XFMRS Week 1 Tuesday

What are the three main internal components of a transformer?

pg. 16

• Core, Windings, insulating fluid

• Core, internal breaker, insulating fluid

• windings, case ground, fuse

• insulating fluid, pressure relief valve, PCBs

What are the two transformer core configurations?

pg.17

• Primary and Secondary windings

• Wound type and shell type

• Iron and copper

• Turns ratio

What is the main purpose of the transformer core?

pg.17

• Gives the transformer its weight

• Reduces the efficiency of the transformer

• Improves the efficiency of the transformer

• Holds the windings in place

The primary windings in a transformer are typically _____ in wire size than the secondary windings.

pg.18

• Smaller

• Bigger

• Same size

How are the ends of the secondary windings in a transformer tagged?

pg.18

• E-F-G-H

• A-B-C-D

• The windings aren't tagged

• x1, x2, x3

How does the insulating fluid in a transformer cool the transformer?

pg.19

• Induction

• Convection

• Capacitance

• When de-energized

This harmful substance used to be part of the insulating fluid in older transformers but is now prohibited in new transformers.

pg.19

• Polychlorinated Biphenyls

• Mineral oil

• SF6 gas

• Asbestos

The pressure relief valve is designed to vent at approximately ___ psi?

pg.21

• 20psi

• 10psi

• When there is a internal short

• 15psi

A CSP transformer must be de-energized to replace the internal fuse.

pg.22

• True

• False

Why is copper the most popular material for transformer windings?

pg.18

• high resistance/high conductivity

• low resistance/high conductivity

• low resistance/low conductivity

• high resistance/low conductivity