Electrical Transformer Quiz #5

The amount of copper in the primary is ….. that of secondary.

A transformer has full load copper loss of 400 W. The copper loss at half full load will be …..

A transformer has 200 W as an iron loss at full load. The iron loss at half full-load will be …..

In a practical transformer, copper losses account for about ….. of the total losses.

With a load of leading power factor, the full load secondary voltage of the transformer is ….. its no-load voltage.

Which of the following is not the basic elements of the transformer?

In an ideal transformer ……

The main purpose of using core in the transformer is to …..

The transformer core is laminated in order to …..

The primary and secondary induced EMF E1 and E2 in a two winding transformer are always …..

A step-up transformer increases …..

The primary and secondary winging of an ordinary two winding transformer always have …..

In a transformer, the leakage flux of each winding is proportional to the current in that winding because,

In a two winding transformer, the EMF per turn in the secondary winding is always ….. the induced EMF power turn in the primary.

In relation to a transformer, the ratio 20:1 indicates that …..

In performing the short circuit test of a transformer …..

A transformer has negative voltage regulation when its load power factor is …..

No-load test on a transformer is carried out to determine …..

The main purpose of performing an open circuit test on a transformer is to measure its …..

During the short circuit test, the iron loss of a transformer is negligible because, …..

In operating a 400 Hz transformer at 50 Hz …..

Transformer is rated in kVA instead of kW because, …..

When 400 Hz transformer is operated at 50Hz its kVA rating is …..

A relatively light load, transformer efficiency is low because,

The ordinary efficiency of a given transformer is maximum when …..