Chapter 7
A common filler material used for brazing is composed of....
15% to 60% silver
How many perfect threads should there typically be at the end of the threaded section?
7
Which two types of plastic pipe can typically withstand temperatures up to 180F?
ABS and CPVC
The spring-type and lever-type are two kinds of...
Benders
The most important thing to keep in mind when using a press-type mechanical pipe connecting tool is to...
Carefully read and follow all tool manufacturer's instructions.
Steel pipe is referred to as galvanized pipe when it is...
Coated with zinc.
When joining sections of PVC pipe together with a union, it is always recommended to...
Deburr ends of pipe and clean with primer.
Flux is used to...
Help prevent oxidation from forming
The size of 1/2" would refer to the _____ with regard to copper tubing used in plumbing and heating.
ID (inside diameter)
For black pipe most sizes under 12", the nominal pipe size refers most closely to the...
Inside diameter of the pipe
Why is a hacksaw not the preferred tool for cutting copper tubing?
It produces a large amount of burrs and filings
The size of 1/2" would refer to the _____ with regard to ACR copper tubing.
OD (outside diameter)
Correctly installed refrigerant piping circuits help prevent...
Oil return and excess refrigerant
What is the most common cause of leaking compression fittings?
Overtightening the compression nut.
Which heat source has the hottest flame?
Oxyacetylene torch
The suction line on an air-conditioning or refrigeration system is insulated to...
Prevent line sweating and prevent the absorption of additional heat.
The process of expanding one end of a section of tubing so that another section of the same size tubing can be inserted into it is called...
Swaging
Which of the following statements is true regarding the flaring of copper tubing?
The flare nut is placed on the end of the tubing before the flare has been created.
When swaging the tubing should stick out the flaring block a distance that is approximately equal to...
The outside diameter of the tubing plus 1/8"
The standard weight of copper tubing used most frequently in the heating and air-conditioning industry is...
Type L
The portion of a compression fitting that actually tightens against the tubing to create the leak-free seal is the...
ring or ferrule
