Exam 4: Transformers: Efficiency, Design, and Testing

An ideal transformer is one which has

A shell-type transformer has

Negative voltage regulation is indicative that the load is

The secondary winding of which of the following transformers is always kept closed?

Iron loss of a transformer can be measured by

When a given transformer is run at its rated voltage but reduced frequency, its

When secondary of a current transformer is open-circuited its iron core will be

Short circuit test on transformers is conducted to determine

If the supply frequency to the transformer is increased,"the iron loss will

An ideal transformer will have maximum efficiency at a load such that

The size of a transformer core will depend on

The changes in volume of transformer cooling oil due to variation of atmospheric temperature during day and night is taken care of by which part of transformer

Which of the following is the main advantage of an auto-transformer over a two winding transformer ?

The transformer laminations are insulated from each other by

Open circuit test on transformers is conducted to determine

For the parallel operation of single phase transformers it is necessary that they should have

Power transformers are generally designed to have maximum efficiency around

In an actual transformer the iron loss remains practically constant from noload to fullload because

N atural air coo ling is generally restricted for transformers up to

During short circuit test iron losses are negligible because