TRANSFORMER - Practice Mode

1) Which material is used in breather to prevent moisture entering in the transformer oil?

Silica gel Sodium chloride Ammonium chloride Charcoal and salt mixture

Correct Answer: Silica gel

2) What is the disadvantage of auto transformer?

More losses Heavier in weight Poor voltage regulation Cannot isolate the secondary winding

Correct Answer: Cannot isolate the secondary winding

3) Which cooling method is used in pole mounting distribution transformer?

Air natural Oil natural air blast Oil forced air forced Oil natural air natural

Correct Answer: Oil natural air natural

4) What is the composition of steel and silicon steel in transformer core?

Steel 97% and silicon 3% Steel 95% and silicon 5% Steel 93% and silicon 7% Steel 90% and silicon 10%

Correct Answer: Steel 93% and silicon 7%

5) What is the purpose of tap changing in power transformers?

Maintain primary voltage constant Change voltage ratio in distribution Maintain secondary voltage constant Load the transformer for maximum efficiency

Correct Answer: Change voltage ratio in distribution

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