2012 Uniform Mechanical Code Ch 6

Front 1

Return air ducts, outside air ducts, plenums, or concealed spaces may be of combustible construction when

(A) in an office building

(B) serving a dwelling unit

(C) the building is two stories or less

(D) the building has a sprinkler system

Back 1

(B) serving a dwelling unit

Hint 1

602.2

Front 2

Joints of duct systems shall be made substantially tight by means of ____

(A) tape, mastic, or gasketing

(B) an approved duct sealant

(C) fire-retardant caulking

(D) nonporous caulking

Back 2

(A) tape, mastic, or gasketing

Hint 2

602.4

Front 3

Metal ducts installed in or under a concrete slab shall be ____

(A) insulated

(B) encased in at least 2 inch thick concrete

(C) covered with 4 mil

(D) approved for underground use polyethylene wrap

Back 3

(B) encased in at least 2 inch thick concrete

Hint 3

603.2

Front 4

The minimum distance from the ground to any metal duct shall not be less than inches.

(A) 2

(B) 4

(C) 6

(D) 12

Back 4

(B) 4

Hint 4

603.2

Front 5

The receptacle shall be securely suspended from the floor members and shall not be more than ___ inches below the floor opening.

(A) 12

(B) 18

(C) 24

(D) 48

Back 5

(B) 18

Hint 5

507.8.1

Front 6

Exit corridors, when required to be fire-resistive construction by the ____ shall not have ventilating ceilings.

(A) Fire Code

(B) Authority Having Jurisdiction

(C) Building Code

(D) NFPA

Back 6

(C) Building Code

Hint 6

606.1

Front 7

Where it is required to move under ducts for access to areas of the crawl space a minimum vertical clearance of ___ inches shall be required.

(A) 24

(B) 20

(C) 22

(D) 18

Back 7

(D) 18

Hint 7

603.1

Front 8

Insulation applied to the surface of ducts, including duct coverings, linings, tapes, and adhesives, located in a building shall have a flame-spread index not greater than

(A) 25

(B) 50

(C) 100

(D) 200

Back 8

(A) 25

Hint 8

604.1

Front 9

Insulation applied to the surface of ducts, including duct coverings, linings, tapes, and adhesives, located in a building shall have a smoke-developed rating of not more than ___

(A) 25

(B) 50

(C) 100

(D) 200

Back 9

(B) 50

Hint 9

604.1

Front 10

Crimp joints for round ducts shall have a contact lap of at least ___ inch(es).

(A) 1

(B) 1.5

(C) 2

(D) 2.5

Back 10

(B) 1.5

Hint 10

602.4

Front 11

Electrical wiring in plenums shall comply with ____, and California Electric Code.

(A) NFPA 54

(B) NFPA 70

(C) NFPA 262

(D) NFPA 211

Back 11

(C) NFPA 262

Hint 11

602.2(5)

Front 12

The temperature of the air conveyed in approved factory-made air-ducts is limited to ___

(A) 125

(B) 212

(C) 250

(D) 400

Back 12

(C) 250

Hint 12

603.3

Front 13

Furnaces supplying warm air to an underfloor space used as a plenum shall be equipped with an approved temperature limit control that will limit the outlet temperature to ___°F.

(A) 120

(B) 150

(C) 200

(D) 250

Back 13

(C) 200

Hint 13

607.7

Front 14

Supports for rectangular ducts when suspended from above, shall be installed

(A) on two opposite sides of each duct

(B) at no more than 12 foot intervals

(C) with a minimum of two 3/4-inch straps

(D) with a minimum of 20 gauge wire

Back 14

(A) on two opposite sides of each duct

Hint 14

603.2

Front 15

Back 15

D. horizontal swing

Hint 15

603.2.5

Front 16

Air-moving systems supplying air in excess of 2,000 cfm shall be equipped with

(A) an automatic shutoff

(B) fire dampers

(C) a fire-extinguishing system

(D) volume dampers

Back 16

(A) an automatic shutoff

Hint 16

608.1

Front 17

Factory-made air ducts and faced insulations shall have legibly printed on the exterior surface the following information ____

(A) thermal resistance (R) value at installed thickness

(B) maximum operating temperature

(C) maximum operating velocity

(D) name or mark of the listing agency

Back 17

(A) thermal resistance (R) value at installed thickness

Hint 17

604.1

Front 18

Smoke detectors for air duct installation shall be ____

(A) approved

(B) installed in accordance with the Electrical Code

(C) compatible with operating velocities, pressures, temperature, and humidity of the system

(D) tested before installation

Back 18

(C) compatible with operating velocities, pressures, temperature, and humidity of the system

Hint 18

608.1

Front 19

Automatic shutoff is not required ____

(A) when rooms have direct exit to the building exterior and the travel distance is less than 100 feet

