XFMRS Week 1 Wednesday

A coil of wire will become energized if it is placed close to another coil of wire that is attached to a source of DC power.

pg.26

• False

• True

What phenomenon happens in a transformer that allows a transformer to convert voltage to another voltage?

pg.96

• Induction

• Capacitance

• Resistance

• Transform

What part of the transformer maximizes induction?

pg.26

• Primary winding

• Secondary winding

• Transformer core

• KVA

Transformers can work properly on both AC and DC.

pg.28

• False

• True

What allows transformers to change the amount of induced voltage between the primary and secondary windings?

pg.28

• Induction

• Number of turns in the primary coil

• Number of turns in the secondary coil

• Turns ratio

What is the comparison of the number of turns of wire in each coil of a transformer?

pg.29

• Turns ratio

• Mutual induction

• AC/DC

• Primary amps/Secondary amps

How do you calculate turns ratio?

pg.29

• Primary voltage x Secondary voltage

• Primary voltage rating divided by secondary voltage rating

• Primary voltage - Secondary voltage

• Primary voltage + Secondary voltage

What does the direction the secondary coil is wrapped in relation to the primary coil determine?

pg.30

• Turns ratio

• Induction

• Polarity

• Secondary voltage

What is the polarity when looking at a pole mounted transformer and the secondary bushings are oriented as x3, x2, x1?

pg.30

• Additive

• Subtractive

What is the polarity of transformers with KVA rating of 200 or smaller and primary rating of 8,660 and below?

• Additive

• Subtractive