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Working on rooftop plant questions for the Refrigeration and air conditioning (RAAC) specialist test

5 free questions on Working on rooftop plant, 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 need to reach a condenser on a warehouse roof. Nobody knows what the roof is made of.

How should you treat it?

Choose one answer.

  1. A. As fragile until confirmed
  2. B. As safe, as it is already holding up the condenser unit
  3. C. As safe if you walk carefully
  4. D. As safe if it isn't raining
Show the answer and explanation

Answer: A

  • A. Right: Right. HSE says treat all roofs as fragile until a competent person has confirmed they are not.
  • B. Wrong: Wrong. Treat it as fragile until confirmed.
  • C. Wrong: Wrong. Treat it as fragile until confirmed.
  • D. Wrong: Wrong. Treat it as fragile until confirmed.

Explanation

Treat every roof as fragile until a competent person confirms otherwise.

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Question 2

Medium ·Link to this question (question 2)

Your route to a rooftop unit passes painted-over rooflights.

What does HSE say?

Choose one answer.

  1. A. Put a cone on top of each one
  2. B. Protect them with secured covers
  3. C. Step around them, they are easy to see
  4. D. Walk on them, as the paint makes the plastic stronger
Show the answer and explanation

Answer: B

  • A. Wrong: Wrong. A cone won't stop a fall.
  • B. Right: Right. HSE says fragile rooflights are a particular hazard, some hidden by paint, and must be protected, for example with secured covers labelled with a warning.
  • C. Wrong: Wrong. Painted rooflights can be hard to see.
  • D. Wrong: Wrong. Paint doesn't make them strong.

Explanation

Protect fragile rooflights, for example with secured, labelled covers.

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Question 3

Medium ·Link to this question (question 3)

You will work near the edge of a flat roof to service a unit.

What edge protection does HSE say flat roofs need?

Choose one answer.

  1. A. A row of cones near the edge
  2. B. None, as long as you stay a step back from the edge
  3. C. Double guard rail and toe board
  4. D. A strip of tape along the edge
Show the answer and explanation

Answer: C

  • A. Wrong: Wrong. Cones won't stop a fall.
  • B. Wrong: Wrong. Edge protection is needed.
  • C. Right: Right. HSE says flat roofs need edge protection, such as a double guard rail and toe board.
  • D. Wrong: Wrong. Tape won't stop a fall.

Explanation

Flat roof edges need a double guard rail and toe board.

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Question 4

Medium ·Link to this question (question 4)

A guard rail has been fitted around rooftop plant.

How high must the top rail be, at least?

Choose one answer.

  1. A. 500 mm, about knee height
  2. B. 700 mm, below the waist
  3. C. Any height, if there is a toe board
  4. D. 950 mm
Show the answer and explanation

Answer: D

  • A. Wrong: Wrong. The minimum is 950 mm.
  • B. Wrong: Wrong. The minimum is 950 mm.
  • C. Wrong: Wrong. The minimum is 950 mm.
  • D. Right: Right. HSE says for construction work the top guard rail should be at least 950 mm above the working surface.

Explanation

Top guard rails: at least 950 mm, with gaps no more than 470 mm.

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Question 5

Medium ·Link to this question (question 5)

Your job on a roof unit will take only a few minutes.

What access does HSE say may be used for short work like this?

Choose one answer.

  1. A. Secured ladders and roof ladders
  2. B. Climbing the drainpipe
  3. C. An unsecured ladder, as the job is only quick
  4. D. Standing on the unit itself
Show the answer and explanation

Answer: A

  • A. Right: Right. HSE says for short duration work, measured in minutes, properly secured ladders and proper roof ladders may be used.
  • B. Wrong: Wrong. That is not access equipment.
  • C. Wrong: Wrong. Ladders must be secured.
  • D. Wrong: Wrong. That isn't safe access.

Explanation

For work measured in minutes, secured ladders and proper roof ladders may be suitable.

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