Gas Types and Properties: A Comprehensive Guide for Plumbing Professionals

Question 1

Which gas is non-flammable and commonly used in plumbing systems?

Accepted Answer

Nitrogen

Answer

Propane

Answer

Acetylene

Answer

Oxygen

Question 2

What is the chemical formula for natural gas?

Accepted Answer

CH4

Answer

C2H6

Answer

C3H8

Answer

C4H10

Question 3

What is the approximate specific gravity of propane?

Accepted Answer

0.5

Answer

1.0

Answer

1.5

Answer

2.0

Question 4

Which gas is commonly used in welding and cutting applications?

Accepted Answer

Acetylene

Answer

Oxygen

Answer

Nitrogen

Answer

Carbon dioxide

Question 5

Which of the following gases is flammable?

Accepted Answer

Methane

Answer

Nitrogen

Answer

Helium

Answer

Carbon dioxide

Question 6

What type of fitting is used to connect a gas line to a copper pipe in a compression-type connection?

Accepted Answer

Compression fitting

Answer

Flare fitting

Answer

Soldered fitting

Answer

Threaded fitting

Question 7

What is the primary function of a gas pressure regulator?

Accepted Answer

To maintain a consistent gas pressure

Answer

To prevent gas leaks

Answer

To measure gas flow

Answer

To ignite gas appliances

Question 8

Which gas is NOT commonly used in plumbing systems?

Accepted Answer

Oxygen

Answer

Natural gas

Answer

Propane

Answer

Butane

Question 9

Which characteristic of natural gas makes it suitable as a fuel?

Accepted Answer

High flammability

Answer

Low density

Answer

Non-toxic nature

Answer

Sweet odor

Question 10

What is the main safety concern when handling propane?

Accepted Answer

Explosion

Answer

Asphyxiation

Answer

Chemical burns

Answer

Electrical shock

Question 11

What is the function of a pressure regulator in a gas system?

Accepted Answer

Reduce gas pressure

Answer

Control gas flow

Answer

Prevent backflow

Answer

Act as a safety valve

Question 12

What is the primary purpose of a gas meter in a plumbing system?

Accepted Answer

Measuring gas consumption

Answer

Regulating gas flow

Answer

Preventing gas leaks

Answer

Providing ventilation

Question 13

Which of the following properties is NOT characteristic of natural gas?

Accepted Answer

Toxic

Answer

Colorless

Answer

Odorless

Answer

Flammable

Question 14

What is the chemical formula for propane?

Accepted Answer

C₃H₈

Answer

CH₄

Answer

C₂H₆

Answer

C₄H₁₀

Question 15

Which type of gas is commonly used in refrigeration and air conditioning systems?

Accepted Answer

Refrigerant

Answer

Natural gas

Answer

Propane

Answer

Acetylene

Question 16

What is the primary hazard associated with working with acetylene gas?

Accepted Answer

Explosion

Answer

Fire

Answer

Asphyxiation

Answer

Corrosion

Question 17

Which of the following is a combustible gas?

Accepted Answer

Carbon monoxide

Answer

Oxygen

Answer

Nitrogen

Answer

Helium

Question 18

What is the primary function of a gas pressure regulator?

Accepted Answer

To decrease the pressure of the gas

Answer

To increase the pressure of the gas

Answer

To measure the pressure of the gas

Answer

To control the flow of gas

Question 19

In plumbing systems, how is compressed air commonly used to detect leaks?

Accepted Answer

Compressed air is introduced into the system, and leaks are identified by the escaping air.

Answer

Compressed air is never used in plumbing systems for leak detection.

Answer

Compressed air is used to propel water through the system, and leaks are detected by a drop in water pressure.

Question 20

Which combustible gas is commonly used in plumbing systems?

Accepted Answer

Propane

Answer

Oxygen

Answer

Carbon dioxide

Answer

Nitrogen

Question 21

What is the primary component of natural gas, commonly used in homes?

Accepted Answer

Methane

Answer

Ethane

Answer

Propane

Answer

Butane

Question 22

When working with combustible gases, what is the primary safety concern?

Accepted Answer

Explosion hazard

Answer

Fire hazard

Answer

Asphyxiation hazard

Answer

Chemical burns

Question 23

Which type of gas detector is specifically designed to detect the presence of flammable gases?

Accepted Answer

Flammable gas detector

Answer

Smoke detector

Answer

Carbon monoxide detector

Answer

Heat detector

Question 24

Which material is commonly used for gas piping due to its flexibility and resistance to corrosion?

Accepted Answer

Polyethylene

Answer

Copper

Answer

Iron

Answer

Aluminum

Question 25

When installing a gas appliance, what is the proper sequence of steps to ensure safety?

Accepted Answer

Install the appliance according to the manufacturer's instructions.

Answer

Connect the gas line first, then turn on the gas.

Answer

Turn on the gas first, then connect the gas line.

Answer

Call a licensed plumber to perform the installation.

Question 26

What is the primary constituent of natural gas?

Accepted Answer

Methane

Answer

Ethane

Answer

Propane

Answer

Butane

Question 27

Which of the following is a gas used as a refrigerant?

