EPA Practice Test – Core #10

What percentage of ozone gas is contained over the earth’s surface in the stratospheric layer?

Asphyxia describes a lack of

 Since _______, it has been a violation, as per the EPA, to vent HFCs.

What kind of refrigerants will be used when virgin supplies of CFCs are depleted?

There is an increase in ground level ozone when there is a depletion of ozone in the stratosphere.

What happens to the quality of emissions potentialized by long hoses?

Which of the following devices is used in order to determine the general area of a leak?

Esters are the oils used in most R134a refrigeration systems.

The piping connection to the vacuum pump should be as short in length as possible

 If nitrogen is used to flush the debris out of the system, it may not be legally vented after recovering the refrigerant.

Refrigerants can displace oxygen and lead to suffocation (when displacing large quantities).

The system should be isolated when measuring a system’s vacuum.

How many ports do recovery cylinders have?

Chlorine added to the air by erupting volcanoes contributes to less pollution than CFCs because it dissolves with water and comes down with rain.

______ in the upper stratosphere indicates that the ozone layer is being destroyed.

An explosion may occur when oxygen or compressed air are mixed with refrigerants.

The same recovery tank must not contain different refrigerants

 Which of the following cylinders are used only with a virgin refrigerant?

During recovery, refrigerant cylinders may be heated with an open flame during recovery.

The diameter of the piping connection to the vacuum pump should be as large as possible.

The vacuum pump should be connected as far as possible from the system vacuum gauge.

Appliances with 15 pounds or less of refrigerant use what kind of recovery equipment?

What is the process that ensures the reuse of refrigerants by separating the oil from the refrigerant and removing moisture from the refrigerant by passing it through one or more of the filter dryers?

 Venting refrigerants was formally banned with the creation of the Clean Air Act

What is one possible result of the inhalation of refrigerant vapors or mist?