CRST Safety Procedures & Environmental Regulations 4

Question 1

What is the primary purpose of the Montreal Protocol as it relates to refrigeration technicians?

Accepted Answer

Phase out ozone-depleting substances globally

Answer

The Montreal Protocol is an international treaty that established schedules for phasing out ozone-depleting substances, including CFC and HCFC refrigerants.

Question 2

When should a technician use a self-contained breathing apparatus (SCBA) rather than a supplied-air respirator during refrigerant work?

Accepted Answer

In immediately dangerous to life or health (IDLH) atmospheres

Answer

SCBA is required in IDLH atmospheres where immediate danger exists, as it provides a self-contained air supply independent of the surrounding environment.

Question 3

Which type of fire extinguisher is appropriate for an electrical fire involving a refrigeration control panel?

Accepted Answer

Class C (CO2 or dry chemical)

Answer

Class C extinguishers are rated for electrical fires and use non-conductive agents like CO2 or dry chemical that won't create electrocution hazards.

Question 4

What is the correct procedure for disposing of a refrigerant cylinder that has been emptied to EPA standards?

Accepted Answer

Return it to the refrigerant supplier for reuse or disposal

Answer

Empty cylinders should be returned to the supplier, as they may contain residual refrigerant and are subject to DOT regulations even when emptied.

Question 5

A technician discovers an unknown refrigerant in a system. Why is mixing it with a known refrigerant in a recovery cylinder prohibited?

Accepted Answer

Mixed refrigerants cannot be reclaimed and must be destroyed

Answer

Reclaimers cannot process contaminated or mixed refrigerants, so blended unknown refrigerants must be destroyed rather than reclaimed.

(CRST) Certified Refrigeration Service Technician Practice Test

(CRST) Certified Refrigeration Service Technician Practice Test

CRST Safety Procedures & Environmental Regulations 4