TRANSFORMER - Practice Mode

1) Which is determined by the crackle test of transformer oil?

Acidity Moisture Viscosity Dielectric strength

Correct Answer: Moisture

2) Which material is used to make core of power transformer?

Soft iron Rolled steel Copper alloy Cold rolled grain oriented

Correct Answer: Cold rolled grain oriented

3) What is the purpose of providing explosion vent in a power transformer?

Air releasing Heat releasing Pressure releasing Moisture releasing

Correct Answer: Pressure releasing

4) What is the function of buchholz relay in power transformer?

Protection from high temperature Protection from moisture entering in oil Protection from pressure loading in tank Protection from both overloading and short circuit

Correct Answer: Protection from both overloading and short circuit

5) Why primary of potential transformer is wound with thin wire and large number of turns?

To offer high inductance To obtain required voltage ratio To regulate the primary current To stabilise input and output voltage

Correct Answer: To offer high inductance

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