RSES Refrigeration Fundamentals & System Components 2

Question 1

What is the primary function of a thermostatic expansion valve (TXV) in a refrigeration system?

Accepted Answer

Meter refrigerant flow to maintain superheat at the evaporator outlet

Answer

A TXV meters refrigerant flow into the evaporator to maintain a set superheat, preventing liquid slugging at the compressor.

Question 2

Which refrigerant property is measured by a gauge manifold's high-side gauge during normal operation?

Accepted Answer

Condenser saturation pressure

Answer

The high-side gauge reads the discharge pressure, which corresponds to the condenser saturation pressure.

Question 3

Subcooling in a refrigeration system refers to cooling the liquid refrigerant:

Accepted Answer

Below its condensing temperature

Answer

Subcooling lowers liquid refrigerant temperature below its saturation point, preventing flash gas before the expansion device.

Question 4

A filter-drier in a refrigeration system is primarily installed to:

Accepted Answer

Remove moisture and contaminants from the refrigerant

Answer

Filter-driers adsorb moisture and trap particulates to protect the expansion device and compressor from damage.

Question 5

The suction line accumulator is designed to protect the compressor from:

Accepted Answer

Liquid refrigerant slugging

Answer

An accumulator collects liquid refrigerant and oil before the compressor inlet, releasing only vapor to prevent hydraulic damage.

(RSES) Refrigeration Service Engineers Society Certification Practice Test