# Interesting Trivia: Heating And Air Conditioning Service! Quiz

Approved & Edited by ProProfs Editorial Team
The editorial team at ProProfs Quizzes consists of a select group of subject experts, trivia writers, and quiz masters who have authored over 10,000 quizzes taken by more than 100 million users. This team includes our in-house seasoned quiz moderators and subject matter experts. Our editorial experts, spread across the world, are rigorously trained using our comprehensive guidelines to ensure that you receive the highest quality quizzes.
| By Ozzzmann
O
Ozzzmann
Community Contributor
Quizzes Created: 9 | Total Attempts: 14,098
Questions: 17 | Attempts: 1,022

Settings

With the hanging seasons it is important to keep warm in the winter and get some cool air for the summer. This therefore places some importance on understanding how to fit in heating and air conditioning equipment for buildings. Take up the true or false test below and get to see how much you know about these services and what is needed to have a proper functioning one. All the best!

• 1.

### A manifold gauge set can be used during the evacuation of the A/C system.

• A.

True

• B.

False

A. True
Explanation
A manifold gauge set is a tool used to measure the pressure and temperature of the refrigerant in an air conditioning system. During the evacuation process, the manifold gauge set is connected to the A/C system to monitor the pressure levels and ensure that the system is being properly evacuated. This is important because a proper evacuation removes any air or moisture from the system, which can cause damage or reduce the efficiency of the A/C system. Therefore, using a manifold gauge set during the evacuation process is necessary to ensure the A/C system is properly evacuated.

Rate this question:

• 2.

### A manifold gauge set can be used during A/C system diagnosis.

• A.

True

• B.

False

A. True
Explanation
A manifold gauge set is a tool used to measure and monitor pressure in an air conditioning system. It consists of multiple gauges that provide readings for both high and low pressure sides of the system. By connecting the gauge set to the A/C system, technicians can diagnose issues such as low refrigerant levels, blockages, or compressor problems. The readings obtained from the gauge set help in determining the overall health and performance of the system, making it an essential tool for A/C system diagnosis.

Rate this question:

• 3.

### Refrigerant condenses quickly when exposed to the atmosphere.

• A.

True

• B.

False

B. False
Explanation
Refrigerant does not condense quickly when exposed to the atmosphere. In fact, refrigerant is designed to remain in a gaseous state at normal atmospheric conditions. It only condenses when it is inside a closed system and subjected to low temperatures and high pressure.

Rate this question:

• 4.

### A manifold gauge set is used to determine both high-side and low-side pressures in the refrigeration system.

• A.

True

• B.

False

A. True
Explanation
A manifold gauge set is a tool that is commonly used by HVAC technicians to measure both the high-side and low-side pressures in a refrigeration system. This allows them to assess the performance and efficiency of the system, as well as diagnose any potential issues. By connecting the gauge set to the system, the technician can obtain accurate readings of the pressure levels on both sides, providing valuable information for troubleshooting and maintenance purposes. Therefore, the statement that a manifold gauge set is used to determine both high-side and low-side pressures in the refrigeration system is true.

Rate this question:

• 5.

### Warm underhood temperatures produce lower than normal A/C system pressures.

• A.

True

• B.

False

B. False
Explanation
Warm underhood temperatures do not produce lower than normal A/C system pressures. In fact, warm temperatures typically lead to higher A/C system pressures. This is because the refrigerant in the A/C system expands and becomes more pressurized when exposed to heat. Therefore, the correct answer is False.

Rate this question:

• 6.

### A single drop of water in an A/C refrigeration sytsem may cause damage to the system.

• A.

True

• B.

False

A. True
Explanation
Water in an A/C refrigeration system can cause damage because water can freeze and block the flow of refrigerant, leading to system malfunction. Additionally, water can cause corrosion and rusting of metal components, which can further impair the system's functionality. Therefore, even a single drop of water in the system can potentially cause significant damage.

Rate this question:

• 7.

### Refrigerant is lighter than oxygen.

• A.

True

• B.

False

B. False
Explanation
Refrigerant is not necessarily lighter than oxygen. The density of a refrigerant can vary depending on its specific composition and properties. While some refrigerants may be lighter than oxygen, others may be heavier or have similar densities. Therefore, it cannot be generalized that all refrigerants are lighter than oxygen, making the statement false.

Rate this question:

• 8.

### R-12 is stored in light blue containers.

• A.

True

• B.

False

B. False
Explanation
The given statement is false because R-12 is not stored in light blue containers.

Rate this question:

• 9.

### R-134a is stored in yellow containers.

• A.

True

• B.

False

B. False
Explanation
The given statement is false because R-134a, a type of refrigerant, is typically stored in containers that are color-coded as light blue, not yellow. The color coding helps to easily identify the type of refrigerant contained in the containers and ensures proper handling and usage.

Rate this question:

• 10.

### Which of the following statements best defines the term 'evacuation'?

• A.

Evacuation is a process in which refrigerant in the system is released.

• B.

Evacuation is a condition that exists when a compressor runs until there is no refrigerant left in the system.

• C.

Evacuation is a process that removes all traces of air, moisture, and refrigerant from the system.

• D.

