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Transformers

Transformers
When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is

12 V
240 V
120 V
2,400 V

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Transformers
In which of the following transformer part of primary winding also serves as the secondary winding?

Potential transformer
Auto transformer
Current transformer
Step-up transformer

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Transformers
A common method of cooling a power transformer is

air blast cooling
Any of these
oil cooling
natural air cooling

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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?

880 V
7.3 V
88 V
73 V

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Transformers
Which of the following is not a part of transformer installation?

Exciter
Buchholz relay
Breather
Conservator

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Transformers
Open circuit test on transformers is conducted to determine

core losses
hysteresis losses
copper losses
eddy current losses

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MORE MCQ ON Transformers

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