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Brazing and hot work questions for the Refrigeration and air conditioning (RAAC) specialist test

5 free questions on Brazing and hot work, from section E. Specialist: HVACR – refrigeration and air conditioning. Every question is original and explains why each option is right or wrong.

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Question 1

Easier ·Link to this question (question 1)

You are brazing copper pipework next to timber in a ceiling void.

What should you do before starting?

Choose one answer.

  1. A. Brazing never causes fires
  2. B. Work with the torch flame turned up high
  3. C. Leave as soon as the joint is done
  4. D. Clear or protect combustible materials
Show the answer and explanation

Answer: D

  • A. Wrong: Wrong. Hot work causes fires.
  • B. Wrong: Wrong. That adds to the fire risk.
  • C. Wrong: Wrong. Keep watch for fire.
  • D. Right: Right. HSE lists clearing the area of combustible materials as a hot work precaution.

Explanation

Clear combustibles before brazing, have an extinguisher ready and keep watch.

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Question 2

Easier ·Link to this question (question 2)

You are setting up to braze on a site.

What should you have ready?

Choose one answer.

  1. A. A suitable fire extinguisher
  2. B. A spare gas bottle next to the work
  3. C. A can of spray paint for touch-ups
  4. D. A radio for entertainment
Show the answer and explanation

Answer: A

  • A. Right: Right. HSE lists suitable fire extinguishers as a hot work precaution.
  • B. Wrong: Wrong. That adds fuel.
  • C. Wrong: Wrong. Aerosols are flammable.
  • D. Wrong: Wrong. That doesn't help with fire.

Explanation

Have a suitable fire extinguisher ready during brazing and other hot work.

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Question 3

Medium ·Link to this question (question 3)

Many trades are doing hot work on a big refit.

What can help manage the risk?

Choose one answer.

  1. A. Removing the extinguishers
  2. B. A permit to work system
  3. C. Letting each trade do as it likes
  4. D. Doing all hot work in one go
Show the answer and explanation

Answer: B

  • A. Wrong: Wrong. Extinguishers are needed.
  • B. Right: Right. HSE says a permit to work system can help manage the hot work risk on larger projects.
  • C. Wrong: Wrong. Hot work needs managing across the project.
  • D. Wrong: Wrong. Timing doesn't control the risk.

Explanation

On bigger projects, a permit to work system helps manage hot work.

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Question 4

Medium ·Link to this question (question 4)

You are soldering small pipe joints with a rosin-based flux in a small room.

What does HSE say about the fume?

Choose one answer.

  1. A. It only smells, so it can't do you any harm at all
  2. B. It is good for clearing your nose
  3. C. Rosin in the flux can harm health
  4. D. It is just harmless steam
Show the answer and explanation

Answer: C

  • A. Wrong: Wrong. HSE warns about rosin.
  • B. Wrong: Wrong. HSE warns about rosin.
  • C. Right: Right. HSE says serious health problems can come from rosin (colophony) in solder fluxes.
  • D. Wrong: Wrong. HSE warns about rosin.

Explanation

Rosin (colophony) in solder flux fume can harm health. Control the fume.

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Question 5

Medium ·Link to this question (question 5)

You are brazing for most of the morning in a plant room.

What does HSE say you should do during the work?

Choose one answer.

  1. A. Wedge the fire doors open
  2. B. Cover the smoke detector
  3. C. Leave the torch lit between joints
  4. D. Keep a careful watch for fire
Show the answer and explanation

Answer: D

  • A. Wrong: Wrong. Fire doors slow the spread of fire.
  • B. Wrong: Wrong. Detectors must stay working.
  • C. Wrong: Wrong. Turn it off when not in use.
  • D. Right: Right. HSE says maintain a careful watch throughout hot work.

Explanation

Keep a careful watch for fire throughout hot work.

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