INTERNATIONAL MECHANICAL CODE STUDY
GUIDE (STUDY GUIDE FOR THE
INTERNATIONAL MECHANICAL CODE)
QUESTIONS WITH PASSED ANSWERS!!
What is the clearance reduction above the appliance for a horizontal 24 gage
sheet metal connector over 1-inch glass fiber reinforced with wire on rear face
with vented airspace? Answer - 18 inches
[IFGC-T-308.4.2]
Working clearance of passageways around all sides of boilers shall have an
unobstructed width of not less than ____ inches. Answer - 18
[IMC-1004.3]
Safety or relief valves shall be installed directly into the safety or relief valve
opening on the boiler. The relief valve shall discharge _______ . Answer - by
gravity
[IMC-1006.5]
Low-water cutoff controls and flow sensing controls shall automatically stop
the _____ of the appliance when the water level drops below the lowest safe
water level. Answer - combustion operation
,[IMC-1007.2]
You do not need a permit when you _____ a mechanical system. Answer -
replace any minor part 106.1, IMC 2018 page 3
[IMC-106.1]
How much mechanical ventilation exhaust air is needed if you have a
refrigerant detector alarm in a Central Plant where you have one chiller with
775# of R-11 refrigerant and another chiller with 1225# of R-123 refrigerant?
Answer - 3500 cfm
[IMC-1105.6.3.2]
Refrigerant piping that crosses an open space that affords passageway in any
building shall be not less than ____ above the floor unless the piping is located
against the ceiling of such space. Answer - 7 feet 3 inches
[IMC-1107.2]
The use of air as a Test Gas is allowed to test _______ , ammonia, systems
provided that they are subsequently evacuated before charging with
refrigerant. Answer - R-717
[IMC-1108.2]
The IMC now ______ the use of PP (polypropylene) piping materials for
hydronic applications, using what method of conjoining joints? Answer - Heat
Fusion
, [IMC-1203.13]
A pipe in a hydronic pipe system in which the exterior temperature exceeds
_____ shall have a minimum clearance of 1 inch to combustible materials.
Answer - 250 degree F
[IMC-1206.5]
Hydronic piping systems shall be tested hydrostatically at one and one-half
times the maximum system design pressure, but not less than ______ . The
duration of each test shall be not less than 15 minutes. Answer - 100 psi
[IMC-1208.1]
The piping for a Fuel Oil system shall be sized where the minimum size of a
supply line shall be _____ inch inside diameter nominal pipe or _____ inch
outside diameter tubing. Answer - 3/8 and 3/8
[IMC-1305.1]
Flammable liquids that have a flash point below 73 degrees F. and a boiling
point at or above 100 degrees F. is known as: Answer - Class 1B
[IMC-202]
Low pressure steam boilers operate at pressure less than ___ pounds /sq. inch.
Answer - 15
GUIDE (STUDY GUIDE FOR THE
INTERNATIONAL MECHANICAL CODE)
QUESTIONS WITH PASSED ANSWERS!!
What is the clearance reduction above the appliance for a horizontal 24 gage
sheet metal connector over 1-inch glass fiber reinforced with wire on rear face
with vented airspace? Answer - 18 inches
[IFGC-T-308.4.2]
Working clearance of passageways around all sides of boilers shall have an
unobstructed width of not less than ____ inches. Answer - 18
[IMC-1004.3]
Safety or relief valves shall be installed directly into the safety or relief valve
opening on the boiler. The relief valve shall discharge _______ . Answer - by
gravity
[IMC-1006.5]
Low-water cutoff controls and flow sensing controls shall automatically stop
the _____ of the appliance when the water level drops below the lowest safe
water level. Answer - combustion operation
,[IMC-1007.2]
You do not need a permit when you _____ a mechanical system. Answer -
replace any minor part 106.1, IMC 2018 page 3
[IMC-106.1]
How much mechanical ventilation exhaust air is needed if you have a
refrigerant detector alarm in a Central Plant where you have one chiller with
775# of R-11 refrigerant and another chiller with 1225# of R-123 refrigerant?
Answer - 3500 cfm
[IMC-1105.6.3.2]
Refrigerant piping that crosses an open space that affords passageway in any
building shall be not less than ____ above the floor unless the piping is located
against the ceiling of such space. Answer - 7 feet 3 inches
[IMC-1107.2]
The use of air as a Test Gas is allowed to test _______ , ammonia, systems
provided that they are subsequently evacuated before charging with
refrigerant. Answer - R-717
[IMC-1108.2]
The IMC now ______ the use of PP (polypropylene) piping materials for
hydronic applications, using what method of conjoining joints? Answer - Heat
Fusion
, [IMC-1203.13]
A pipe in a hydronic pipe system in which the exterior temperature exceeds
_____ shall have a minimum clearance of 1 inch to combustible materials.
Answer - 250 degree F
[IMC-1206.5]
Hydronic piping systems shall be tested hydrostatically at one and one-half
times the maximum system design pressure, but not less than ______ . The
duration of each test shall be not less than 15 minutes. Answer - 100 psi
[IMC-1208.1]
The piping for a Fuel Oil system shall be sized where the minimum size of a
supply line shall be _____ inch inside diameter nominal pipe or _____ inch
outside diameter tubing. Answer - 3/8 and 3/8
[IMC-1305.1]
Flammable liquids that have a flash point below 73 degrees F. and a boiling
point at or above 100 degrees F. is known as: Answer - Class 1B
[IMC-202]
Low pressure steam boilers operate at pressure less than ___ pounds /sq. inch.
Answer - 15
