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Transformers

Transformers
Natural air cooling is generally restricted for transformers up to

15 MVA
1.5 MVA
50 MVA
5 MVA

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Transformers
Which of the following acts as a protection against high voltage surges due to lightning and switching?

Horn gaps
Thermal overload relays
Conservator
Breather

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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
14.1 W
0 W

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

core loss
total loss
insulation resistance
copper loss

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Transformers
How are transformers generally cooled for installations rated at less than 5kVA ?

Water cooled
Oil cooled
None of the listed here
Air cooled

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Transformers
The output current corresponding to the maximum efficiency for a transformer having core loss of 200 W and equivalent resistance referred to secondary of 0.5 Ω is

20 A
10 A
5 A
15 A

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