transformer construction Flashcards
Round wire is the only type used in transformer coils.
false
More heat flows out of transformer windings if ? or ? wire is used in the coils.
square / rectangular
The best insulation for transformer coils is cotton.
false
The baked-on insulating compound used in transformer coils prevents ? from getting into the windings.
moisture,dust,dirt
The points where high voltage leads are brought out of a coil are considered critical points for insulation.
true
The high voltage winding is normally placed next to the core to increase EMF.
false
The thin, insulated sheets of steel in a transformer core reduce ? and ? .
core loss / heating
The main purpose of a transformer core is to direct the magnetic flux.
true
Two types of electrical transformer cores are ? .
shell and core
Core-type transformers are best suited for low voltage and high currents.
false
Transformer bushings are manufactured using a ? process.
wet
Normal types of losses concerning electrical transformers are ?
copper and core
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%
If too small a fuse is used to test a transformer, it may blow due to exciting current.
true
Heat in a transformer core is generated because of the ? of molecules.
constant reversal
