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Transformers

Transformers
The turns ratio required to match an 80 source to a 320 load is

80
2
20
4

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Transformers
The temperature rise of transformer is directly proportional to _______

Leakage reactance
Apparent power
Reactive power
None of the listed here

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Transformers
A transformer has 200 W as iron loss at full load. The iron loss at full load. The iron loss at half full load will be

50 W
400 W
200 W
100 W

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Transformers
For the parallel operation of single phase transformers it is necessary that they should have

same polarity
same efficiency
same number of turns on the secondary side.
same kVA rating

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Transformers
Material used for construction of transformer core is usually

Aluminium
Silicon steel
Wood
Copper

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Transformers
The secondary of a current transformer is always short-circuited under operating conditions because it

is safe to human beings
protects the primary circuit
None of these
avoids core saturation and high voltage induction

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