The electrodes are manufactured in two standard lengths namely

12) The correct colours for oxygen and acetylene hoses are:

Red for oxygen and blue for acetylene

Black for oxygen and red for acetylene

Black for oxygen and maroon for acetylene

Red for oxygen and maroon for acetylene

Answer is:

Black for oxygen and maroon for acetylene

Explanation:

Black for oxygen hose and maroon for acetylene hose.

13) In an acetylene cylinder, the acetylene is dissolved in

Answer is:

Acetone

Explanation:

Acetylene is normally dissolved in a solvent, typically acetone, at pressures up to 19 barg (275 psig) at 20°C (68°F). The dissolved acetylene is packaged in specially designed cylinders filled with a porous material to prevent voids where gaseous acetylene could collect.