Quiz 3

Question 1

Which voltage rating has the lowest current at 5,000 watts? Using the power formula, calculate the amperage and write next to answer.

Answer 1

480 volts. 10.4 amps

Question 2

Transformers work off Direct Current?

Answer 2

False

Question 3

A 120/208 transformer’s coils are in a _____ configuration.

Answer 3

Wye

Question 4

A 480 volt transformer that step down voltage to 120 volts has a ration of…

Answer 4

4 to 1

Question 5

What does the acronym EMF stand for?

Answer 5

Electromagnetic force

Question 6

You are installing a 120 volt to 24 volt transformer for a control circuit. The 120 volts would be attached to terminals labeled _______

Answer 6

H1, H2

Question 7

Using Ohms law find the resistance of a 240 volt 20 amp space heater

Answer 7

12 ohms

Question 8

What is used in a transformer to cool and insulate the windings?

Answer 8

Oil

Question 9

A _______ in a transformer allows you to increase voltage by variable turns in the coil

Answer 9

Tap changer

Question 10

Label each winding as wye or delta

Answer 10

Y (Why)
Δ (Delta)