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2012 NC Mechanical Code – Level 2 of 31 Revised: 10/2016

Level II Chapter 2 Worksheet 1. _________ means having access to but which first may require the removal of a

panel, door, or similar covering of the item described. a. approved c. access b. ready access d. access (to) 2. By definition "Approved" means approved by the _______________ or other

authority having jurisdiction.

a. mechanical official c. Wake County Court b. health department d. local police

3. An appliance which is so constructed and installed that all air for combustion is

derived from and all flue gases are discharged to the outside atmosphere is a(n) _________ _________.

a. direct vent appliance c. gas appliance b. unvented appliance d. balanced appliance

4. A _________ is the pipe which connects a fuel appliance to a chimney

a. chimney connector c. metal chimney b. flue connector d. draft hood

5. A labeled device, equipment or material, indicates that it has been evaluated and to

which have been affixed a label, seal, symbol or other identifying mark of a nationally recognized testing agency and complies with applicable _________.

a. codes c. nationally recognized standards b. testing d. inspector requirements

6. Listed is a term used for equipment or materials that have been tested and listed by

a _________.

a. local inspector c. contractor b. government agency d. nationally recognized testing agency


Level II Chapter 2 Answer Key

1. D. ACCESS (TO)

2. A. MECHANICAL INSPECTOR

3. A. DIRECT VENT APPLIANCE

4. A. CHIMNEY CONNECTOR

5. C. NATIONALLY RECOGNIZED STANDARDS

6. D. NATIONALLY RECOGNIZED TESTING AGENCY


Level II Chapter 3 Worksheet

1. Condensate shall not discharge into a(n): a. street c. sidewalk b. alley d. all of the above 2. What is the minimum depth of a drain pan? a. 1 ½ inches c. 2 inches b. 1 inch d. 1¾ inches 3. Interior spaces intended for human occupancy shall be provided with active or

passive space heating systems capable of maintaining a minimum indoor temperature at:

a. 65°F c. 70°F b. 68°F d. 72°F 4. When installing HVAC equipment in an attic what is the minimum size access door

allowed? a. 20 inches X 24 inches c. 20 inches X 30 inches b. 34 inches X 38 inches d. 36 inches X 40 inches

5. A permanent factory-applied nameplate shall be affixed to the appliance on which

shall appear in legible lettering providing at least the following information:

a. manufacturer’s name or trademark, model number and serial number b. manufacturer’s name, electrical rating, and seal or mark of the approved agency c. manufacturer’s name or trademark, model number, serial number, and the seal

or mark of the approved agency d. name and trademark of the manufacturer

6. Electrical wiring, controls and connections to equipment and appliances regulated by

this code shall be in accordance with:

a. International Mechanical Code with NC Amendments b. NC Electrical Code c. Listed manufacturer’s instructions d. All of the above.


7. Guards provided for roof mounted appliances and equipment shall be constructed so as to prevent the passage of a sphere

a. 4 inches in diameter c. 21 inches in diameter b. 6 inches in diameter d. 24 inches in diameter

8. The fuel input rate shall not be increased or decreased beyond:

a. the limit rating for the altitude and fuel pressure at which the appliance is

installed b. the permanent factory applied nameplate label information c. 20 psi or 2 psi respectively d. the limit rating for the altitude at which the appliance is installed.

9. For structures located in a special flood-hazard area, mechanical systems shall be:

a. placed at or above the based flood elevation b. protected so as to prevent water entering or accumulating within the equipment,

appliances, ducts, or plenum space during floods up to the base flood elevation c. neither a or b d. either a or b

10. Cutting, notching and boring holes in structural steel framing shall be:

a. prescribed by a registered design professional b. one-fourth from edge c. two inches from edge d. twenty-five percent of depth

11. Appliances shall not be located in a hazardous location unless:

a. approved by the mechanical inspector b. it complies with applicable ARS standards c. listed and approved for the specific installation d. all of the above

12. Fuel-fired appliances shall not be located or obtain combustion air from:

a. sleeping rooms c. bathrooms b. storage closets d. all of the above

13. A fuel-fired furnace installed in a closet less than 12 times the total volume or the fuel-fired furnace:

a. is prohibited b. allowed if listed for such installation c. allowed if outside air is provided d. none of the above


