問題一覧
1
There is a universal flux for soldering and brazing.
false
2
The suggested shade number for filter lenses for soldering is _______
2
3
ACR means air conditioning and refrigeration. T/F
True
4
COpper is considered to be a non-ferrous metal.. T/F
True
5
Flux should be applied with your fingers. T/F
false
6
Select types of copper tube joints
compression, soldered, brazed, flare
7
Cylinders whether full or empty shall not be used ________ or supports.
rollers
8
Fluxes are classified into what general groups?
intermediate, non corrosive, highly corrosive
9
Soldering is done at teperatures above 840°F. T/F
false
10
Hose connections shall be kept free of______ an
oil
11
For copper types K,L and M the outside diameter is the same. T/F
True
12
The primary purpose of flux is to chemically clean.
true
13
Torches shall be lighted by _____ lighters or otl aproved devices
friction
14
ACR copper is capped at the manufacturer to precent tube contamination.
true
15
What rules should be observed when using paste solders?
all of the above
16
A capillary action is the flow of liquid when drawn into large space between dry surfaces. T/F
false
17
The suggested shade number for fitler lenses for torch brazing is a number ______
3-4
18
The maximum service temperature copper brazed joints is 450°F. T/F
false
19
Heat effects the rate of oxidation on metals. T/F
True
20
Types K, L and DWV are all considered to be water tube.
false
21
When using a brazing alloy containing cadmuim beware of toxic fumes. T/F
True
22
The maximum service temperature copper soldered joints is 350°F.
false
23
An alloy is an intimate mixture of two or more metals.
true