Worksheet: Compressed Gases

In this worksheet, we will practice describing compressed gas cylinders and regulators and safe procedures for their use, transport, and replacement.

Q1:

Which of the following gas cylinders can always be used without a flashback arrestor?

  • AOxygen
  • BCarbon dioxide
  • CAcetylene
  • DHydrogen
  • EMethane

Q2:

A cylinder outlet has a left-hand thread. Which of the following gases could it contain?

  • AHydrogen
  • BOxygen
  • CNitrogen
  • DArgon
  • ECarbon dioxide

Q3:

Which of the following statements is true?

  • AAn acetylene cylinder outlet has a right-hand thread.
  • BA regulator outlet valve is closed by turning the knob counterclockwise.
  • CThe nut of a regulator must be tightened as much as possible when attaching it to a cylinder.
  • DA cylinder valve outlet is opened by turning it clockwise.

Q4:

After connecting a regulator to a gas supply, in which order should the following actions be performed?

  1. Check the cylinder outlet for leaks.
  2. Turn the regulator knob clockwise.
  3. Open the cylinder outlet valve.
  • A2, 1, 3
  • B3, 2, 1
  • C3, 1, 2
  • D1, 2, 3
  • E1, 3, 2

Q5:

Before disconnecting a regulator from a gas cylinder, in which order should the following actions be performed?

  1. Loosen the connection between the regulator and cylinder.
  2. Turn the regulator knob counter-clockwise.
  3. Close the cylinder outlet valve.
  • A2, 1, 3
  • B2, 3, 1
  • C3, 1, 2
  • D1, 2, 3
  • E3, 2, 1

Q6:

When transferring a regulator between gas cylinders, in which order should the following actions be performed?

  1. Turn the regulator knob fully counterclockwise.
  2. Attach the regulator.
  3. Open the cylinder valve outlet.
  • A3, 2, 1
  • B1, 3, 2
  • C2, 3, 1
  • D1, 2, 3
  • E2, 1, 3

Q7:

Which of the following items of clothing must be worn when moving a gas cylinder?

  • ASteel-toe boots
  • BInsulated gloves
  • CSafety helmet
  • DFace shield
  • ELab coat

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