14. An electric hot water heater installed in a private garage shall be elevated such that the ignition source is located:

a. 18 inches above the floor surface where unprotected from vehicle impact b. 72 inches above the floor surface where unprotected from vehicle impact c. electric hot water heater is not required to be elevated d. 18 inches above the floor surface where protected from vehicle impact

15. Below grade installations shall be provided with:

a. natural drain c. sump pump b. automatic lift d. any of the above



1. D 307.2.1

2. A 307.2.3(1)

3. B 309.1

4. C 306.3

5. C 301.6

6. B 301.7

7. C 306.5.1

8. D 301.9

9. A 301.13

10. A 302.5.1

11. C 303.2

12. D 303.3

13. B 303.5

14. D 304.3

15. D 304.10.4


Level II Chapter 4 Worksheet 1. Outdoor ventilation air requirements for buildings are defined by ______________.

a. ASHRAE 45 c. Table 403.3 b. local practice d. SMACNA

2. What is the minimum distance of a ventilation air intake from a lot line?

a. 0 feet c. 10 feet b. 5 feet d. 50 feet

3. What is the maximum size opening in a residential air intake screen which

terminates outdoors?

a. ⅛-inch c. ½-inch b. ¼-inch d. ¾-inch

4. What is the minimum required outdoor ventilation air required for a 2000 square

foot florist shop?

a. 225 cfm c. 520 cfm b. 340 cfm d. 630 cfm

5. Ventilation systems for enclosed parking garages are not required to operate Continuously where the system is arranged to operate automatically upon detection of vehicle operation or the presence of occupants:

a. automatic detection devices c. mechanically operated dampers b. not required in un-confined spaces d. approved automatic detection devices


Level II

Chapter 4 Answer Key

1. C TABLE 403.3

2. C 401.4 (1)

3. C TABLE 401.5

4. A TABLE 403.3 SALES

15 PEOPLE/1000 SF X 2000 SF = 30 PEOPLE

7.5 CFM/PERSON X 30 PEOPLE = 225 CFM

5. D 404.1



1. Commercial clothes dryer exhaust duct shall have a minimum clearance of _____

inches to combustible materials.

a. 1 c. 6 b. 10 d. 2

2. Exhaust systems are permitted to exhaust to

a. crawl space c. storage rooms b. outdoors d. Either a or b

3. Duct systems serving Type I hoods shall be constructed of ______________. a. 16 Gage steel or 18 Gage stainless steel c. fire brick b. fire rated gypsum board d. treated wood. 4. Grease hood exhaust duct systems less than 75 ft. may __________________.

a. be installed level b. be sloped not less than one-fourth-unit vertical in 12 units c. be sloped not less than one inch per foot away from the hood d. either b or c

5. The minimum velocity permitted in an exhaust hood duct system is

a. 500 fpm c. 1250 fpm b. 1000 fpm d. 1500 fpm

6. All Type I hoods shall be constructed of ________ gauge steel minimum and

________ gauge stainless minimum.

a. 18, 20 c. 22,24 b. 20, 22 d. all of the above

7. Every portion of a Type I hood shall have a clearance from combustible construction

of not less than ________ inches unless protected by approved methods.

a. 6 c. 12 b. 8 d. 18


8. Which of the following is not required on a grease hood?

a. grease gutters c. maximum one gallon container to catch grease b. approved collection receptacle d. alarm to sound when grease container is full 9. Exhaust outlets shall terminate not less than _______ feet from adjacent

buildings, adjacent property lines and air intake openings.

a. 2 c.10 b. 5 d. 3

10. Every exhaust outlet which is located above the roof shall terminate at least ________ inches above the roof surface.

a. 12 c. 40 b. 36 d. 18

11. Residential range hoods when installed shall be vented with a. corrugated steel c. galvanized steel duct b. stainless steel duct d. either b or c 12. The minimum dryer exhaust size shall be.

a. 3 inch c. 3½ inch b. 4 inch d. 5 inch

13. Which of the following is not a requirement of dryer exhaust duct? a. no sheet metal screws in the joints b. joints must run in the direction of air flow c. ducts properly secured in place d. ducts must not exceed 50’ developed length 14. Clothes dryers shall exhaust to ________ .

