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National Standard Journeyman Mechanical

ICC Exam Workbook Sample Questions

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32. 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

33. A 35,000 Btu per hour input draft-hood equipped water heater with a 4-inch-diameter draft hood outlet, 2 feet of connector rise, and 4 feet of horizontal length is to be common vented with a 100,000 Btu per hour fan-assisted furnace with a 4-inch-diameter flue collar, 3 feet of connector rise, and 6 feet of horizontal length. The common vent consists of a clay tile-lined masonry chimney with a 30-foot height. The chimney is not exposed to the outdoors below the roof line. The internal dimensions of the clay tile liner are nominally 8 inches by 12 inches. What are the recommended vent connector diameters, and is this an acceptable installation?

A. Water Heater Vent Connector Diameter: 4 inch, Furnace Vent Connector Diameter: 4 inch, But Masonry Chimney is an not an acceptable size.
B. Water Heater Vent Connector Diameter: 4 inch, Furnace Vent Connector Diameter: 4 inch, The Masonry Chimney is an acceptable installation.
C. Water Heater Vent Connector Diameter: 3 inch, Furnace Vent Connector Diameter: 6 inch, The Masonry Chimney is an acceptable installation.
D. Water Heater Vent Connector Diameter: 4 inch, Furnace Vent Connector Diameter: 4 inch, The Masonry Chimney is not an acceptable installation.

34. Installations exhausting more than 200 cubic feet per minute must be provided with ___________________.

A. a backdraft damper
B. a lint filter at termination
C. a vertical termination cap
D. makeup air

35. 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

36. What is the maximum capacity in cubic feet of gas per hour for schedule 40 metallic pipe 1-1/4" nominal size with a run length of 150 feet? The fuel is natural gas with and inlet pressure of less than 2 psi and a pressure drop of 0.5 inches on a water column.

A. 424
B. 322
C. 99
D. 296

37. For conductors supplying a single motor, motor controller nameplate current ratings are permitted to be derived based on the ____________ value of the motor current using an intermittent duty cycle and other control system loads, if present.

A. phase
B. intrinsic root squared
C. rms
D. meter measured

38. _________________ ducts and air connectors may not pass through any fire-resistance-rated assembly.

A. Hot or cold air
B. Steel
C. Flexible
D. Aluminum

39. The minimum local exhaust intermittent ventilation rate in cubic feet per minute for a kitchen in a one or two family dwelling is:

A. 25 cfm
B. 50 cfm
C. 100 cfm
D. 200 cfm

40. The minimum chimney connector thickness for a low-heat appliance with a 20" diameter connector is:

A. 0.022 (No. 26 Gage)
B. 0.028 (No. 24 Gage)
C. 0.034 (No. 22 Gage)
D. 0.064 (No. 16 Gage)

41. Where a submersible pump is used in a metal well casing, the well casing must be connected to the pump circuit equipment ________________.

A. feed wire system
B. grounded breaker system
C. GFI neutral conductor
D. grounding conductor

42. Every refrigerant-containing part of every system that is erected on the premises, except compressors, condensers, vessels, evaporators, safety devices, pressure gauges and control mechanisms that are listed and factory tested, must be tested and proved tight after complete installation, and before operation. Tests must be performed with an inert dried gas including, but not limited to, nitrogen and carbon dioxide. ____________________________ may not be used. Exceptions ignored.

A. oxygen
B. air
C. combustible gases
D. any of these
E. none of these

43. Air exhausted from spraying operations may be recirculated to conserve a temperature stable spray environment. Exceptions ignored.


44. In hydronic piping systems ____________________ must be installed on connections to mechanical equipment and appliances. This requirement does not apply to components of a hydronic system such as pumps, air separators, metering devices and similar equipment.

A. shutoff valves
B. check valves
C. reduction valves
D. booster valves

45. The inside lower edge of canopy-type Type I and II commercial hoods must overhang or extend a horizontal distance of not less than 6 inches beyond the edge of the top horizontal surface of the appliance on all open sides. The vertical distance between the front lower lip of the hood and such surface may not exceed _______________________.

A. 4 feet
B. 3 feet
C. 2 feet
D. 1 foot

46. Underground fuel gas piping systems must be installed a minimum depth of _______________ below grade, except for individual outside appliances. Individual lines to outside lights, grills or other appliances must be installed a minimum of _______________ below finished grade, provided that such installation is approved and is installed in locations not susceptible to physical damage.

A. 8 inches, 12 inches
B. 12 inches, 8 inches
C. 12 inches, 12 inches
D. none of these
47. Fuel-fired furnaces and boilers may not be installed in closets and alcoves.


48. For combustion, ventilation and dilution air openings used to connect indoor spaces each opening must have a minimum free area of 1 square inch per 1,000 Btu/h of the total input rating of all appliances in the space, but not less than 100 square inches. One opening must commence within _____________ of the top and one opening shall commence within _____________ of the bottom of the enclosure. The minimum dimension of air openings shall be not less than 3 inches (76 mm).

