modulo 12

Which of the following can be used for oxy-fuel gas cutting?

• Nitrogen

• Carbon dioxide

• Argon

• Natural gas

What is the maximum withdrawal rate of an acetylene cylinder per hour?

• 10%

• 15%

• 20%

• 25%

Acetylene is often referred to as dissolved acetylene, but what is it dissolved in?

• Carbon dioxide

• Acetone

• Kapok

• Nitrogen

What is the approximate flame temperature of the pre-heating flames used in oxy-acetylene cutting?

• 2,500°C

• 3,000°C

• 3,200°C

• 4,000°C

Which of the following gases can be used for oxy-fuel cutting?

• Nitrogen

• Propane

• Carbon dioxide

• Argon

What is the main advantage of using a purpose built high pressure cutting torch?

• Less gas is used

• Safer, can cut thicker sections

• Provides maximum heat output

• Simpler design of nozzle

What does the term 'seat' refer to?

• The number of holes in a nozzle

• The position it occupies in the torch arrangement

• The ledges which mate with the head of the torch

• The rest on which the torch is supported during cutting

What is the most common cause of a rapid backfiring?

• Pressure too high

• Cutting speed too fast

• Pressure too low

• Using a propane nozzle

What is the approximate ignition temperature for steel?

• 500°

• 700°

• 900°

• 1000°

What is the main function of a flashback arrestor?

• Extinguish all gases

• Prevent a flame travelling back to the cylinder

• Protect hoses from catching fire

• To extinguish the flame at the nozzle