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How far should you open a fuel gas cylinder?

  1. Half a turn

  2. 3/4 of a turn

  3. 1 1/2-2 turns

  4. Fully open

The correct answer is: 1 1/2-2 turns

Fuel gas cylinders should be opened between 1 1/2-2 turns. Fully opening the cylinder can lead to uneven distribution of gas and can potentially cause injury. Half a turn and 3/4 of a turn are not enough to properly open the cylinder and can lead to leakage. It is important to follow the specific guidelines for opening a fuel gas cylinder to ensure safety and efficiency.