transform quiz

No load on a transformer is carried out to determine

• efficiency of the transformer

• magnetising current and loss

• copper loss

• magnetising current

The power transformer is a constant

• voltage device

• main flux device

• power device

• current device

Material used for construction of transformer core is usually

• copper

• wood

• silicon steel

• aluminum

The path of the magnetic flux in transformer should have

• low resistance

• high resistance

• low reactance

• high reluctance

During short circuit test iron losses are negligible because

• the current on secondary side is negligible

• the voltage on secondary side does not vary

• the voltage applied is low

• full load current is not supplied to the transformer

The function of breather in a transformer is

• to arrest flow of moisture when outside air enters the transformer

• to provide oxygen inside the tank

• to cool the transformer coil

• to cool the coils during reduced load

A good voltage regulation of a transformer means

• difference between primary and secondary voltage is maximum

• output voltage fluctuation with power factor is least

• difference between primary and secondary voltage is least

• output voltage fluctuation from no load to full load is least

A no load test is performed on a transformer to

• copper loss

• efficiency

• core loss

• magnetising current and loss

While conducting short circuit test on a transformer the following side is short circuited

• primary side

• secondary side

• high voltage side

• low voltage side

The purpose of providing an iron core in a transformer is to

• decrease the reluctance of the magnetic path

• reduce eddy current losses

• provide support to windings

• reduce hysteresis loss