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Michigan (MI) Hydronic Heating, Cooling & Process
Piping Exam | Latest Verified Actual Questions and
Correct Detailed Answers
OVERVIEW DESCRIPTION:
The Milestone Certified Design Engineer (MCDE) exam is a professional certification for
individuals who design complex XProtect video surveillance systems. It validates expertise in
translating client requirements into secure, scalable, and technically sound proposals. The exam
covers nine key areas, including system architecture, product selection, cybersecurity, and the
use of design tools like the Milestone Solution Designer. Achieving MCDE certification is
essential for partners seeking Advanced or Premier status in the Milestone Channel Partner
Program.
QUESTION 1
What is the primary purpose of an expansion tank in a closed hydronic heating system?
A) To store extra water for system makeup
B) To absorb increased water volume due to thermal expansion
C) To filter out system debris
D) To increase system pressure
CORRECT ANSWER ✓ ✓
B) To absorb increased water volume due to thermal expansion
EXPERT RATIONALE:
The expansion tank’s key function is to accommodate the increased volume of water as
it heats up, thereby controlling pressure rise and preventing relief valve operation or
component stress.
QUESTION 2
According to typical Michigan code requirements, what is the minimum hydrostatic test
pressure for a hydronic system with a 50 psi design pressure?
A) 50 psi
B) 75 psi
C) 100 psi
D) 125 psi
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CORRECT ANSWER ✓ ✓
C) 100 psi
EXPERT RATIONALE:
The test must be at 1.5 times design pressure (75 psi) but not less than 100 psi;
therefore, 100 psi is the controlling minimum pressure for this test.
QUESTION 3
Which code is specifically applicable to process piping systems in Michigan?
A) ASME B31.9
B) ASME B31.3
C) ASME B31.1
D) ASME B31.5
CORRECT ANSWER ✓ ✓
B) ASME B31.3
EXPERT RATIONALE:
ASME B31.3 is the standard referenced for process piping systems, covering design,
materials, fabrication, and testing for chemical and petroleum plants, among other
facilities.
QUESTION 4
What is the typical minimum working pressure rating required for a residential
hydronic boiler?
A) 30 psi
B) 50 psi
C) 75 psi
D) 100 psi
CORRECT ANSWER ✓ ✓
A) 30 psi
EXPERT RATIONALE:
Residential hydronic boilers are typically required by code to have a minimum working
pressure rating of 30 psi for safe operation under normal conditions.
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QUESTION 5
Which of the following piping materials is commonly used for hydronic radiant floor
heating installations?
A) Galvanized steel
B) PVC
C) PEX
D) Black steel
CORRECT ANSWER ✓ ✓
C) PEX
EXPERT RATIONALE:
Cross-linked polyethylene (PEX) tubing is flexible, corrosion-resistant, and ideal for
radiant floor heating due to its ease of installation within floor assemblies.
QUESTION 6
The primary purpose of a pressure relief valve on a boiler is to:
A) Regulate system flow rate
B) Prevent excessive temperature
C) Prevent excessive pressure
D) Vent air from the system
CORRECT ANSWER ✓ ✓
C) Prevent excessive pressure
EXPERT RATIONALE:
A pressure relief valve is a critical safety device that automatically opens to discharge
water/steam if the system pressure exceeds a set limit, preventing catastrophic
failure.
QUESTION 7
What is the primary function of a circulator pump in a hydronic system?
A) To feed water into the system
B) To create flow and overcome friction loss in the piping
C) To pressurize the expansion tank
D) To cool the boiler
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CORRECT ANSWER ✓ ✓
B) To create flow and overcome friction loss in the piping
EXPERT RATIONALE:
The circulator pump provides the motive force to move heated or chilled water through
the distribution piping and terminal units, overcoming system pressure drops.
QUESTION 8
A hydronic system's air separator is typically located:
A) At the lowest point in the system
B) At the point of lowest pressure
C) At the point of highest temperature and lowest pressure
D) On the suction side of the circulator
CORRECT ANSWER ✓ ✓
C) At the point of highest temperature and lowest pressure
EXPERT RATIONALE:
Air separators are most effective where water temperature is highest (air is less
soluble) and pressure is lowest (air comes out of solution), which is often near the
boiler outlet.
QUESTION 9
Which of the following is a primary safety control for a hot water boiler?
A) Low-water cutoff
B) Zone valve
C) Balancing valve
D) Flow check valve
CORRECT ANSWER ✓ ✓
A) Low-water cutoff
EXPERT RATIONALE:
The low-water cutoff is a mandatory safety device that shuts down the boiler if the
water level drops too low, preventing overheating and potential damage.
