213 ppt5 Plumbing Gases Quiz

Which gas is commonly used in plumbing for heating water?

• Butane

• Argon

• Helium

• Neon

Answer explanation

Butane is commonly used in plumbing for heating water due to its efficiency and high energy content. Other gases like argon, helium, and neon are not suitable for this purpose.

Which gas is commonly used in domestic properties for boiler and cooker fuel but is not hot enough for soldering?

• Butane

• Propane

• Natural gas

• Ethylene

Answer explanation

Natural gas is commonly used in homes for heating and cooking but burns at a lower temperature than butane or propane, making it unsuitable for soldering tasks.

Which gas is flammable and used for LPG gas in soldering?

• Natural gas

• Propane

• Butane

• Acetylene

Answer explanation

Propane is a flammable gas commonly used in LPG (liquefied petroleum gas) for soldering. It burns cleanly and efficiently, making it ideal for heating applications, unlike other options like natural gas or butane.

Which of the following is NOT a component of the fire triangle?

• Fuel

• Water

• Heat

• Oxygen

Answer explanation

The fire triangle consists of three essential components: fuel, heat, and oxygen. Water is not a component of the fire triangle; instead, it is used to extinguish fires by removing heat.

Which of the following is a necessary condition for combustion to occur?

• Absence of air

• Presence of water

• Presence of oxygen

• Absence of heat

Answer explanation

Combustion requires a fuel, heat, and a reactant, which is typically oxygen. Without oxygen, combustion cannot occur, making its presence a necessary condition for the process.

What is the calorific value of fuels related to?

• The color of the flame

• The amount of heat given off

• The speed of combustion

• The type of fuel

Answer explanation

The calorific value of fuels refers to the amount of heat given off during combustion. It measures the energy released, making 'the amount of heat given off' the correct choice.

Why does natural gas require a specific amount of oxygen to burn?

• To increase the flame size

• To ensure complete combustion

• To reduce the temperature

• To change the color of the flame

Answer explanation

Natural gas requires a specific amount of oxygen to ensure complete combustion. This process maximizes energy output and minimizes harmful emissions, making it essential for efficient burning.

What is the process called when steam turns back into a liquid?

• Condensation

• Evaporation

• Sublimation

• Freezing

Answer explanation

The process when steam turns back into a liquid is called condensation. This occurs when water vapor cools and loses energy, transforming back into liquid water.

What is a characteristic of refrigerants that makes them useful in cooling systems?

• High boiling point

• Low boiling point

• High freezing point

• High density

Answer explanation

Refrigerants with a low boiling point can easily evaporate at low temperatures, absorbing heat from the environment. This property makes them effective in cooling systems, allowing for efficient heat transfer.

What is the primary component of natural gas?

• Methane

• Ethane

• Propane

• Butane

Answer explanation

The primary component of natural gas is methane, which typically makes up about 70-90% of its composition. Ethane, propane, and butane are present in smaller amounts.