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National Standard Master Mechanical

ICC Exam Workbook Sample Questions

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73. Ducts that exhaust clothes dryers must not penetrate or be located within any _________________________________ required by the International Building Code to be fire-resistance rated. Exceptions ignored.

A. draftstopping
B. fireblocking
C. firewall
D. floor/ceiling
E. all of the above

74. Every hot water boiler must have a ___________________.

A. pressure gauge
B. temperature gauge
C. combination pressure and temperature gauge
D. A and B or C
E. none of the above

75. Additions, alterations or repairs may not cause an existing mechanical system to become _____________,

A. unsafe
B. in compliance with the code
C. obsolete
D. all of the above

76. The purpose of the code is to establish _______________ standards to provide a reasonable level of safety, health, property protection and public welfare by regulating and controlling the design, construction, and installation, quality of materials, location, operation and maintenance or use of mechanical systems.

A. maximum
B. acceptable
C. minimum
D. logical

77. In a refrigeration system, where a compressor is used as a booster to obtain an intermediate pressure and discharges into the suction side of another compressor, the booster compressor is considered to be a part of the __________, provided that it is protected by a pressure relief device.

A. high side
B. low side
C. compression side
D. none of these

78. Underground ducts that are encased in concrete must be ___________ and secured prior to pouring the concrete encasement.

A. marked
B. tested
C. filled with water
D. sealed

79. The maximum air temperature within nonmetallic ducts may not exceed ___________________.

A. 108ºF
B. 212ºF
C. 250ºF
D. 350ºF

80. The use of gypsum boards to form plenums must be limited to systems where the air temperatures do not exceed ___________ and the building and mechanical system design conditions are such that the gypsum board surface temperature will be maintained above the airstream dew-point temperature.

A. 125ºF
B. 150ºF
C. 225ºF
D. 325ºF

81. A hydronic piping system must not be in direct contact with building materials that cause the piping material to _______________________, or that interfere with the operation of the system.

A. degrade
B. corrode
C. degrade or corrode
D. cool down

82. The gauge glass must be installed so that the _______________ is at the normal boiler water level.

A. top
B. midpoint
C. bottom
D. none of these

83. Ventilation must be provided in an approved manner in battery-charging areas for powered industrial trucks and equipment _____________________. Exceptions ignored.

A. to prevent a dangerous accumulation of vapor pressure
B. to provide storage cell cooling
C. reduce chances of oxygen depletion
D. to prevent a dangerous accumulation of flammable gases

84. The use of gypsum boards to form air shafts (ducts) must be limited to return air systems where the air temperatures do not exceed 125ºF and the gypsum board surface temperature is maintained above the __________________temperature.

A. ambient room temperature
B. outside temperature
C. inside temperature
D. airstream dew-point

85. For smoke barrier construction the total leakage area of the barrier is the product of the smoke barrier gross area times the allowable leakage area ratio, plus the area of other openings such as gaps and operable windows. Compliance must be determined by achieving the ___________________ air pressure difference across the barrier with the system in the smoke control mode for mechanical smoke control systems.

A. minimum
B. maximum
C. balanced
D. none of these

86. A smoke control system must be designed to consider the adverse effects of ________________.

A. wind
B. gravity
C. magnetism
D. climate change

87. All provisions in the appendices of the IMC apply in all cases. True of False


88. Electrical equipment that depends on the natural circulation of air and ____________________ for cooling of exposed surfaces shall be installed so that room airflow over such surfaces is not prevented by walls or by adjacent installed equipment.

A. independent fans
B. heat sinks
C. convection principles
D. direct contact of cooling fins

89. Air necessary for complete combustion of a fuel, including theoretical air and excess air.

A. Makeup air
B. Vent air
C. Combustion air
D. Depletion air

90. In concealed locations where piping, other than cast-iron or steel, is installed through holes or notches in studs, joists, rafters or similar members less than __________________ from the nearest edge of the member, the pipe must be protected by shield plates.

A. 1.5 inches
B. 3 inches
C. 4.5 inches
D. 6 inches

91. Solar thermal equipment exposed to vehicular traffic has to be installed not less than _______________ above the finished floor. Exception: This section must not apply where the equipment is protected from motor vehicle impact.

A. 3 feet
B. 10 feet
C. 6 feet
D. 2 feet

92. Fuel-burning appliances and equipment having ______________ and that use combustion air from the machinery room may not be installed in a machinery room. Exceptions ignored.

A. open flames
B. internal heat exchanges
C. multiple burners
D. none of these

93. The required gauging the fill level inside oil tanks by means of measuring sticks is ____________________.

A. the method of choice
B. the most accurate method permitted
C. the only permitted method
D. not permitted

94. __________________ is required for each cooling or evaporator coil or fuel-fired appliance that produces condensate, where damage to any building components will occur as a result of overflow from the equipment drain pan or stoppage in the condensate drain piping.