A. 9 inches, 9 inches
B. 12 inches, 12 inches
C. 18 inches, 12 inches
D. 12 inches, 18 inches

49. Fire dampers are not required at penetrations of shafts where steel exhaust subducts extend at least ________________ in exhaust shafts provided that there is a continuous airflow upward to the outdoors;

A. 10 inches vertically
B. 10 feet horizontally
C. 22 inches vertically
D. 2 feet above a point 10 feet horizontally from any point on a roof

50. Air that is introduced into a draft hood and is mixed with the flue gases.

A. combustion air
B. depleted air
C. dilution air
D. intake air

51. A vented fuel-burning appliance is located in the same room or space an exhaust hood, This configuration can work if:

A. Provisions are made to prevent the hood system from interfering with normal operation of the appliance vents.
B. Common vents are used for both exhaust and makeup air.
C. If power vents are used for both exhaust and makeup air.
D. None of the above, it is not permitted.

52. A device that provides a means for connecting intersystem bonding conductors for communications systems to the grounding electrode system.

A. Grounding Electrode Conductor
B. Intersystem Bonding Termination.
C. Grounding Electrode
D. Explosion proof Apparatus

53. For fuel gas piping, the maximum support spacing for 1-1/2" steel pipe nominal run in a vertical direction is ______________________ .

A. 4 feet
B. 6 feet
C. 8 feet
D. every floor level

54. The [IMC] does not require the removal, alteration or abandonment of, nor prevent the continued utilization and maintenance of, a mechanical system _______________________________.

A. that is substantially in compliance with the code.
B. that was installed before the adoption of the code.
C. lawfully in existence at the time of the adoption of the code.
D. none of the above.

55. Compartments housing piping, pumps, air eliminators, water separators, hose reels and similar equipment used in aircraft fueling and defueling operations must be adequately ventilated ___________________________.

A. at floor level
B. within the floor itself.
C. at ceiling level
D. at floor level or within the floor itself

56. 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

57. Manual dampers may not be used in connectors except in chimney connectors serving _________________________ appliances.

A. coal burning
B. wood burning
C. solid fuel-burning
D. oil burning
E. gas burning

58. Return air from a dwelling unit must not be discharged into ______________________.

A. another dwelling unit
B. a closet
C. a room
D. a bath or toilet room

59. R-22 Refrigerant has what refrigerant classification.

A. A1
B. A2
C. A3
D. B1

60. Subslab soil exhaust system ducts must extend through the roof and terminate at least ___________________ above the roof and at least 10 feet from any operable openings or air intake.

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

61. In a liquid fuel oil system all vent caps must have a minimum free open area equal to the cross-sectional area of the vent pipe and may not employ screens finer than __________ mesh.

A. No. 2
B. No. 8
C. No. 4
D. No. 10

62. The installation of gaseous hydrogen systems must be in accordance with the applicable requirements of:

A. the International Mechanical Code
B. the International Fire Code
C. Fuel Gas Code
D. International Building Code
E. all of the above

63. A device responsive to changes in pressure, temperature or level for turning on, shutting off or throttling the gas supply to an appliance.

A. damper
B. check valve
C. limit control
D. pressure switch

64. Heating, ventilating and air-conditioning systems of all structures must be designed and installed for efficient utilization of energy in accordance with ____________________________.

A. the International Energy Conservation Code
B. the Paris Climate Accord
C. the Environmental Protection Agency
D. the International Efficiency Conservation Code

65. Heating and air-conditioning systems of the central type must be provided with approved air filters. Filters must be installed in the ___________________, upstream from any heat exchanger or coil, in an approved convenient location.

A. forced air system
B. plenum
C. burner unit
D. return air system

66. A 6 foot long wall mounted canopy hood is used above a heavy-duty range. What is the minimum required net exhaust airflow for this hood in cubic feet per minute?

A. 400 cubic feet per minute
B. 1200 cubic feet per minute
C. 2400 cubic feet per minute
D. 3600 cubic feet per minute

67. Some but not all of the requirements for studwall cavities and the spaces between solid floor joists utilized as air plenums are that they must ____________________________.

A. be utilized as a plenum for supply air
B. not be part of a required fire-resistance-rated assembly
C. not convey air from more than one floor level
D. not be isolated from adjacent concealed spaces by approved fireblocking as required in the International Building Code
E. B and C

68. The minimum chimney connector thickness for a low-heat appliance with a 3" diameter connector is:

A. 0.022 (No. 26 Gage)
B. 0.028 (No. 24 Gage)
C. 0.034 (No. 22 Gage)
D. 0.064 (No. 16 Gage)

69. In the inspection, testing and purging of fuel gas piping, the test pressure must be measured with a manometer or with a pressure-measuring device designed and calibrated to read, record, or indicate a pressure loss caused by leakage during the pressure test period. The source of pressure must be isolated before the pressure tests are made. Mechanical gauges used to measure test pressures shall have a range such that the highest end of the scale is not greater than ________ times the test pressure.

A. two
B. three
C. five
D. ten

70. Connectors must connect to a chimney flue at a point not less than ________________ above the lowest portion of the interior of the chimney flue.

A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches

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