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100+ Free RSES CMS Commercial Refrigeration Practice Questions

RSES Certificate Member Specialist (CMS) - Commercial Refrigeration practice questions are available now; exam metadata is being verified.

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2026 Statistics

Key Facts: RSES CMS Commercial Refrigeration Exam

100

Practice Questions

OpenExamPrep

80%

Passing Score

RSES

CM required

Prerequisite

RSES

Specialist

CMS Credential

RSES

8

CMS Specialty Categories

RSES

Multiple choice

Exam Format

RSES

The RSES CMS - Commercial Refrigeration exam is one of the Refrigeration Service Engineers Society's Certificate Member Specialist (CMS) examinations. It is a proctored, multiple-choice exam requiring 80% to pass, and candidates must already hold Certificate Member (CM) status before sitting any specialist exam. Content focuses on commercial refrigeration - high/medium/low-temperature systems and loads, multiplexed parallel compressor racks, refrigerant management and oil-return piping, compressors and condensers, evaporators and defrost methods, EPR and CPR valves, and system charging, superheat/subcooling and troubleshooting. RSES sets the exact question count and exam fee, which varies by member status. This free prep includes 100 research-based practice questions with explanations and an AI tutor.

Sample RSES CMS Commercial Refrigeration Practice Questions

Try these sample questions to test your RSES CMS Commercial Refrigeration exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In commercial refrigeration, a system is generally classified as 'low-temperature' when the refrigerated box is held at approximately which temperature range?
A.35 F to 45 F
B.28 F to 34 F
C.-10 F to 0 F
D.50 F to 60 F
Explanation: Low-temperature commercial refrigeration covers frozen-food and ice-cream storage with box temperatures near -10 F to 0 F, requiring saturated suction temperatures well below 0 F. Medium-temperature systems hold roughly 28 F to 45 F for fresh meat, produce, and dairy.
2A walk-in cooler holding fresh produce at 35 F uses an evaporator with a 10 F TD. What is the approximate saturated suction (evaporating) temperature?
A.45 F
B.25 F
C.35 F
D.10 F
Explanation: Evaporator TD is the difference between box air temperature and the refrigerant's saturated evaporating temperature. With a 35 F box and a 10 F TD, the coil evaporates at 35 - 10 = 25 F. A 10 F TD is typical for medium-temp coils to maintain higher relative humidity.
3A high evaporator TD (for example 20 F or more) on a cooler coil most directly causes which undesirable effect on the stored product?
A.Excessive humidity and condensation on product
B.Low coil capacity and short cycling
C.Product dehydration from low box humidity
D.Higher suction pressure than design
Explanation: A large TD means a very cold coil relative to the box, which condenses and freezes more moisture out of the air, lowering relative humidity and drying out unpackaged product. Medium-temp coolers for produce use a low TD (8-12 F) to keep humidity high; freezers tolerate higher TDs.
4When sizing a condensing unit, the refrigeration 'product load' refers primarily to the heat removed to:
A.Operate the evaporator fan motors
B.Cool and freeze the product to storage temperature
C.Overcome heat gain through the walls
D.Defrost the evaporator coil
Explanation: Product load is the sensible and (for freezers) latent heat removed to bring incoming product down to and hold it at storage temperature, including pull-down. Total box load also includes transmission (wall) load, infiltration, and internal loads such as fans, lights, and people.
5Most commercial refrigeration condensing units are sized to run for what approximate maximum percentage of a 24-hour day to allow for defrost and load swings?
A.50%
B.100%
C.Up to about 16 to 18 hours (roughly 70%)
D.Less than 4 hours
Explanation: Equipment is commonly sized for an 18-hour (or about 16-hour for low-temp) running time per day so that the unit has reserve capacity and idle time for defrost and to recover from door openings or product loading. Loads are often divided by a running-time factor (e.g., 18/24) to find required hourly capacity.
6A self-contained reach-in refrigerator differs from a remote (split) commercial system in that the self-contained unit:
A.Has the condensing unit mounted on or in the cabinet
B.Always uses a flooded evaporator
C.Cannot use a TXV
D.Requires a separate machine room
Explanation: A self-contained unit packages the compressor, condenser, and evaporator together in or on the cabinet, with no field refrigerant piping. Remote systems locate the condensing unit away from the fixture (rooftop or machine room) and connect with field-run refrigerant lines.
7In a typical supermarket, medium-temperature display cases (meat, dairy, produce) are most commonly served by which arrangement?
A.Individual self-contained condensing units at each case
B.A parallel (multiplexed) compressor rack in a machine room
C.A single residential split system
D.Absorption chillers
Explanation: Supermarkets group many cases of similar temperature onto a parallel compressor rack in a machine room, sharing a common suction manifold and remote condenser. This centralizes maintenance, improves efficiency through staging, and uses a single large charge with distributed evaporators.
8The transmission (wall) load for a walk-in box is calculated primarily from the wall area, the temperature difference across the wall, and the:
A.Refrigerant type
B.Insulation U-factor (or R-value)
C.Compressor displacement
D.Evaporator fan horsepower
Explanation: Transmission load = U x A x TD, where U is the overall heat-transfer coefficient of the panel (reciprocal of R-value), A is the surface area, and TD is the inside-to-outside temperature difference. Better insulation (higher R, lower U) reduces this conductive heat gain.
9An air curtain (air screen) across a walk-in cooler or open display case door primarily reduces which component of the box load?
A.Product load
B.Transmission load
C.Infiltration load
D.Defrost load
Explanation: An air curtain creates a moving air barrier that limits the exchange of warm, humid room air with the cold box, directly reducing the infiltration load from door openings or the open face of a display case. This also reduces coil frosting and humidity gain.
10Which internal load is typically ADDED to a freezer box calculation but is essentially absent in a cooler?
A.Evaporator fan heat
B.Door-heater and frost-control heat
C.Lighting heat
D.Occupant heat
Explanation: Freezers require door frame, gasket, and frost-control (anti-sweat) heaters and electric defrost that add heat the system must later remove, a load largely absent in above-freezing coolers. Fan, lighting, and occupant loads apply to both box types.

About the RSES CMS Commercial Refrigeration Practice Questions

Verified exam format metadata for RSES Certificate Member Specialist (CMS) - Commercial Refrigeration is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.