Deck 7: Tubing and Piping

Question 1

The size indicated for the diameter of ACR copper tubing is the ____.

A) inside diameter
B) outside diameter
C) wall thickness
D) None of the above.

Answer 1

B

Question 2

The size indicated for the diameter of copper tubing used for plumbing is the ____.

A) inside diameter
B) outside diameter
C) wall thickness
D) None of the above.

Answer 2

A

Question 3

The proper type of flame from an oxyacetylene torch for silver brazing is ____.

A) long tail flame
B) neutral flame
C) oxidizing flame
D) carbonizing flame

Answer 3

B

Question 4

K-type copper is heavy duty with a thick tubing wall.

Question 5

DWV copper stands for drain, waste and vent and is also a lightweight copper not typically used in the HVACR industry as far as refrigerant-carrying applications are concerned.

Question 6

For cleaning ACR copper tubing before soldering, a material that can be used is ____.

A) steel wool
B) carborundum cloth
C) sand cloth
D) nylon wool

Question 7

When joining steel pipe, a ____ should be applied to the threads before connecting.

A) pipe dope
B) flux
C) solder
D) gasket

Question 8

M is a lightweight copper and is not commonly used in our industry.

Question 9

When soldering or brazing, the solder is ____.

A) heated directly by the flame of the heat source
B) heated by the surrounding air
C) used to oxidize the metal
D) melted by heat from the tubing and fitting

Question 10

L-type copper is considered medium weight and is used most frequently.

Question 11

Filler materials used in the high temperature connection of copper joints are composed of ____.

A) 50/50 tin-lead
B) 95/5 tin-antimony
C) 15%-60% silver
D) bronze

Question 12

Pipe threads, when used on pipe that will contain liquid or vapor under pressure, ____.

A) are tapered
B) should have at least seven perfect threads
C) generally have a "V" shape
D) All of the above.

Question 13

When tubing is cut with a tubing cutter, a burr is produced in the process. This slight decrease in the inside diameter of the tube can adversely affect the operation of the system.

Question 14

Molten solder flows between the two base metals being soldered because ____.

A) the atmospheric pressure pushes it in
B) of capillary attraction
C) there are no surface pores in the base metal
D) the tubing surface melts and the pressure differential forces it in

Question 15

If a technician needed 5/8" ACR for an installation and was located near only a plumbing supply house, what size and type of pipe should he ask for?

A) 5/8" ACR.
B) 1/2" PVC.
C) 1/2" ID Copper.
D) 5/8" PVC.

Question 16

When soldering, why should flux be used?

A) It helps prevent oxidation.
B) It helps keep pipes clean.
C) It helps solder flow easier.
D) All of the above are correct.

Question 17

Pipe threads are standardized by the A.N.S. A.N.S. stands for ____.

A) All Nominal Standard
B) American National Standard
C) All New Steel
D) Apparent Nominal Standard

Question 18

Brazing is done at ____ soldering.

A) the same temperature as
B) lower temperatures than
C) higher temperatures than
D) temperatures that can be higher or lower than

Question 19

The maximum temperature at which soft soldering is done is ____.

A) 212°F
B) 400°F
C) 600°F
D) 842°F

Question 20

When soldering, flux should be applied to ____.

A) the male part of the joint only
B) the female part of the joint only
C) both the male and female parts of the joint
D) around the mated parts

Question 21

The tubing or pipe for natural gas supply to a gas heating unit is ____________________.

Question 22

When installing a refrigeration system, the piping should be connected with as few joints as possible.

Question 23

Four tools that are needed to properly prepare and thread steel pipe are the pipe cutter, reamer, threader, and ____________________.

Question 24

In order to thread steel pipe, ____________________ is applied so friction and heat do not damage the pipe and/or cutting dies .

Question 25

Why should some refrigerant lines be insulated?

Question 26

The use of flux is always required when soldering or brazing.

Question 27

The abbreviation for the plastic pipe used in hot and cold water supply systems is ____________________.

Question 28

When soldering, the technician should heat the solder with the torch to allow it to melt.

Question 29

95/5 tin-antimony solder can be used in any part of a refrigeration system.

Question 30

In the thread specification 1/2-14 NPT, the NPT stands for ____________________.

Question 31

In the thread specification 1/2-14 NPT, the 1/2 is the ____________________.

Question 32

The abbreviation for the plastic pipe used in systems for water drains, waste drains, and low-temperature vents is ____________________.

Question 33

ABS and PVC pipe can be used to carry the new blended refrigerants in low temperature applications.

Question 34

The end of a piece of a steel pipe is reamed after it is cut with a pipe cutter to make it easier to start the thread die.

Question 35

In the thread specification 1/2-14 NPT, the 14 stands for ____________________.

Question 36

The copper tubing used in the field piping of refrigeration systems is type ____________________.

Question 37

The abbreviation for the plastic pipe used in systems for water and gas supply lines and irrigation systems is ____________________.

Question 38

One reason for insulation on a suction line is to help maintain the proper ____________________.

Question 39

An air-acetylene unit usually consists of a B tank of acetylene gas, a regulator, a hose, and a torch .

Question 40

The abbreviation for the plastic pipe used in high pressure systems at low temperature is ____________________.

Question 42

When soldering, by what force, the molten filler material flows between the two base metals ?

Question 43

What are two purposes for using insulation on the suction line?

Question 44

The type of steel pipe thread used primarily in this industry is the "tapered" thread. Why?

Question 45

When making a swage joint, what should the depth of the enlarged portion of the tube be?