a. the crawl space c. the outdoors b. the attic d. either

15. Each room when rubber cement is used or mixed shall be ventilated in accordance with the applicable provisions of ________ .

a. NFPA 91 c. either a or b b. NFPA 96 d. neither a nor b



1. C 504.7

2. B 501.2

3. A 506.3.1.1

4. B 506.3.7

5. A 506.3.4

6. A 507.4

7. D 507.9

8. D 507.8

9. C 506.3.12.3

10. C 506.3.12.1

11. D 505.1

12. B 504.6.1

13. D SECTIONS 504.6.1 THROUGH 504.6.7

14. C 504.4

15. A 502.17


Level II Chapter 6 Worksheet 1. The maximum length of listed flexible air duct material is _____________. a. 14 feet b. not limited c. 25 feet d. 50 feet 2. The minimum thickness of 16-inch duct constructed of aluminum in a residential

system is? a. 0.0157 b. 28 c. 0.023 d. 0.018 3. Duct linings must be removed a minimum of _____________ downstream of a fuel-

burning heater in a duct system. a. 36 inches b. 24 inches c. 6 inches d. 18 inches 4. Ducts shall not be installed in or within _______ of the earth. a. 2 inches b. 4 inches c. 6 inches d. 8 inches 5. The maximum length of listed flexible air duct connectors is _____________. a. 14 feet b. not limited c. 25 feet d. 50 feet


6. Nonmetallic ducts shall be constructed with Class 0 or Class I duct material in accordance with ______________.

a. ARI 700-95 b. UL 181 c. ASTM A 53 d. ASME B16.11

7. The design air temperature of air to be conveyed in flexible air duct and flexible air connectors shall be less than ___________________ .

a. 125°F b. 150°F c. 175°F d. 250°F

8. Fire dampers shall comply with the requirements of _____________. a. UL 181 b. ASTM E119 c. UL 555 d. ASTM C 411 9. Liquid adhesive coatings used on filters shall have a flash point of not lower than ________________ . a. 150°F b. 225°F c. 275°F d. 325°F 10. Metallic underground ducts not having an approved protective coating shall be completely encased in a minimum of ______________ of concrete.

a. 1 inch b. 2 inches c. 3 inches d. 4 inches


Level III Chapter 6 Answer Key

1. B 603.6.1.1

2. D TABLE 603.4

3. C 604.8

4. B 603.14

5. A 603.6.2.1

6. B 603.5

7. D 603.6.3

8. C 607.3.1

9. D 605.1

10. B 603.8



1. Fireplaces and solid-fuel burning appliances shall not be installed in _____________. a. bedrooms c. hazardous locations b. workshops d. dining rooms 2. The hearth extension from a fireplace stove shall be readily distinguishable from the

___________. a. hearth c. heat deflector b. fireplace stove d. surrounding floor 3. Vented wall furnaces shall be located so that a door cannot swing within _________

inches of an air outlet. a. 6 c. 18 b. 12 d. 24 4. With the exception of wall register models, a floor furnace shall not be placed closer

than __________ inches to the nearest wall. a. 6 c. 18 b. 12 d. 24 5. Floor furnaces shall be placed such that a drapery on similar combustible object will

not be nearer than _________ inches to any portion of the register. a. 6 c. 8 b. 12 d. 24 6. The lowest portion of the floor furnace shall have not less than a __________ inch

clearance from grade level. a. 6 c. 16 b. 12 d. 18


7. An excavation may be used for floor furnace required clearances as long as the

minimum clearance on the control side is at least _________ inches. a. 6 c. 16 b. 12 d. 18 8. Sauna rooms shall have a ventilation opening located near the top of the door and

at least _________ inches by ________ inches. a. 4, 8 c. 4, 12 b. 4, 10 d. 4, 16 9. When the heat-serving element of a sauna heater thermostat is not an integral part

of the sauna heater, it shall be located within ________ inches of the ceiling. a. 4 c. 8 b. 6 d. 12 10. A forced-air warm-air furnace shall have a minimum of _________ square inches

per _____btu/h of unobstructed openings for outside and return air. a. 2, 1000 c. 2, 2000 b. 4, 1000 d. 4, 2000 11. Heat pumps shall have a minimum unobstructed total area of outside and return air

ducts of not less than ________ square inches per _______ btuh. a. 4, 1000 c. 4, 2000 b. 6, 1000 d. 6, 2000 12. Outside air for a forced-air heating system shall not be taken closer than ______

feet from an appliance vent outlet. a. 3 c. 5 b. 4 d. 10 13. Return air cannot be taken from an area, the volume of which is less than _______

percent of the entire volume served by such a system. a. 10 c. 25 b. 20 d. 50 14. Required outside air inlets shall be covered with a screen having not less than