A. An inline dryer unit
B. A heated collector unit
C. A secondary drain or auxiliary drain pan
D. A universal dryer unit
E. none of these

95. A gas-tight joint obtained by the joining of metal parts with metallic mixtures or alloys which melt at a temperature above 1,000ºF, but lower than the melting temperature of the parts to be joined.

A. solder joint
B. weld joint
C. brazed joint
D. fused joint

96. Subslab soil exhaust system ducts must extend through the roof and terminate at least 6 inches above the roof and at least _______________ from any operable openings or air intake.

A. 6 inches
B. 8 feet
C. 5 feet
D. 10 feet

97. Water heaters utilized for both potable water heating and space-heating applications must be sized to prevent the space-heating load from diminishing the required _______________________

A. space-heating capacity
B. potable water-heating capacity
C. Both A and B
D. none of these

98. The small appliance circuit load in a dwelling unit, is calculated at _____________ for each 2-wire mall-appliance branch circuit as covered by 210.11(C)(1). Where the load is subdivided through two or more feeders, the calculated load for each must include not less than ______________ for each 2-wire small appliance branch circuit.

A. 500 volt-amperes, 1500 volt-amperes
B. 1000 volt-amperes, 1000 volt-amperes
C. 1500 volt-amperes, 1500 volt-amperes
D. 2000 volt-amperes, 1000 volt-amperes

99. The minimum chimney connector thickness for a low-heat appliance with an 18" diameter connector is:

A. 0.064 (No. 16 gage)
B. 0.075 (No. 14 Gage)
C. 0.105 (No. 12 Gage)
D. 0.135 (No. 10 Gage)

100. The high-pressure gas equation is used for sizing pipe in gas systems with a pressure of _____________ or less.

A. 1.5 psi
B. 3.0 psi
C. 10.5 psi
D. 20 psi
E. none of the above

101. Wind turbines shall be required to have a readily accessible manual shutdown button or switch. Operation of the button or switch shall result in a parked turbine state that shall either stop the turbine rotor or allow limited rotor speed combined with a means to de-energize the turbine output circuit. Exception: Turbines with a swept area of less than _____________ shall not be required to have a manual shutdown button or switch.

A. 100 sq ft
B. 250 sq ft
C. 538 sq ft
D. 1000 sq ft

102. Provisions must be made to prevent the formation of ________________ on the exterior of any duct.

A. dust
B. condensation
C. static electricity
D. mold
E. all of these

103. Hazardous exhaust systems that penetrate a floor/ceiling assembly must be enclosed in a ____________________________________________ in accordance with the International Building Code.

A. stainless steel welded raceway
B. sealed metal conduit
C. fire-resistance-rated shaft constructed
D. any of these

104. For cord-and-plug-connected equipment in other than storable pools, the flexible cords shall not exceed ____ ft in length.

A. 3
B. 6
C. 10
D. 15

105. On a fuel oil system, a relief valve must be installed on the pump discharge line where a valve is located __________________ the pump and the pump is capable of exceeding the pressure limitations of the fuel oil system.

A. upstream from
B. downstream of
C. upstream or downstream of
D. none of these

106. A round duct 8" in diameter is utilized to convey abrasive hazardous exhaust what is the minimum nominal thickness of the galvanized metal wall.

A. 0.040 inch (No. 20 Gage)
B. 0.064 inch (No. 16 Gage)
C. 0.079 inch (No. 14 Gage)
D. 0.028 inch (No. 24 Gage)

107. Appliances installed in pits or excavations must not come in direct contact with the surrounding soil. The sides of the pit or excavation must be held back a minimum of ________________ from the appliance. Where the depth exceeds 12 inches below adjoining grade, the walls of the pit or excavation must be lined with concrete or masonry

A. 18 inches
B. 6 inches
C. 12 inches
D. none of these

108. In a fuel oil system a __________must be installed on the fuel-oil supply line at the entrance to the building. Inside or above-ground tanks are permitted to have valves installed at the tank.

A. check valve
B. backflow valve
C. shutoff valve
D. explosion proof vented valve
E. none of these

109. Where a smoke detection system is installed in all areas served by the duct in which the damper will be located, the smoke dampers is permitted to be controlled by the smoke detection system.


110. What is the minimum total natural ventilation opening to the outdoors that is required for a room with 1,000 square feet of floor area the room is occupied by people?

A. 9.0 square feet
B. 18.0 square feet
C. 33.3 square feet
D. 40 square feet

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