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100+ Free RSES CMS Heating Practice Questions

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2026 Statistics

Key Facts: RSES CMS Heating Exam

100

Practice Questions

OpenExamPrep

80%

Passing Score

RSES

Multiple choice

Exam Format

RSES

CM required

Prerequisite

RSES

Specialty

CMS Heating Designation

RSES

6 areas

Heating Content Domains

RSES

The RSES CMS — Heating exam is a Certificate Member Specialist (CMS) specialty exam from the Refrigeration Service Engineers Society for HVACR technicians who already hold the RSES Certificate Member (CM) designation. It is a multiple-choice exam requiring 80% to pass and concentrates on heating: gas, oil and electric heating systems, combustion and venting, heat exchangers, burners, ignition and flame-safety controls, NFPA 54 gas codes and safety, and heating sequence of operation and troubleshooting. RSES does not publish a fixed item count for each specialty exam. This free prep includes 100 research-based practice questions with explanations and an AI tutor.

Sample RSES CMS Heating Practice Questions

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

1Approximately how many BTU of heat does one cubic foot of natural gas contain?
A.100 BTU
B.1,000 BTU
C.2,500 BTU
D.3,412 BTU
Explanation: Natural gas has a heating value of roughly 1,000 BTU per cubic foot (commonly stated as 1,000-1,050 BTU/ft³). Technicians use this value to convert a gas meter clocking into furnace input rate.
2What is the typical manifold (burner) gas pressure for a residential natural-gas furnace?
A.0.5 in. w.c.
B.3.5 in. w.c.
C.11 in. w.c.
D.14 in. w.c.
Explanation: A natural-gas furnace is normally set to about 3.5 inches of water column at the manifold downstream of the gas valve regulator. Propane furnaces by contrast run about 10-11 in. w.c. manifold pressure.
3How many BTU per hour does 1 kilowatt of electric resistance heat produce?
A.1,000 BTU/hr
B.3,412 BTU/hr
C.12,000 BTU/hr
D.9,600 BTU/hr
Explanation: Each kilowatt of electric resistance heating converts to about 3,412 BTU/hr. A 10 kW electric furnace therefore produces roughly 34,120 BTU/hr of heat.
4Electric resistance heating elements are most commonly made of which material?
A.Copper
B.Nichrome (nickel-chromium)
C.Aluminum
D.Silver
Explanation: Electric furnace and strip-heat elements use nichrome (nickel-chromium) resistance wire because it has high resistivity and withstands high temperatures without oxidizing rapidly. The element glows and transfers heat to the airstream.
5In an electric furnace, what is the primary purpose of the sequencer?
A.To regulate gas flow to the burners
B.To energize multiple heating elements in stages rather than all at once
C.To sense flame and lock out on failure
D.To reverse the refrigerant flow
Explanation: A sequencer brings heating elements on (and off) in timed stages to limit inrush current and reduce demand spikes on the electrical service. It also typically delays the blower slightly so air is warm when it discharges.
6A 240-volt electric heating element draws 20 amps. What is its power output in watts?
A.260 watts
B.4,800 watts
C.12 watts
D.480 watts
Explanation: Power equals volts times amps: 240 V × 20 A = 4,800 watts (4.8 kW). At 3,412 BTU/kW that is about 16,380 BTU/hr of heat output.
7What is the approximate heating value of propane (LP gas)?
A.1,000 BTU/ft³
B.2,500 BTU/ft³
C.500 BTU/ft³
D.3,412 BTU/ft³
Explanation: Propane contains about 2,500 BTU per cubic foot, roughly 2.5 times the heating value of natural gas. Because it is denser and richer, propane appliances use smaller burner orifices and higher manifold pressure.
8The specific gravity of natural gas relative to air is approximately:
A.0.6
B.1.0
C.1.5
D.2.0
Explanation: Natural gas (mostly methane) has a specific gravity of about 0.6, meaning it is lighter than air (air = 1.0) and tends to rise and disperse upward when it leaks. Propane, by contrast, has a specific gravity around 1.5 and sinks.
9Which fuel oil grade is most commonly burned in residential oil-fired heating equipment?
A.No. 1 fuel oil
B.No. 2 fuel oil
C.No. 4 fuel oil
D.No. 6 (Bunker C) fuel oil
Explanation: No. 2 fuel oil is the standard fuel for residential oil burners. It has about 140,000 BTU per gallon and flows readily at normal temperatures without preheating.
10Approximately how many BTU does one gallon of No. 2 fuel oil contain?
A.91,500 BTU
B.140,000 BTU
C.1,000 BTU
D.250,000 BTU
Explanation: One gallon of No. 2 fuel oil holds roughly 140,000 BTU. This high energy density is why oil heat delivers strong output even from modest firing rates.

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