Combustion and Flame Quiz
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Questions and Answers

What is combustion?

  • The process of solidifying a substance in the presence of air to produce heat and light
  • The process of burning a substance in the presence of air to produce heat and light (correct)
  • The process of cooling a substance in the presence of air to produce heat and light
  • The process of burning a substance without the presence of air to produce heat and light

What is the essential requirement for combustion?

  • Nitrogen
  • Oxygen (correct)
  • Carbon dioxide
  • Hydrogen

What is ignition temperature?

  • The temperature at which a non-combustible substance catches fire
  • The highest temperature at which a combustible substance catches fire
  • The lowest temperature at which a combustible substance catches fire (correct)
  • The temperature at which a substance freezes

How can fire be controlled?

<p>By removing one or more requirements essential for producing fire (B)</p> Signup and view all the answers

What is an ideal fuel?

<p>Cheap, readily available, high calorific value, and does not produce polluting gases or residues (C)</p> Signup and view all the answers

What is the lowest temperature at which a combustible substance catches fire?

<p>Ignition temperature (B)</p> Signup and view all the answers

Which type of combustion involves a sudden increase in volume and release of gas?

<p>Explosion (C)</p> Signup and view all the answers

What are the three different zones of a flame?

<p>Luminous zone, non-luminous zone, dark zone (B)</p> Signup and view all the answers

What is the common method used to control fires involving electrical equipment or oils?

<p>Carbon dioxide extinguisher (E)</p> Signup and view all the answers

What is the unit used to express fuel efficiency?

<p>Kilojoule per kg (C)</p> Signup and view all the answers

Study Notes

Combustion Basics

  • Combustion is a chemical reaction between a fuel and an oxidizer that results in the release of heat and light energy.
  • The essential requirement for combustion is the presence of fuel, oxygen, and heat.

Ignition Temperature

  • Ignition temperature is the minimum temperature required for a fuel to ignite.

Fire Control

  • Fire can be controlled by removing one or more of the essential requirements for combustion (fuel, oxygen, or heat).
  • Electrical equipment or oil fires can be controlled using a non-conductive extinguishing agent, such as carbon dioxide or dry powder.

Fuels

  • An ideal fuel is one that is easily ignited, burns smoothly, and releases a lot of energy per unit mass.

Autoignition Temperature

  • The autoignition temperature is the lowest temperature at which a combustible substance catches fire without an external ignition source.

Types of Combustion

  • Explosive combustion involves a sudden increase in volume and release of gas, often resulting in a loud noise and a shockwave.

Flame Structure

  • A flame consists of three different zones: the inner flame (where combustion takes place), the luminous zone (where soot particles emit light), and the outer flame (where combustion is incomplete).

Fire Extinguishing Agents

  • Electrical equipment or oil fires can be controlled using a non-conductive extinguishing agent, such as carbon dioxide or dry powder.

Fuel Efficiency

  • Fuel efficiency is typically expressed in units of miles per gallon (mpg) or kilometers per liter (km/L).

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Description

Test your knowledge on combustion and flame with this quiz. Learn about the process of burning, the requirements for combustion, and the characteristics of flames.

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