Combustion and Flame Quiz 2

What is a fuel?

• A substance that burns rapidly

• A substance with a high calorific value

• A substance that is burned to produce energy

• A substance with a low ignition temperature

When a substance gives off heat after reacting with oxygen, it is called

• fire

• oxidation

• roasting

• combustion

Substances that burn in air are called

• hygroscopic

• inflammable

• combustible

• oxidising agent

The lowest temperature at which a substance catches fire is called

• lighting temperature

• combustion temperature

• ignition temperature

• burning temperature

Inflammable substances have ______ ignition temperature

• high

• very high

• very low

• low

Water is not used to control fires involving electrical equipment. Give reason.

• Water is a good conductor of electricity.

• Water can damage the electrical equipment
• Water can create a chemical reaction with the fire
• Water can cause the fire to spread

Which is an inflammable substance?

• Petrol

• LPG

• CNG

• All of the above

LPG is a better domestic fuel than wood. Give reason.

• Burning LPG does not produce harmful substances

• Wood produces more smoke than LPG

• LPG has a higher calorific value

• All of these

Which is the hottest part of a flame?

• blue zone

• yellow zone

• red zone

• black zone

An ideal fuel has which of the following characteristics?

• high calorific value

• low calorific value

• high ignition temperature

• moderate ignition temperature

• low ignition temperature