Accepted Answer

R-410A

Answer

Propane

Answer

Natural gas

Answer

Butane

Question 28

Identify the property that is NOT associated with natural gas:

Accepted Answer

Non-flammable

Answer

Colorless

Answer

Odorless

Answer

Toxic

Question 29

Which component constitutes the majority of propane gas?

Accepted Answer

Propane

Answer

Methane

Answer

Ethane

Answer

Butane

Question 30

What is the primary function of a gas regulator?

Accepted Answer

To regulate the flow of gas

Answer

To prevent gas leaks

Answer

To detect gas leaks

Answer

To measure gas pressure

Question 31

What is the primary purpose of a gas meter in a plumbing system?

Accepted Answer

To measure gas consumption

Answer

To regulate gas pressure

Answer

To detect gas leaks

Answer

To filter impurities from gas

Question 32

Name the primary component of natural gas.

Accepted Answer

Methane

Answer

Ethane

Answer

Butane

Answer

Propane

Question 33

Identify the gas that is denser than air.

Accepted Answer

Carbon dioxide

Answer

Hydrogen

Answer

Helium

Answer

Nitrogen

Question 34

What differentiates LP gas from natural gas?

Accepted Answer

LP gas is liquefied, while natural gas is not.

Answer

Natural gas is liquefied, while LP gas is not.

Answer

LP gas has a higher calorific value than natural gas.

Answer

Natural gas has a higher calorific value than LP gas.

Question 35

What is the primary purpose of a gas meter?

Accepted Answer

Measure the consumed gas volume.

Answer

Regulate gas pressure.

Answer

Prevent gas leaks.

Answer

Detect gas leaks.

Question 36

In plumbing systems, how does pressure regulation ensure the safe and efficient distribution of gas?

Accepted Answer

By controlling gas flow rates, pressure regulation prevents excessive pressure buildup, protecting pipes and appliances from damage.

Answer

Pressure regulation is not necessary in plumbing systems because gases naturally flow based on their density.

Answer

Pressure regulation is only applicable to liquid systems and not to gas plumbing systems.

Answer

Pressure regulation is solely used to increase gas flow rates, with no impact on safety.

Question 37

In plumbing systems, which safety measure is crucial when handling natural gas?

Accepted Answer

Using a gas leak detector

Answer

Closing windows and doors

Answer

Smoking while working

Answer

Ignoring gas odors

Question 38

Which gas listed below is considered combustible and frequently used for residential heating and cooking?

Accepted Answer

Natural gas

Answer

Helium

Answer

Nitrogen

Answer

Oxygen

Question 39

Which type of gas is primarily employed in the welding and cutting industry due to its high-temperature flame?

Accepted Answer

Acetylene

Answer

Propane

Answer

Methane

Answer

Butane

Question 40

Which gas among the options provided is denser than air, meaning it has a higher mass per unit volume compared to air?

Accepted Answer

Butane

Answer

Oxygen

Answer

Helium

Answer

Hydrogen

Question 41

Natural gas, a widely used energy source, primarily consists of which component?

Accepted Answer

Methane

Answer

Butane

Answer

Ethane

Answer

Propane

Question 42

In air conditioning systems, which gas is commonly utilized as a refrigerant due to its ability to absorb and release heat?

Accepted Answer

Freon

Answer

Oxygen

Answer

Helium

Answer

Nitrogen

Question 43

Among the gases listed below, which one is characterized by being colorless, odorless, and tasteless?

Accepted Answer

Nitrogen

Answer

Carbon dioxide

Answer

Oxygen

Answer

Propane

Question 44

When working with carbon monoxide, which of the following health hazards is a primary concern?

Accepted Answer

Asphyxiation, which can result from the displacement of oxygen by carbon monoxide in the bloodstream

Answer

Eye irritation, caused by direct contact with carbon monoxide

Answer

Skin burns, a potential effect of exposure to high concentrations of carbon monoxide

Answer

Nausea, a common symptom of carbon monoxide poisoning

Question 45

Which of the following is NOT a type of fuel gas commonly used in plumbing systems?

Accepted Answer

Acetylene

Answer

Propane

Answer

Natural gas

Answer

Butane

Question 46

Which of the following gases has the highest heating value?

Accepted Answer

Acetylene

Answer

Propane

Answer

Butane

Question 47

Which gas is toxic and can cause asphyxiation?

Accepted Answer

Carbon monoxide

Answer

Helium

Answer

Propane

Answer

Butane

Question 48

What is the primary component of natural gas?

Accepted Answer

Methane

Answer

Butane

Answer

Propane

Answer

Ethane

Question 49

What gas is commonly used as a refrigerant in air conditioning systems?

Accepted Answer

Chlorofluorocarbon (CFC)

Answer

Butane

Answer

Propane

Question 50

What term describes the ability of a gas to flow and expand to fill its container?

Accepted Answer

Fluidity

Answer

Density

Answer

Viscosity

Answer

Flammability

Question 51

What characteristic odor is added to natural gas for safety purposes?

Accepted Answer

Mercaptan

Answer

Butane

Answer

Ethane

Question 52

What type of gas is often used to fill balloons and party decorations?

Accepted Answer

Helium

Answer

Propane

Answer

Natural gas

Answer

Butane