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Transformers

Transformers
The mutual inductance when k = 0.65, L1 = 2 H, and L2 = 5 H is

8 μH
2 mH
4 μH
2 μH

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Transformers
The mutual flux in a transformer remains constant at all loads because ______

Leakage flux is small
Applied voltage and frequency are constant
Iron core is used
Losses are small

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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

400 W
50 W
200 W
100 W

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Transformers
The primary coil of a transformer is connected to a 60 V ac source. The secondary coil is connected to a 330 load. The turns ratio is 3:1. What is the secondary voltage?

18 V
180 V
2 V
20 V

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Transformers
The effect of leakage flux in a transformer is to ______

Cause voltage drop in the windings
Decreases copper losses
None of the listed here
Increase copper losses

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Transformers
Which of the following transformer should never have the secondary open circuited while the primary is energised?

Current transformer
Potential transformer
Power transformer
Auto transformer

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