9189 Phase 4 Combustion 1

What are the characteristics of natural gas and LPG?

• Natural gas is primarily methane, while LPG is a mixture of propane and butane.

• Natural gas is heavier than air, while LPG is lighter than air.

• Natural gas is stored in liquid form, while LPG is stored in gaseous form.

• Natural gas is odorless, while LPG has a strong natural odor.

Which of the following is an additional characteristic or property of LPG?

• LPG is colorless and odorless.

• LPG is heavier than air.

• LPG is non-toxic.

• LPG is a solid at room temperature.

Learner task – What does The Gas Regulations (GSIUR) Regulation 26(9) state regarding an operative who works on an appliance?

• An operative must ensure the appliance is left in a safe condition.

• An operative must report any faults to the supervisor.

• An operative must complete a logbook entry for each appliance.

• An operative must wear protective gear at all times.

What is added to natural gas (NG) and LPG to help identify if there is any gas present in the air?

• A) A colorant

• B) An odourant

• C) A sweetener

• D) A thickener

What was the chemical originally used to add odour to gas?

• Diethyl sulphide

• Ethyl mercaptan

• Tetrahydrothiophene

• Butyl mercaptan

True or False: Town Gas (Family 1) used to be processed from coal and produced Carbon Monoxide (CO) in its natural state.

• True

• False

Which gas family does not contain Carbon Monoxide (CO) and is therefore non-toxic?

• Family 1

• Family 2

• Family 3

• Family 4

What is the energy called that is given off when gas burns?

• Thermal energy

• Calorific value

• Kinetic energy

• Potential energy

The calorific value (CV) of gas in the UK is measured in the SI unit of ________ per cubic metre.

• megajoules

• kilojoules

• calories

• watts

What is the approximate calorific value (CV) of gas in the UK?

• 38.5 MJ/m³

• 40.0 MJ/m³

• 35.0 MJ/m³

• 42.0 MJ/m³