CHS universal1

Never fill a refillable refrigerant cylinder beyond ________.

• A) 70% of its capacity by weight

• B) 70% of its capacity by volume

• C) 80% of its capacity by weight

• C) 80% of its capacity by volume

What makes HFC refrigerants damaging to the environment?

• A) They contain fluorine, which damages the ozone layer.

• B) They contain chlorine, which damages the ozone layer.

• C) They have a high ozone depletion potential (ODP).

• D) They can have very high global warming potentials.

When transferring liquid in service hoses, you should guard against trapping ________.

• A) oil in the service hose

• B) oil in the manifold gauge set

• C) liquid refrigerant in the service hose between closed service valves

• D) refrigerant vapor in the service hoses between closed service valves

When a system using POE oil has been opened, what is the minimum evacuation level that should be achieved and held before charging the system?

• A) 28 in Hg

• B) 2000 microns

• C) 500 microns

• D) 500 in Hg

The Montreal Protocol is ________.

• A) An international treaty that addresses ozone-depleting substances and their alternatives

• B) A test procedure or protocol to use when measuring GWP

• C) A test procedure or protocol to use when measuring ODP

• D) An international treaty that certified technicians and recovery equipment

________ make(s) HFO refrigerants less flammable than HC refrigerants.

• A) Chlorine

• B) Fhosgene

• C) Fluorine

• D) Fractured oxygen (FO)

Before shipping any recovered refrigerant, you must ________.

• A) properly label the refrigerant container

• B) fill the cylinder to capacity

• C) verify the recipient is Section 608 certified to reclaim refrigerant

• D) check the pressure of the refrigerant

When a system is operating, the ________ changes a low-pressure vapor to a high-pressure vapor.

• A) expansion valve

• B) evaporator

• C) accumulator

• D) compressor

A "self-contained" recovery device ________.

• A) cannot be used anymore

• B) removes refrigerant with the assistance of components in the appliance

• C) must have the recovery tank inside the recovery unit

• D) can only be used on a system with 5 pounds or less of refrigerant

A flammable refrigerant can only burn or explode if the refrigerant concentration is ________.

• A) above the lower flammability limit

• B) below the upper flammability limit

• C) either below the lower flammability limit or above the upper flammability limit

• D) both above the lower flammability limit and below the upper flammability limit