2-2-4 XFMR Construction

A transformer that is energized but not loaded can draw as much as __?__ of the current taken in by a loaded transformer of the same size.

5%

A dry type transformer is cooled by ventilators cut into the metal case.

true

Most distribution transformers are cooled by oil and air.

true

The main purpose of a transformer core is to direct the magnetic flux.

true

The best insulation for transformer coils is cotton.

False

If you use too small a fuse to test a transformer, it may blow due to exciting current.

True

More heat flows out of a transformer windings if __?__ or __?__ wire is used in the coils.

square, rectangular

The point where high voltage leads are brought out of a coil are considered critical points for insulation.

true

Distribution transformers normally have one primary coil and __?__ secondary coil(s).

two

Transformer bushings are manufactured using a __?__ process.

wet

Heat in a transformer core is generated because of the __?__ of molecules.

constant reversal

Two types of electrical transformer cores are __?__.

shell, core

Normal types of losses concerning electrical transformers are __?__.

copper, core

The thin, insulated sheets of steel in a transformer core reduce __?__ and __?__.

core loss, heating

Core-type transformers are best suited for low voltage and high currents.

false

Round wire is the only type used in transformer coils.

false

The high voltage winding is normally placed next to the core to increase EMF.

false

Transformer oil must have a __?__ strength.

high dielectric

The baked-on insulating compound used in transformer coils prevents __?__ from getting into the windings.

moisture, dust, dirt