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Transformers

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

4 μH
2 mH
8 μH
2 μH

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Transformers
When secondary of a current transformer is open-circuited its iron core will be

cool as there is no secondary current
none of above will happen
hot because primary will carry heavy current
hot because of heavy iron losses taking place in it due to high flux density

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Transformers
The temperature rise of transformer is directly proportional to _______

Apparent power
Leakage reactance
None of the listed here
Reactive power

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Transformers
An ideal transformer is one which _______

Has no losses and leakage reactance
Has same number of primary and secondary turns
Does not work
None of the listed here

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Transformers
The permissible flux density in case of cold rolled grain oriented steel is around

3.7 Wb/m²
2.7 Wb/m²
4.7 Wb/m²
1.7 Wb/m²

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Transformers
Short circuit test on transformers is conducted to determine

hysteresis losses
eddy current losses
core losses
copper losses

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