RSES Refrigerant Management 3

Question 1

What is the primary purpose of adding a desiccant dryer to a refrigeration system?

Accepted Answer

To remove moisture from the refrigerant circuit

Answer

Desiccant dryers (filter-driers) absorb moisture from the refrigerant to prevent ice formation at the expansion device and acid formation in the system.

Question 2

Which refrigerant was the primary replacement for R-12 in automotive air conditioning systems?

Accepted Answer

R-134a

Answer

R-134a replaced R-12 in automotive AC systems beginning in 1994 model year vehicles because it has zero ozone depletion potential.

Question 3

Non-condensable gases trapped in a refrigeration system will cause which of the following symptoms?

Accepted Answer

Higher than normal discharge pressure

Answer

Non-condensable gases (such as air or nitrogen) accumulate in the condenser and raise the discharge pressure above what the refrigerant saturation pressure would be at the condenser temperature.

Question 4

Under the Montreal Protocol's Kigali Amendment, HFC refrigerants are being phased down primarily because of their contribution to which environmental problem?

Accepted Answer

Global warming / climate change

Answer

The Kigali Amendment targets HFCs due to their high global warming potential (GWP), as they do not deplete ozone but are potent greenhouse gases.

Question 5

A technician discovers that a system's refrigerant has been contaminated with the wrong type of refrigerant. What is the correct procedure?

Accepted Answer

Recover the entire charge and send to a reclaimer, then recharge with virgin refrigerant

Answer

Contaminated refrigerant must be fully recovered and sent to a certified reclamation facility; the system should then be recharged with verified virgin or reclaimed refrigerant.

(RSES) Refrigeration Service Engineers Society Certification Practice Test

(RSES) Refrigeration Service Engineers Society Certification Practice Test

RSES Refrigerant Management 3