________ mesh. a. ¼-inch c. ½-inch b. ⅜-inch d. ¾-inch


15. Stationary fuel-cell power plants must be tested in accordance with _________. a. CSA America FC 1 c. NFPA 58 b. ANSI Z21.83 d. DOE regulations test procedures 16. Cooling towers shall be provided with __________. a. access c. ready access b. guard rails d. red paint 17. Unvented gas log heaters can only be installed in factory-built fireplaces where the

fireplace system has been specifically tested, listed, and labeled for such use in accordance with _____________.

a. UL 737 c. UL 127 b. UL 1482 d. NFPA 37 18. Fireplace inserts intended for installation in fireplaces shall be listed and labeled in

accordance with the requirements of __________, and shall be installed in accordance with the manufacturer’s installation instructions.

a. UL 1482 c. UL 1995 b. UL 2162 d. UL 729 19. Electric duct furnaces shall be tested in accordance with _____________.. a. UL 727 c. UL 1995 b. UL 391 d. UL 1240 20. Electric coin-operated clothes dryers shall be tested in accordance with _______ . a. UL 1240 c. UL 2158 b. NFPA 31 d. UL 896 21. Stationary engine generator assemblies shall meet the requirements of _______. a. UL727 c. UL1995 b. UL2200 d. UL923 22. Floor furnaces are not permitted to be installed in the floor of any aisle of a(n)

______________. a. auditorium c. place of assembly b. public hall d. all of the above


23. When a floor furnace has the lower 6 inches sealed by the manufacturer to prevent

the entrance of water, the required clearance from grade may be reduced to _______ inches.

a. 2 c. 6 b. 4 d. 12 24. Oil-fired pool and spa heaters shall be tested in accordance with ___________ . a. UL 1261 c. UL 391 b. UL 1995 d. UL 726 25. Access doors that are required to be removed for normal servicing of sauna heaters

shall _____________. a. be attached to the building c. be lockable b. not be attached to the building d. red in color 26. Capillary tube and bulb heat-sensing elements in sauna rooms must be attached to

the wall or another support and must be protected against ___________. a. electric shock c. backflow b. physical damage d. freeze thaw 27. Sauna heaters shall be equipped with a thermostat, which will limit the room

temperature to _________ . a. 194°F c. 32° b. 212°F d. 100°C 28. A timer for the main burner operation shall have a maximum operating time of

________. a. 15 minutes c. 1 hour b. 30 minutes d. 3 days 29. Cooling coils in warm air furnaces shall not be located_____from heat exchangers

unless listed and labeled for such purpose. a. within 10 feet c. further that 10 feet b. upstream d. downstream 30. The minimum unobstructed total area of the outside and return air ducts or

openings to a heat pump shall not be less than _______ sq. inches per 1000 btuh output rating or as indicated by the conditions of the listing f the heat pump.

