49) Which type of transformer does not isolate the secondary ?

Potential transformer

Auto transformer

Distribution transformer

Current transformer

Answer is:

Auto transformer

Explanation:

The auto transformer with common winding can not be used as isolation transformer because it has a connection between primary and secondary side. Isolation transformer provides available supplying even if the device is broken.

Transformers MCQ - Electrician (Set-1) with Answers

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Related Transformers MCQ - Electrician (Set-1) with Answers

50) Voltage stabilizers are having auto transformer with tappings or stepless variation depending upon the type of stabilizer. Auto transformer in servo stabilizer is of :

core type

shell type

toroidal type

distributed core type

Answer is:

toroidal type

51) Single turn primary of a current transformer has a turns ratio 10:1. Which one of the following is the primary current if the current measured in secondary is 2 amperes ?

1 ampere

5 ampere

10 ampere

20 ampere

Answer is:

20 ampere

52) As compared to the secondary of a step up transformer, the primary will have :

lower voltage and higher current

higher voltage and higher current

higher voltage and lower current

lower voltage and higher current

Answer is:

lower voltage and higher current

53) In a transformer, if the number of turns in the secondary winding is twice that in the primary winding, the secondary voltage will be :

half that of primary voltage

same as the primary voltage

twice the primary voltage

four times the primary voltage

Answer is:

twice the primary voltage

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