Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
18 Cards in this Set
- Front
- Back
|
Which of the fallowing tools is different from the rest with respect to the shape of nut or the screw that it turns?
a. open end wrench b. combination wrench c. allen wrench d. adjustable wrench |
c. allen wrench
|
|
|
A wiring and crimping tool is used to?
a. crimp tubing b. cut and strip wire c. staple low voltage d. fasten insulation to duct |
b. cut and strip wire
|
|
|
Air conditioning and refrigeration reversible ratchet wrenches (also called fridge ratchets) are used to?
a. tighten hex head sheet metal screws b. open and close refrigerant service valves c. tighten flare nuts d. tighten nuts that cannot be reached with other wrenches |
b. open and close refrigerant service valves
|
|
|
Tube cutters are used to?
a. cut insulation for tubing b. cut iron pipe used for natural gas or liquified petroleum gas c. cut sheet metal duct d. cut copper tubing |
d. cut copper tubing
|
|
|
When soldering , why should flux be used?
a. it helps prevent oxidation b. it glues the pieces together c. It helps intensify the heat from the torch d. all the above are correct |
a. It helps prevent oxidation
|
|
|
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. none of the above |
a. the male part of the joint only
|
|
|
Soft solder should be used?
a. on the high side of the system b. on the low side of the system c. when there are extreme changes in pressures and temperatures d. on water pipe and drain lines only |
d. on water pipe and drain lines only
|
|
|
The size indicated for the diameter of ACR copper tubing is the approximate?
a. inside diameter b. outside diameter c. wall thickness d. none of the above |
b. outside diameter
|
|
|
The maximum temperature at which soft soldering is done is?
a. 1400 degF b. 212 degF c. 1200degF d. 800degF |
d. 800degF
|
|
|
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 |
c. higher temperatures than
|
|
|
When brazing, the filler rod 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 |
d. melted by heat from the tubing and fitting
|
|
|
True or false: Variable speed reversible electric drills can be used to drill holes as well at tighten and loosen screws
|
true
|
|
|
True or false: An instrument called a clamp on ammeter is so called because the tongs can clamped around a wire
|
True
|
|
|
True or false: When installing a refrigeration system, the piping should be connected with as few joints as possible
|
true
|
|
|
True or false: When tubing is cut with a tubing cutter, a burr is produced in the process. This slight decrease in the diameter of the tube can adversely affect the operation of the system
|
true
|
|
|
True or false: The use of flux is always required when soldering or brazing
|
false
|
|
|
True or false: an air acetylene torch with the proper type tip may be used for both low - and high temp soldering
|
true
|
|
|
True or false: refrigeration tubing and plumbing tubing are interchangeable
|
false
|
