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Transformers

Transformers
When a 6 V battery is connected across the primary of a transformer with a turns ratio of 8, the secondary voltage is

48 V
0 V
6 V
0.75 V

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Transformers
Leakage flux in a transformer occurs because

Applied voltage is sinusoidal
Air is not a good magnetic insulator
Iron core has high permeability
Transformer is not an efficient device

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Transformers
An open-circuit test on a transformer is conducted primarily to measure

insulation resistance
core loss
total loss
copper loss

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Transformers
In a certain transformer, the input power to the primary is 120 W. If 8.5 W are lost to the winding resistance, what is the output power to the load, neglecting any other issues?

1,020 W
111.5 W
0 W
14.1 W

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Transformers
The flux in the core of a single phase transformer is _____

Purely alternating one
Partly alternating and partly rotating
None of the listed here
Purely rotating one

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Transformers
Which of the following is not a fitting on a transformer?

Commutator
Conservator
Buchholz's relay
Breather

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