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Transformers

Transformers
Efficiency of a power transformer is of the order of

50 per cent
98 per cent
25 per cent
100 per cent

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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
0.9 V
9 V
900 V

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Transformers
A common method of colling a power transformer is

Natural air cooling
Any of the listed here
Air blast cooling
Oil cooling

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Transformers
Sumpner's test is conducted on transformers to determine

all-day efficiency
stray losses
temperature
None of these

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

Thermal overload relays
Horn gaps
Breather
Conservator

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Transformers
Primary winding of a transformer

could either be a low voltage or high voltage winding
is always a low voltage winding
None of these
is always a high voltage winding

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