a. 2 c. 6 b. 4 d. 8


Level II

Chapter 9

Answer Key

1. C 901.3

2. D 903.2

3. B 909.3

4. A 910.2

5. B 910.2

6. A 910.4

7. D 910.4

8. A 914.5

9. B 914.4

10. A 918.2

11. B 918.3

12. D 918.6 (1)

13. C 918.6 (4)

14. A 918.7 TO TABLE 401.6

15. B 924.1

16. C 908.2

17. A 903.3

18. A 905.1

19. C 911.1

20. B 909.3

21. B 915.1

22. B 910.2

23. A 910.4

24. D 916.1


25. B 914.3

26. B 914.4

27. A 914.4

28. C 914.4.1

29. B 918.9

30. A 918.3


Level II Chapter 11 Worksheet 1. What is the refrigerant number for Butane? a. R-12 c. R-600 b. R-744 d. R-170 2. Trifluoromethane is found under which group? a. B1 c. B2 b. A1 d. A3 3. What is the chemical formula for ammonia? a. CF4 c. SO2 b. NH3 d. CO2 4. Joints in refrigerant piping, installed in the field shall; a. be tested b. labeled by third party c. left open for visual inspection d. manufacturer fittings only 5. Gases used for testing refrigerant piping shall be inert dried gas. Air may be used to test for which of the following. a. R-718 c. R-23 b. R-600 d. R-717 6. When testing refrigerant systems, the test pressure shall be at least _____ the design pressure. a. equal to c. 2 times b. ASHRAE 15 d. 2½ times 7. Non-factory tested, field erected equipment and appliances shall be pressure

tested in accordance with ________.

a. Table 1103.1 c. Section 1108 b. Section 308 d. Section 109


8. Where equipment is located outside a building and within _______ feet of a

building opening, the equipment shall be governed by the occupancy classification

of the building.

a. 5 c. 15 b. 10 d. 20 9. Large mercantile occupancies are where more than _______ persons congregate to purchase personal merchandise. a. 50 c. 300 b. 100 d. 500

10. Mechanical or natural ventilation is required for any enclosed refrigeration system located outdoors and more than _______ feet from any building opening.

a. 5 c. 15 b. 10 d. 20 11. Exhaust from mechanical ventilation systems shall be discharged not less than

________ feet from a property line or openings into buildings.

a. 3 c. 15 b. 10 d. 20 12. Openings in exhaust ducts shall be covered with corrosion-resistant screens of

not less than _________ mesh.

a. ¼ inch c. ½ inch b. ⅜ inch d. ⅝ inch 13. In the equipment room, fusible plugs and purge systems shall terminate outside

of the structure at a location not less than ________ feet above the adjoining grade level.

a. 5 c. 15 b. 10 d. 20 14. Machinery rooms shall not have open flame-producing devices or continuously

hot surfaces over ________ degrees F permanently installed in the room.

a. 600 c. 1,000 b. 800 d. 1,200


15. Where refrigerants of Groups A-2, A-3, B-2 and B-3 are used, the machinery room shall conform to the __________ requirements.

a. Class 1, Division 1 c. Class I, Division 2 b. Class 2, Division 1 d. Class 2, Division 2 16. Enclosures shall not be required for connections for refrigerant piping between

condensing units and the nearest riser box when the connections do not exceed _________ feet in length.

a. 6 c. 10 b. 8 d. 12 17. Carbon steel pipe with a wall thickness of not less than Schedule 80 shall be

used for Group A2, A3, B2, or B3 refrigerant liquid lines for sizes _________ inch(es) and smaller.

a. 1 c. 1½ b. 1¼ d. 2 18. Schedule 40 carbon steel pipe shall be used for Group A1 or B1 refrigerant liquid

lines _________ inches and smaller.

a. 1½ c. 4 b. 3 d. 6 19. Type F steel pipe shall not be used for refrigerating lines having an operating

temperature less than _________ degrees F.

a. -10 c. -20 b. 10 d. 20 20. Annealed temper copper tube shall not be used in sizes larger than ________

inches.

a. 1 c. 1½ b. 1¼ d. 2 21. Mechanical joints shall not be used on annealed temper copper tube in sizes

larger than ________ inch.

a. ½ c. ¾ b. ⅝ d. ⅞


22. Joints and all refrigerant-containing parts of a refrigeration system located in an air duct shall be constructed to withstand a pressure of ________ percent of the higher of the design pressure or pressure relief device setting.

a. 100 c. 200 b. 150 d. 250 23. All systems containing more than __________ pounds of a refrigerant in systems

using positive-displacement compressors shall have stop valves.

a. 2.2 c. 6.6 b. 4 d. 8.8 24. All systems containing _________ pounds or more of a refrigerant shall have stop

valves.

a. 40 c. 80 b. 55 d. 100 25. Stop valves used with soft annealed copper tubing or hard-drawn copper tubing

