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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?

9 V
90 V
0.9 V
900 V

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

Buchholz relay
Overcurrent protection
Overfluxing protection
All of these

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Transformers
A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is

5
25
0.2
0.4

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Transformers
A common method of cooling a power transformer is

natural air cooling
Any of these
oil cooling
air blast cooling

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Transformers
Which of the following property is not necessarily desirable in the material for transformer core?

High permeability
Mechanical strength
Low hysteresis loss
High thermal conductivity

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Transformers
If 25 W of power are applied to the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is

250 W
2.5 W
25 W
0 W

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