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Transformers

Transformers
How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?

90 V
900 V
9 V
0.9 V

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Transformers
A common method of cooling a power transformer is

oil cooling
natural air cooling
air blast cooling
Any of these

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Transformers
Material used for construction of transformer core is usually

Wood
Aluminium
Silicon steel
Copper

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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
A transformer transfers electrical energy from primary to secondary usually with a change in ______

Power
Time period
Voltage
Frequency

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Transformers
The maximum flux produced in the core of a transformer is ______

None of the listed here
Inversely proportional to supply frequency
Inversely proportional to primary voltage
Directly proportional to supply frequency

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