_________ inch or smaller shall be securely mounted, independent of tubing or supports.

a. ½ c. ¾ b. ⅝ d. ⅞

26. A certificate of test shall be provided for all systems containing _______ pounds or more of refrigerant.

a. 40 c. 80 b. 55 d. 100

27. Any portion of a refrigerant system that is subject to physical damage must:

a. be removed c. covered to protect

b. hazard removed d. protected in an approved manner

28. Recovered refrigerants may be reused if:

a. filtered and dried before reuse c. owner assures its purity

b. used back into the system it was recovered from d. A or B


29. Which of the following systems are not required to be classified as high probability system?

a. vented closed loop c. direct system

b. indirect open spray d. none of the above

30. The design and construction of the machinery room shall be based:

a. on the high or low flammability c. on the IBC

b. on the floor area in sq. footage d. on the type of system classification

31. Openings in machinery rooms are permitted when:

a. motorized damper controlled

b. leak detectors are provided

c. no open flames in rooms

d. ducts and air handlers which operate at pressures lower than the room and

are sealed

32. Refrigerants of groups A2, A3, B2 and B3 used in machinery rooms must

meet the requirements of:

a. ASHRAE 15 c. Class 2 Division 1 of NFPA 72

b. Class 1 Division 2 of NFPA70 d. ASHRAE 84 of NFPA 70

33. Mechanical ventilation of machine rooms is required, natural ventilation may be used when:

a. remote controller at outside door

b. refrigerants of low flame probability

c. openings are sealed

d. the systems is outdoors and located more than 20 feet from any structure or

openings


34. Make-up air for machine rooms shall be provided through:

a. UL listed fans c. in accordance with IBC

b. openings located to avoid intake of exhaust d. none of the above

35. The maximum allowable amount of R-408A in a 2000 cubic-foot Institutional Occupancy is____ Lbs.

a. 4.9 c. 30

b. 42 d. 21

36. Rooms containing refrigeration machinery shall be designed and constructed by:

a. Engineer design professional c. Architectural design professional

b. in accordance with IBC and IMC d. a licensed contractor

37. Fuel-gas devices used with refrigeration systems shall be installed per

________________________.

a. IBC c. IPC

b. IFGC d. IFC

38. Used refrigerants of the same owner may be reused if tested and found to meet purity requirements of _____________.

a. ARC 70 c. ARA 700

b. ARI 700 d. AMN 800

39. The maximum permissible quantity of refrigerant in a unit system in a residence other than an exit access is ___________ pounds.

a. 22 c. 6.6

b. 66 d. 0


40. A clearly identified switch of the break-glass type shall provide on-only control of the __________ __________.

a. air handler c. emergency signs

b. thermostat d. ventilation fans


Level II

Chapter 11 Answer Key

1. C TABLE 1103

2. B TABLE 1103

3. B TABLE 1103

4. C 1107.7

5. D 1108.2 EX

6. A 1108.1

7. C 1102.1(6)

8. D 1103.2

9. B 1103.2 (5)

10. D 1105.6.EX

11. D 1105.6.1

12. A 1105.6.2

13. C 1105.7

14. B 1106.2

15. C 1106.4

16. A 1107.3

17. C 1107.5.1

18. D 1107.5.1

19. C 1107.5.1

20. D 1107.5.3

21. D 1107.5.3

22. B 1107.6

23. C 1107.8

24. D 1107.8.1


25. D 1107.8.2

26. B 1108.4

27. D 1101.3

28. B 1102.2.2.2

29. B 1103.3.2 EX

30. C 1105.1

31. D 1105.2

32. B 1106.4

33. D 1105.6 EX

34. D 1105.6.2

35. D 1104.2.1, TABLE 1103.1

36. B 1105.1

37. B 1101.5

38. B 1102.2.2.3

39. C TABLE 1104.3.2

40. D 1106.5.2



1. All chilled water piping and fittings shall be of: a. steel c. brass b. copper d. all of the above 2. After cutting, all pipe or tubing shall be ________. a. sanded c. cut b. reamed and chamfered d. flared 3. Pipe insulation shall be tested in accordance with _____________________.

a. ASTM D 2235 c. ASTM E 84 b. ASTM D 2486 d. ASTM D 3309

4. The potable water system shall be protected from backflow in accordance with the ____________________.

a. Building Code c. Electrical Code b. Energy Code d. Plumbing Code



1. D 1202.5 (TABLE 1202.5 MATERIAL)

2. B 1203.2

3. C 1204.1

4. D 1206.3

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