Evacuation is a process that uses air to force moisture and dirt out of the system.

C. Evacuation is a process that removes all traces of air, moisture, and refrigerant from the system.
Explanation
Evacuation is a process that removes all traces of air, moisture, and refrigerant from the system. This definition accurately describes the purpose and outcome of an evacuation process. It emphasizes the removal of not only air and moisture but also refrigerant, which is crucial for maintaining the efficiency and performance of the system. By eliminating these elements, the system can operate effectively and prevent any potential damage or malfunctions.

Rate this question:

• 11.

### Which of the following statements is not true about orifice tube systems?

• A.

The suction line must be cool to the touch from the evaporator outlet to the compressor.

• B.

The liquid line from the condenser outlet to the orifice tube should be cool.

• C.

The evaporator should feel very cold.

• D.

The accumulator must be cool to the touch.

B. The liquid line from the condenser outlet to the orifice tube should be cool.
Explanation
The correct answer is that the liquid line from the condenser outlet to the orifice tube should be cool. In an orifice tube system, the liquid line carries refrigerant in its liquid state from the condenser to the orifice tube. The purpose of the orifice tube is to regulate the flow of refrigerant into the evaporator. The liquid line should actually be warm, as it carries high-pressure, high-temperature refrigerant from the condenser to the orifice tube. Once the refrigerant passes through the orifice tube, it undergoes a pressure drop and becomes a cool, low-pressure liquid, which then enters the evaporator.

Rate this question:

• 12.

### Which of the following cannot cause excessive heat?

• A.

A loose or damaged control cable

• B.

A heater control valve stuck open

• C.

A water flow control valve not opening fully

• D.

A faulty thermostatic fan

C. A water flow control valve not opening fully
Explanation
A water flow control valve not opening fully cannot cause excessive heat because if the valve is not opening fully, it means that the flow of water is restricted or limited. This would result in less water reaching the heater or radiator, causing a decrease in heat rather than excessive heat.

Rate this question:

• 13.

### To charge an air conditioning system while it is running, the refrigerant should be added to the:

• A.

High side

• B.

Low side

• C.

Both A and B

• D.

Neither A nor B

B. Low side
Explanation
To charge an air conditioning system while it is running, the refrigerant should be added to the low side. The low side of the system is where the refrigerant enters the compressor, which then compresses and sends it to the high side. Adding refrigerant to the low side ensures that it is properly circulated through the system and can effectively cool the air. Adding refrigerant to the high side could cause damage to the system and is not recommended. Therefore, the correct answer is the low side.

Rate this question:

• 14.

### R-12 refrigerant exposed to an open flame will produce:

• A.

Hydrogen gas

• B.

Hydrofluorocarbon gas

• C.

Hydrochloric gas

• D.

Phosgene gas

D. Phosgene gas
Explanation
When R-12 refrigerant is exposed to an open flame, it will produce phosgene gas. Phosgene gas is a highly toxic substance that was used as a chemical weapon during World War I. It is formed when chlorofluorocarbons (CFCs) are exposed to high temperatures, such as those produced by an open flame. Inhaling phosgene gas can cause severe respiratory distress and even death. Therefore, it is important to handle refrigerants like R-12 with caution and avoid exposing them to flames or high temperatures.

Rate this question:

• 15.

### R-12 and R-134a:

• A.

Should never be mixed

• B.

May be mixed after a system has been converted from R-12 to R-134a

• C.

Use the manifold gauge sets

• D.

All of the above

A. Should never be mixed
Explanation
R-12 and R-134a should never be mixed because they are different types of refrigerants with different chemical properties. Mixing them can lead to system damage, reduced cooling efficiency, and potential safety hazards. It is important to use the correct refrigerant for a specific system and not mix different types.

Rate this question:

• 16.

### EPA certification is required to:

• A.

Service R-12 A/C systems

• B.

Purchase R-12

• C.

Both A and B

• D.

Neither A nor B

C. Both A and B
Explanation
EPA certification is required to both service R-12 A/C systems and purchase R-12. This means that individuals must have the necessary certification in order to perform maintenance or repairs on R-12 A/C systems and also to buy R-12 refrigerant. The certification ensures that individuals have the knowledge and skills necessary to handle these tasks safely and in compliance with environmental regulations.

Rate this question:

• 17.

### Technician A says evacuating (pumping down) an air conditioning system removes air and moisture from the system. Tcehnician B says evacuating (pumping down) an air conditioning sytem removes dirt particles from the system. Who is correct?

• A.

A only

• B.

B only

• C.

Both A and B

• D.

Neither A nor B

A. A only
Explanation
Evacuating an air conditioning system involves removing air and moisture from the system. This process is typically done using a vacuum pump, which creates a vacuum and pulls out any air and moisture present in the system. However, evacuating the system does not remove dirt particles. Therefore, Technician A is correct in stating that evacuating an air conditioning system removes air and moisture, while Technician B is incorrect in claiming that it also removes dirt particles.

Rate this question:

Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

• Current Version
• Mar 21, 2023
Quiz Edited by
ProProfs Editorial Team
• May 09, 2009
Quiz Created by
Ozzzmann

Related Topics