NCCER HVAC Level 1, Module 8 -
Soldering/Brazing Exam Q&A 100% Pass
What is a neutral flame? - ✔✔Equal parts oxygen and acetylene
What is a carburizing flame? - ✔✔A cooler flame used for light
brazing.
At what PSI does Acetylene become unstable? - ✔✔15 psi
What do you use to light a torch? - ✔✔Cup Striker
Why is it dangerous to use a lighter to light a torch? - ✔✔The
flame may travel back into the lighter and cause it to explode.
How far do you open the acetylene valve on the tank when
brazing? - ✔✔1/2 turn to a full turn
What is an alloy? - ✔✔Any substance made up of two or more
metals.
1
©NINJANERD 2024/2025. YEAR PUBLISHED 2024.
, What did the Federal Safe Drinking Water Act do? - ✔✔It banned
solders containing more than 0.2% of lead in piping for use in
potable (drinking) water systems.
What is the most common solder used on low pressure
applications and water lines? - ✔✔95% tin/5% antimony
What is 50/50 tin/antimony alloy used for? - ✔✔Suitable for
low/non pressure applications. Provides limited strength. NOT
suitable for water lines.
Oxygen is supplied in cylinders at pressures of about
_______________ psig. - ✔✔2,000 psig
Acetylene cylinders are pressurized to about _______________
psig. - ✔✔250 psig
In an oxy/acetylene setup, the oxygen hose is ______________
and the acetylene hose is _______________________. -
✔✔Oxygen-Green
Acetylene - Red
2
©NINJANERD 2024/2025. YEAR PUBLISHED 2024.
Soldering/Brazing Exam Q&A 100% Pass
What is a neutral flame? - ✔✔Equal parts oxygen and acetylene
What is a carburizing flame? - ✔✔A cooler flame used for light
brazing.
At what PSI does Acetylene become unstable? - ✔✔15 psi
What do you use to light a torch? - ✔✔Cup Striker
Why is it dangerous to use a lighter to light a torch? - ✔✔The
flame may travel back into the lighter and cause it to explode.
How far do you open the acetylene valve on the tank when
brazing? - ✔✔1/2 turn to a full turn
What is an alloy? - ✔✔Any substance made up of two or more
metals.
1
©NINJANERD 2024/2025. YEAR PUBLISHED 2024.
, What did the Federal Safe Drinking Water Act do? - ✔✔It banned
solders containing more than 0.2% of lead in piping for use in
potable (drinking) water systems.
What is the most common solder used on low pressure
applications and water lines? - ✔✔95% tin/5% antimony
What is 50/50 tin/antimony alloy used for? - ✔✔Suitable for
low/non pressure applications. Provides limited strength. NOT
suitable for water lines.
Oxygen is supplied in cylinders at pressures of about
_______________ psig. - ✔✔2,000 psig
Acetylene cylinders are pressurized to about _______________
psig. - ✔✔250 psig
In an oxy/acetylene setup, the oxygen hose is ______________
and the acetylene hose is _______________________. -
✔✔Oxygen-Green
Acetylene - Red
2
©NINJANERD 2024/2025. YEAR PUBLISHED 2024.