(B) when rooms have direct access to exit corridors

(C) in R1 Occupancies

(D) in buildings of less than two stories

Back 19

(A) when rooms have direct exit to the building exterior and the travel distance is less than 100 feet

Hint 19

608.1

Front 20

When smoke detectors are required as part of an automatic shutoff system, they shall be installed in the _____

(A) return air duct ahead of any fresh-air inlet

(B) main supply air duct served by such equipment

(C) fresh-air inlet

(D) main return and the main supply duct

Back 20

(B) main supply air duct served by such equipment

Hint 20

608.1(5)

Front 21

Factory-installed smoke detectors installed in listed air-moving equipment may be used in lieu of smoke detectors installed in the main ____ served by such equipment.

(A) supply-air duct

(B) return-air duct

(C) outside-air duct

(D) supply and return air ducts

Back 21

(A) supply-air duct

Hint 21

608.1(5)

Front 22

The use of under-floor space as a supply plenum shall be limited to ____

(A) single-family dwellings

(B) residential construction

(C) dwelling units not more than two stories in height

(D) those structures where combustible construction is allowed

Back 22

(C) dwelling units not more than two stories in height

Hint 22

607.2

Front 23

Where gypsum products are exposed in ducts or plenums, the air temperature shall be restricted to a range from ____ °F.

(A) 0 to 120

(B) 32 to 125

(C) 50 to 125

(D) 50 to 212

Back 23

(C) 50 to 125

Hint 23

602.1

Front 24

When gypsum products are exposed in ducts or plenums, the ____

(A) gypsum shall be listed for such use

(B) moisture content shall be controlled so the material is not adversely affected

(C) gypsum products shall be adequately sealed

(D) gypsum product must be plenum rated

Back 24

(B) moisture content shall be controlled so the material is not adversely affected

Hint 24

602.1

Front 25

Exhaust ducts under positive pressure and venting systems shall not extend into or through _____

(A) ducts or plenums

(B) occupied spaces

(C) unheated spaces

(D) hazardous occupancies

Back 25

(A) ducts or plenums

Hint 25

602.1

Front 26

Ducts exposed to mechanical damage by vehicles or from other causes shall be

(A) prohibited

(B) protected by approved barriers

(C) reinforced

(D) enclosed

Back 26

(B) protected by approved barriers

Hint 26

603.4

Front 27

The minimum dimensions for access openings for fire dampers shall be ____

(A) adequate to permit inspection and maintenance of the damper and its operating parts

(B) the same size as the minimum dimension of the duct

(C) large enough to permit removal of the damper

(D) the diagonal of the access opening shall be the same length as the damper

Back 27

(A) adequate to permit inspection and maintenance of the damper and its operating parts

Hint 27

605.5

Front 28

The use of rated corridors in fire-resistive construction to convey air to or from adjoining rooms is

(A) an acceptable practice

(B) prohibited by the code

(C) permitted when the openings are protected with fire dampers

(D) permitted in buildings of three stories or less

Back 28

(B) prohibited by the code

Hint 28

602.1

Front 29

Each access door for a smoke damper or fire damper shall be labeled with letters not less than inch(es) high.

(A) 1/2

(B) 3/4

(C) 1

(D) 11/2

Back 29

(A) 1/2

Hint 29

605.5

Front 30

Smoke dampers and/or fire dampers shall be installed in a manner to ensure _____

(A) actuation by a control device

(B) closure within reasonable time limits

(C) no interference of dampers' operating parts from duct liners or external insulation

(D) movement within the rated partition

Back 30

(C) no interference of dampers' operating parts from duct liners or external insulation

Hint 30

605.6

Front 31

Fire dampers shall be

(A) field tested for operation (B) periodically inspected

(C) labeled by an approved agency

(D) securely fastened to duct work

Back 31

(C) labeled by an approved agency

Hint 31

605.2

Front 32

Smoke dampers shall

(A) comply with the referenced standard for leakage-rated dampers

(B) be tested by a certified installer

(C) be labeled by the manufacturer

(D) not be required in buildings less than four stories

Back 32

(A) comply with the referenced standard for leakage-rated dampers

Hint 32

605.1

Front 33

Vibration isolators to isolate equipment from metal ducts shall be of an approved material and not exceed ___ inches in length.

(A) 6

(B) 8

(C) 10

(D) 12

Back 33

(C) 10

Hint 33

602.7

Front 34

Insulation R-value need not exceed R 3.5 for a supply or return runout to an air terminal or outlet in a heating or cooling system when the runout length is less than ___ feet.

(A) 5

(B) 7

(C) 10

(D) 12

Back 34

(C) 10

Hint 34

604.1(3)