Soldering and Brazing

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Congratulations - you have completed Soldering and Brazing.

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Question 1

Soldered joints are used for applications in which the temperature does not exceed _____.

A	100°F
B	300°F
C	250°F
D	200°F

Question 2

Brazing is performed at temperatures greater than _____.

A	400°F
B	1,600°F
C	800°F
D	2,000°F

Question 3

Soldering uses heat and a(n) _____ filler metal.

A	stainless
B	iron
C	ferrous
D	nonferrous

Question 4

To clean copper tubing, use No. _____ steel wool.

A	03
B	01
C	02
D	00

Question 5

The BAg series of filler metals used to join copper tubing contains 30 to _____ percent silver.

A	45
B	60
C	35
D	90

Question 6

Cup depths for fittings used for brazing are _____ those for soldering.

A	the same as
B	longer than
C	larger than
D	shorter than

Question 7

Before moving oxygen and acetylene cylinders, the _____ must be in place.

A	protection caps
B	hoses
C	gauges
D	valves

Question 8

Acetylene becomes unstable above _____ psi.

A	10
B	15
C	5
D	20

Question 9

After brazing, a joint should be cleaned with _____.

A	sandpaper
B	a grinder
C	warm water
D	a file

Question 10

Tubing is purged during brazing to remove _____.

A	air
B	carbon dioxide
C	oxygen
D	refrigerant

Question 11

Capillary action of solder is most effective when the space between the tubing and the fitting is between _____.

A	0.20" and 0.50"
B	0.002" and 0.005"
C	0.02" and 0.05"
D	0.0002" and 0.0005"

Question 12

The flame produced by an air/acetylene torch is of a lower temperature than the flame produced by an oxygen/acetylene torch because _____.

A	less acetylene is used with air
B	air does not support combustion
C	the nitrogen in air burns at a lower temperature
D	more acetylene is used with oxygen

Question 13

The strength of a brazed joint results from the _____.

A	filler metal being completely adhered to the base metal
B	tubing-fitting clearance being zero
C	temperature of the heating process
D	type of tip used on the torch

Question 14

The flame type used in light brazing to prevent melting the base metal is _____.

A	nonfeathering
B	oxidizing
C	carburizing
D	neutral

Question 15

When the flame is properly adjusted for most brazing, you should hear a _____ sound.

A	blowing
B	popping
C	whistling
D	snapping

Question 16

A copper joint must never be soldered or brazed

A	when nitrogen is present in the tubing
B	when the system is open to the atmosphere
C	when the system is under pressure
D	when air is present in the system

Question 17

What safety device must always be present when using a torch

A	A striker
B	A wet rag
C	A fire extinguisher
D	A respirator

Question 18

When soldering or brazing, always

A	Adjust the acetylene to 40 psig
B	Adjust the oxygen to 70 psig
C	Use a lighter when igniting the torch
D	Wear the proper safety glasses

Question 19

What is the purpose of a heat shield?

A	It is used to absorb heat from a filter dryer when brazing
B	It is used to protect combustible material
C	It is used to add heat to a joint while brazing
D	It is used to help cool a joint after it has been soldered or brazed

Question 20

When using a torch to repair a system that is overhead,

A	Heat the male section of the joint only
B	Heat the female section of the joint only
C	Never stand directly under the torch
D	Heat the center of the joint only

Question 21

Brazing materials should not contain

A	Lead
B	Lead or tin
C	Flux
D	Cadmium

Question 22

When using torches while repairing copper tubing on a refrigeration system always

A	Use flux
B	Use silver solder
C	Use brazing material
D	Make sure the work area is well ventilated

Question 23

The pressure regulators on the oxygen/acetylene torch should

A	Always be tested for good working conditions
B	Be adjusted out for use
C	Be adjusted in after each use
D	Be disassembled and cleaned after each use

Question 24

Acetylene pressure should never exceed

A	5 psi
B	10 psi
C	15 psi
D	20 psi

Question 25

Soldering or brazing should never be attempted when

A	The system has been recovered
B	The system is under pressure
C	The system has been evacuated
D	The system has been retrofitted

Question 26

Oxygen/acetylene tanks and hoses should

A	Shut off and have the hoses bled after each use
B	Be correctly color coded
C	Be correctly labeled and identified
D	All of the above

Question 27

What is the proper source of ignition for an oxygen/acetylene torch?

A	A match
B	A lighter
C	A striker
D	Another torch

Question 28

A system must never be soldered or brazed

A	When it is at 0 psig
B	When nitrogen is inside the system
C	When it is in a slight vacuum
D	When under pressure

Question 29

When soldering or brazing a sealed system, first recover the refrigerant, then

A	Never open the system to the atmosphere
B	Open the system to the atmosphere
C	There must be a minimum of 20 psig present
D	Draw a vacuum of 20”Hg

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Soldering and Brazing

Soldering and Brazing

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