Michigan (MI) Hydronic Heating, Cooling & Process
Piping Exam | Latest Verified Actual Questions and
Correct Detailed Answers
OVERVIEW DESCRIPTION:
The Milestone Certified Design Engineer (MCDE) exam is a professional certification for
individuals who design complex XProtect video surveillance systems. It validates expertise in
translating client requirements into secure, scalable, and technically sound proposals. The exam
covers nine key areas, including system architecture, product selection, cybersecurity, and the
use of design tools like the Milestone Solution Designer. Achieving MCDE certification is
essential for partners seeking Advanced or Premier status in the Milestone Channel Partner
Program.
QUESTION 1
What is the primary purpose of an expansion tank in a closed hydronic heating system?
A) To store extra water for system makeup
B) To absorb increased water volume due to thermal expansion
C) To filter out system debris
D) To increase system pressure
CORRECT ANSWER ✓ ✓
B) To absorb increased water volume due to thermal expansion
EXPERT RATIONALE:
The expansion tank’s key function is to accommodate the increased volume of water as
it heats up, thereby controlling pressure rise and preventing relief valve operation or
component stress.
QUESTION 2
According to typical Michigan code requirements, what is the minimum hydrostatic test
pressure for a hydronic system with a 50 psi design pressure?
A) 50 psi
B) 75 psi
C) 100 psi
D) 125 psi
,2|Page
CORRECT ANSWER ✓ ✓
C) 100 psi
EXPERT RATIONALE:
The test must be at 1.5 times design pressure (75 psi) but not less than 100 psi;
therefore, 100 psi is the controlling minimum pressure for this test.
QUESTION 3
Which code is specifically applicable to process piping systems in Michigan?
A) ASME B31.9
B) ASME B31.3
C) ASME B31.1
D) ASME B31.5
CORRECT ANSWER ✓ ✓
B) ASME B31.3
EXPERT RATIONALE:
ASME B31.3 is the standard referenced for process piping systems, covering design,
materials, fabrication, and testing for chemical and petroleum plants, among other
facilities.
QUESTION 4
What is the typical minimum working pressure rating required for a residential
hydronic boiler?
A) 30 psi
B) 50 psi
C) 75 psi
D) 100 psi
CORRECT ANSWER ✓ ✓
A) 30 psi
EXPERT RATIONALE:
Residential hydronic boilers are typically required by code to have a minimum working
pressure rating of 30 psi for safe operation under normal conditions.
,3|Page
QUESTION 5
Which of the following piping materials is commonly used for hydronic radiant floor
heating installations?
A) Galvanized steel
B) PVC
C) PEX
D) Black steel
CORRECT ANSWER ✓ ✓
C) PEX
EXPERT RATIONALE:
Cross-linked polyethylene (PEX) tubing is flexible, corrosion-resistant, and ideal for
radiant floor heating due to its ease of installation within floor assemblies.
QUESTION 6
The primary purpose of a pressure relief valve on a boiler is to:
A) Regulate system flow rate
B) Prevent excessive temperature
C) Prevent excessive pressure
D) Vent air from the system
CORRECT ANSWER ✓ ✓
C) Prevent excessive pressure
EXPERT RATIONALE:
A pressure relief valve is a critical safety device that automatically opens to discharge
water/steam if the system pressure exceeds a set limit, preventing catastrophic
failure.
QUESTION 7
What is the primary function of a circulator pump in a hydronic system?
A) To feed water into the system
B) To create flow and overcome friction loss in the piping
C) To pressurize the expansion tank
D) To cool the boiler
, 4|Page
CORRECT ANSWER ✓ ✓
B) To create flow and overcome friction loss in the piping
EXPERT RATIONALE:
The circulator pump provides the motive force to move heated or chilled water through
the distribution piping and terminal units, overcoming system pressure drops.
QUESTION 8
A hydronic system's air separator is typically located:
A) At the lowest point in the system
B) At the point of lowest pressure
C) At the point of highest temperature and lowest pressure
D) On the suction side of the circulator
CORRECT ANSWER ✓ ✓
C) At the point of highest temperature and lowest pressure
EXPERT RATIONALE:
Air separators are most effective where water temperature is highest (air is less
soluble) and pressure is lowest (air comes out of solution), which is often near the
boiler outlet.
QUESTION 9
Which of the following is a primary safety control for a hot water boiler?
A) Low-water cutoff
B) Zone valve
C) Balancing valve
D) Flow check valve
CORRECT ANSWER ✓ ✓
A) Low-water cutoff
EXPERT RATIONALE:
The low-water cutoff is a mandatory safety device that shuts down the boiler if the
water level drops too low, preventing overheating and potential damage.
