NEETS MODULE 4; CHAPTER 2

Question 1

Western union splice?

Answer 1

Western Union splice joins small, solid conductors.

Bring the wires to a crossed position and make a long twist or bend in each wire

Question 2

Staggering Splices?

Answer 2

A smoother and less bulky joint can be made by
staggering the splices.

Short is connected to long end.

Question 3

Rattail Joint?

Answer 3

You then twist the wires to form the rattail effect. This type of splice will not
stand much stress

Question 4

Fixture Joint?

Answer 4

he first step is to remove the
insulation and clean the wires to be joined. After the wires are prepared, the fixture wire
is wrapped a few times around the branch wire. The end of the branch wire is then bent
over the completed turns. The remainder of the bare fixture wire is then wrapped over the
bent branch wire. Soldering and taping completes the job

Question 5

Knotted Tap Joint splice?

Answer 5

The main wire, to which the branch wire is to be tapped, has about 1 inch of insulation
removed. The branch wire is stripped of about 3 inches of insulation.

Question 6

what device is commonly used to replace the rat tail splice?

Answer 6

wire nut

Question 7

The ____ splice is used extensively to join large conductors.

Answer 7

split bolt

Question 8

Why are the ends of the wire clamped down after a Western Union splice is made?

Answer 8

To prevent damage to the tape insulation

Question 9

Why are splices staggered on multiconductor cables?

Answer 9

To prevent the joint from being bulky.

Question 10

An advantage of the crimp-on solderless terminal lugs?

Answer 10

is that they require relatively little
operator skill to use.

Another advantage is that the only tool needed is the crimping tool.

Question 11

. What are the two types of insulation most commonly used for noninsulated splices
and terminal lugs?

Answer 11

Spaghetti or heat-shrinkable tubing.

Question 12

What is the maximum allowable temperature that should be used on heat-shrinkable
tubing?

Answer 12

300º F

Question 13

electrolysis?

Answer 13

Electrolysis
is the chemical action that takes place when an electric current passes through two
dissimilar metals. This chemical action corrodes (eats away) the metal.

Question 14

The use of ______ terminal lugs and splices has become the most common method
for copper wire termination and splicing in recent years.

Answer 14

preinsulated

Question 15

What is the most common method of terminating and splicing wires?

Answer 15

The use of preinsulated splices and terminal lugs.

Question 16

Why are preinsulated terminal lugs and splices color coded?

Answer 16

To identify wire sizes they are to be used on.

Question 17

Why must items to be soldered be cleaned just prior to the soldering process?

Answer 17

. Solder will not adhere to dirty, greasy, or oxidized surfaces

Question 18

What does “tinning” mean in relationship to soldering?

Answer 18

The coating of the material to be soldered with a light coat of solder

Question 19

How much of the stripped length of a conductor should be tinned?

Answer 19

One-half the stripped length.

Question 20

A soldering gun should NOT be used on what components?

Answer 20

Electronic components, such as resistors, capacitors, and transistors

Question 21

What two metals are used to from soft solder?

Answer 21

Tin and lead

Question 22

. What is the tin-lead alloy percentage of solder used for electrical connectors,
splices, and terminal lugs?

Answer 22

60-percent tin and 40-percent lead (60/40 solder)

Question 23

What purpose does flux serve in the soldering process?

Answer 23

It cleans the metal by removing the oxide layer and prevents further oxidation
during the soldering

Question 24

Why are solvents used in the soldering process?

Answer 24

To remove contaminants from soldered connections.