Types of Family Gases and Their Characteristics

What are the three types of family gases ?

• First, second, and third family gases

• Primary, secondary, and tertiary gases

• Alpha, beta, and gamma gases

• Initial, middle, and final gases

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

• The effectiveness of any flue;

• The supply of combustion air;

• Its operating pressure or heat input, or where necessary, both;

• Its combustion performance;

Why is an odourant added to natural gas and LPG?

• To improve combustion efficiency

• To help identify the presence of gas in the air

• To increase the energy content

• To reduce the cost of gas

Which chemical was originally used to add odour to gas?

• Diethyl sulphide

• Ethyl mercaptan

• Tetrahydrothiophene

• Methane

What are the more commonly used chemicals now for adding odour to gas?

• Methane and propane

• Diethyl sulphide and ethyl mercaptan

• Carbon dioxide and nitrogen

• Hydrogen and oxygen

How much odourant is typically used to give gas a recognisable smell?

• A large amount

• A moderate amount

• A tiny amount

• None

What does the toxicity of a gas imply?

• It is flammable.

• It is non-reactive.

• It is poisonous and can cause death if inhaled.

• It is odorless.

What was Town Gas (Family 1) originally processed from?

• Natural gas

• Coal

• LPG

• Oil

What harmful substance does Town Gas produce in its natural state?

• Carbon Dioxide

• Methane

• Carbon Monoxide

• Nitrogen

Which family of gases does not contain Carbon Monoxide and is non-toxic?

• Family 1

• Family 2

• Family 3

• Family 4