electrical engg 2

The Function of a Conservator in a Transformer is ??

• To project against internal fault.

• To reduce core loss and copper loss

• To take care of the expansion and contraction of transformer oil due to the variation of temperature of surroundings.

• To cool the transformer oil.

Buchholz's relay gives warning and protection against

• Electrical fault inside the transformer itself

• Electrical fault outside the transformer in outgoing feeder

• For both outside and inside faults.

• Non of the above

What is the function of the fins or radiator fins in the transformer

• For Cooling transformer

• For lighting protection

• For earthing protection

• For over voltage protection

Which of the following does not change in a Transformer ??

• Current

• Voltage

• Frequency

• All of these

A transformer core is laminated to

• Reduce hysteresis loss

• Reduce eddy current losses

• Reduce copper losses

• All of these.

The Chemical used in Breather is

• Asbestos Fiber.

• Silica Sand.

• Sodium Chloride.

• Silica Gel

A transformer Oil must be Free from ?

• Water

• Sludge

• Moisture

• Ordor

If dc voltage is applied to the primary of a transformer it may:

• Work

• Burn the winding

• Give lower voltage on the secondary side

• Give higher voltage on the secondary side

Transformer ratings are usually expressed in terms of :

• Voltage

• KVA

• kWh

• KW

A common method of cooling a power transformer is ..............

• natural air cooling

• air blast cooling

• oil cooling

• any of the above