Question 1

Which refrigerant is used in most truck air conditioning systems?

Accepted Answer

R134a is the refrigerant that is used in most truck air conditioning systems today. It is a more environmentally friendly refrigerant and is non-ozone depleting, making it the best choice. R-12 and R-22 are no longer used due to their negative impact on the environment, and R-502 is used in older systems that are being phased out.

Question 2

The ozone layer is located:

Accepted Answer

The ozone layer is located between 7 and 30 miles (11 to 48 km) above the earth's surface.

Question 3

Which of the following refrigerants do not contain chlorine?

Accepted Answer

R-404a is a hydrofluorocarbon (HFC) refrigerant, which does not contain chlorine. R-502, R-22, and R-12 are all chlorofluorocarbon (CFC) and/or hydrochlorofluorocarbon (HCFC) refrigerants that have been phased out due to their harmful effects on the ozone layer.

Question 4

What color of container would you expect to find R-134a in?

Accepted Answer

R-134a is a refrigerant used in air conditioning systems and is typically stored in light blue containers.

Question 5

What regulation prevents the release of ozone depleting substances?

Accepted Answer

The Clean Air Act regulates the release of ozone-depleting substances, as well as other air pollutants. It was first passed in the United States in 1963, and has been amended several times since then to increase its effectiveness in protecting public health and the environment.

Question 6

Which of the following should be adhered to when working with refrigerant?

Accepted Answer

All of the options presented should be adhered to when working with refrigerant. It is important to work in a well-ventilated area to avoid inhaling harmful vapors, never allow refrigerant vapors to come in contact with an open flame to avoid fire hazards, and transport refrigerant in a separate compartment, never in the passenger compartment of a vehicle.

Question 7

Before a disposable refrigerant cylinder can be disposed of it:

Accepted Answer

The disposable refrigerant cylinder must be completely emptied of refrigerant before disposal to prevent any environmental harm or danger. It is not necessary to clean, fill with compressed air, or flush with water before disposal.

Question 8

How often must a refillable refrigerant cylinder be tested?

Accepted Answer

According to the U.S. Environmental Protection Agency (EPA), refillable refrigerant cylinders must be tested every 5 years. It is important to follow these guidelines to ensure the safe handling and transporting of refrigerants.

Question 9

When working with refrigerant cylinders which of the following should not be done?

Accepted Answer

Never add a source of external heat to a refrigerant cylinder.

Question 10

Any person repairing or servicing motor vehicle air conditioning must be certified by:

Accepted Answer

The Environmental Protection Agency (EPA) requires that any person who repairs or services motor vehicle air conditioning systems must be certified under Section 609 of the Clean Air Act. This certification applies to anyone who performs maintenance, service, or repair on air conditioning systems in motor vehicles. The other options, DOT, Ministry of Transportation, and OSHA are not directly related to motor vehicle air conditioning certification.

Question 11

What year was the Montreal Protocol signed?

Accepted Answer

The Montreal Protocol was signed on September 16, 1987.

Question 12

The greenhouse effect:

Accepted Answer

The greenhouse effect is a process by which certain gases (including carbon dioxide) trap heat in the Earth's atmosphere and prevent it from radiating back into space. This causes the Earth's surface temperature to be higher than it would be otherwise. It is a naturally occurring process that helps to keep the Earth's temperature within a range that is suitable for life. However, human activities such as the burning of fossil fuels (which release large amounts of carbon dioxide into the atmosphere) have increased the concentration of these greenhouse gases, leading to an enhanced greenhouse effect and global warming. Therefore, all of the statements A, B, and C are correct.

Question 13

The health and environmental concerns caused by the breakdown of the ozone layer include:

Accepted Answer

The breakdown of the ozone layer can lead to an increase in skin cancers, suppression of the immune response system, and an increase in cataracts. These are all well-documented health and environmental concerns associated with the depletion of the ozone layer.

Question 14

If liquid refrigerant comes in contact with human tissue it:

Accepted Answer

Liquid refrigerant can cause freeze burns on contact with skin or cause blindness if it comes in contact with eyes. Therefore, it is crucial to flush the affected area with warm water for at least 15 minutes.

Question 15

Which of the following products in not contained in a CFC refrigerant?

Accepted Answer

CFC refrigerants contain chlorine, fluorine, and carbon but not hydrogen.

Quiz 2: Environmental and Safety Practices