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Transformers

Transformers
Natural oil cooling is used for transformers upto a rating of

3000 kVA
500 kVA
250 kVA
1000 kVA

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Transformers
A transformer with a 110 V primary has a 15:1 turns ratio. The load resistance, RL, is 120 . What is the approximate voltage across the load?

88 V
880 V
73 V
7.3 V

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Transformers
The dielectric strength of transformer oil is expected to be

lkV
100 kV
33 kV
330 kV

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Transformers
The voltage transformation ratio of a transformer is equal to the ratio of

secondary induced e.m.f. to primary induced e.m.f.
secondary current to primary current
secondary terminal voltage to primary applied voltage
primary turns to secondary turns

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Transformers
A transformer is an efficient device because

A static device
Uses capacitive coupling
Uses inductive coupling
Uses electric coupling

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Transformers
Natural air cooling is generally restricted for transformers up to

1.5 MVA
5 MVA
15 MVA
50 MVA

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MORE MCQ ON Transformers

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