RSES Safety Procedures 2

Question 1

When using a manifold gauge set on a refrigeration system, what is the correct procedure before connecting to the system?

Accepted Answer

Purge the gauge hoses with refrigerant to remove air and moisture

Answer

Purging gauge hoses removes air and moisture that could contaminate the refrigerant system or give inaccurate readings.

Question 2

What is the minimum recommended safety relief valve setting for a high-pressure refrigerant system using R-22?

Accepted Answer

350 psig

Answer

ASHRAE and safety codes require relief valves on R-22 high-side equipment to be set at no more than the maximum allowable working pressure, typically 350 psig for R-22 high-side components.

Question 3

A technician discovers refrigerant oil on the floor near a refrigeration unit. What is the FIRST safety action to take?

Accepted Answer

Identify and eliminate any ignition sources in the area

Answer

Oil on the floor near refrigeration equipment can create slip hazards and may contain refrigerant; eliminating ignition sources is the first priority if flammable refrigerants are involved.

Question 4

Which color-coded cylinder should NEVER be refilled and is intended for single use only?

Accepted Answer

Disposable small cylinders with a non-refillable valve

Answer

Disposable refrigerant cylinders are designed for single use and are illegal to refill; they are identified by their non-refillable valves.

Question 5

What does a pressure-enthalpy diagram primarily help a refrigeration technician determine regarding safety?

Accepted Answer

Whether system pressures are within safe operating limits for the refrigerant

Answer

A pressure-enthalpy diagram shows saturation curves and operating conditions, helping technicians verify that system pressures stay within safe limits for the specific refrigerant.

(RSES) Refrigeration Service Engineers Society Certification Practice Test

(RSES) Refrigeration Service Engineers Society Certification Practice Test

RSES Safety Procedures 2