Domestic fuels systoms

What is the main characteristic of complete combustion?

• It requires less air compared to incomplete combustion.

• It produces a yellow flame with no definition.

• It produces carbon monoxide.

• It produces a stable blue flame with a defined shape.

Answer explanation

The main characteristic of complete combustion is that it produces a stable blue flame with a defined shape, indicating efficient fuel burning with sufficient oxygen, unlike incomplete combustion which can produce yellow flames and carbon monoxide.

What is the chemical equation for the complete combustion of natural gas?

• CH4 + O2 → CO + H2O

• 2O2 + CH4 → CO2 + 2H2O

• CH4 + O2 → CO2 + H2O

• CH4 + 2O2 → CO2 + 2H2O

Answer explanation

The complete combustion of natural gas (CH4) requires oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). The balanced equation is 1 CH4 reacting with 2 O2 to yield 1 CO2 and 2 H2O, represented as 2O2 + CH4 → CO2 + 2H2O.

What is produced during incomplete combustion instead of carbon dioxide?

• Oxygen

• Sulphur

• Water

• Carbon monoxide

Answer explanation

During incomplete combustion, there is not enough oxygen to produce carbon dioxide, leading to the formation of carbon monoxide instead. This gas is toxic and a common byproduct of such combustion processes.

How much air is required for the complete combustion of 1 kg of fuel?

• 20 kg

• 10 kg

• 5 kg

• 2 kg

Answer explanation

For complete combustion, approximately 10 kg of air is needed for every 1 kg of fuel. This is based on the stoichiometric ratio of fuel to air required for combustion, making 10 kg the correct answer.

What is a visible sign of incomplete combustion?

• A yellow flame with no definition

• A large amount of heat

• No soot deposits

• A stable blue flame

Answer explanation

A yellow flame with no definition indicates incomplete combustion, as it suggests that not all fuel is burning efficiently. In contrast, a stable blue flame signifies complete combustion.

What is the primary role of the Regulations concerning the safe storage of fuels?

• To increase the cost of fuel storage

• To ensure the health and safety of the customer, installer, and property

• To reduce the amount of fuel used

• To make fuel storage more complicated

Answer explanation

The primary role of the Regulations concerning the safe storage of fuels is to ensure the health and safety of the customer, installer, and property, preventing accidents and hazards associated with fuel storage.

Why are the Regulations surrounding gas fuels such as natural gas and LPG more stringent than others?

• Because gases are cheaper

• Because gases are visible

• Because gases cannot be seen but are explosive and flammable

• Because gases are easier to store

Answer explanation

The regulations for gas fuels like natural gas and LPG are stricter because they are invisible, yet highly explosive and flammable, posing significant safety risks if not properly managed.

Which regulations apply to both natural gas and LPG installations?

• The Gas (Installation and Use) Regulations

• Building Regulations Approved Document J 2013

• The 18th edition of the IET wiring Regulations

• None of the above

Answer explanation

The Gas (Installation and Use) Regulations apply to both natural gas and LPG installations, ensuring safety and proper usage. The other options do not cover both types of gas installations.

What does the Building Regulations Approved Document J 2013 cover?

• Natural gas and LPG installations

• Solid and oil fuels and the requirements for storage and safe handling

• Safe installation of electrical supplies and earthing systems

• None of the above

Answer explanation

Building Regulations Approved Document J 2013 specifically addresses solid and oil fuels, detailing the requirements for their storage and safe handling, making this the correct choice.

Which edition of the IET wiring Regulations covers the safe installation of electrical supplies and earthing systems?

• 16th edition

• 17th edition

• 18th edition

• 19th edition

Answer explanation

The 18th edition of the IET Wiring Regulations is the latest version that addresses the safe installation of electrical supplies and earthing systems, ensuring compliance with current safety standards.