71) What may be the cause for over heating of a transformer ?

High ambient temperature

Input voltage is too low

Load is too high

Arc from the transformer primary to the secondary

Answer is:

Load is too high

Transformers MCQ - Electrician (Set-1) with Answers

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Related Transformers MCQ - Electrician (Set-1) with Answers

72) In which part of the distribution transformer, maximum heat occurs ?

Transformer core

Transformer tank

Transformer oil

L.V. and H.V. winding

Answer is:

L.V. and H.V. winding

Explanation:

Assuming that the transformer is working at its rated capacity, the maximum heating occurs in the winding. The transformer core is made using low loss materials to make it more efficient and thus the core loss at rated load is a fraction of the winding loss.