Dear i think transformer transform power & common method of cooling is oil cooling .

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