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Transformers

Transformers
The no load primary current is about ______of full load primary current.

Above 40%
15-30%
30-40%
3-5%

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Transformers
A tap changer is used on a transformer for

Adjustment in both primary and secondary
None of the listed here
Adjustments in secondary voltage
Adjustment in primary voltage

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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?

0.9 V
9 V
90 V
900 V

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Transformers
The leakage flux in a transformer depends upon

load current
load current and voltage
load current, voltage, frequency and power factor
load current, voltage and frequency

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Transformers
Which of the following protection is normally not provided on small distribution transformers?

Buchholz relay
Overfluxing protection
Overcurrent protection
All of these

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Transformers
Primary winding of a transformer

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

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