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NC H3 Technical & Business Law > Mechanical Code > Flashcards

Mechanical Code Flashcards

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1
Q

What is the minimum width of the required continuous solid flooring along the required access path to an attic appliance?

A

22 inches

Pg. 22 Mechanical Code

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2
Q

When smoke detectors are required by code, they shall be installed based on what?

A

NFPA 72

Pg. 74 Mechanical Code

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3
Q

When running PVC pipe underground for use as part of a domestic kitchen exhaust system, no more than _________ inches of PVC duct is allowed to extend above the concrete floor.

A

1 in

Pg. 49 Mechanical Code

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4
Q

When installing a duct heater with heat pumps or air conditioners, the maximum distance the heater can be from the air handling unit is?

A

4ft.

Pg. 93 Mechanical Code

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5
Q

Appliances requiring service are located on a flat foot that is 16ft above grade. There is also a 4ft parapet that hides the equipment from view from the street. Is a permanent means of access required for servicing the equipment?

A

Yes

Pg. 22 Mechanical Code

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6
Q

A domestic clothes dryer termination leaves the building and terminates less that 12in from the adjoining grade. It is impossible to relocate the wall cap, what can be done to meet code?

A

Dig a 200sq.in. area well under the wall cap.

Pg. 48 Mechanical Code

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7
Q

You are replacing a 10T rooftop package unit in a small commercial building. To ensure the system is properly sized, you want to run a load calculation. What load estimating procedure should you use for this building according to code?

A

ASHRAE/ACCA Standard 183

Pg. 26 Mechanical Code

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8
Q

You are installing a medium duty kitchen hood in a commercial application. The hood type is a single island canopy hood. The hood is 10ft long. How may CFM of total exhaust air will be required?

A

5000cfm
Pg. 56 Mechanical Code

500cfm per linear foot
Length=10ft
500 x 10= 5000cfm

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9
Q

Under what condition can UL listed and labeled Class 1 flexible air duct pass through a fire resistance rated assembly?

A

Never

Pg. 79 Mechanical Code

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10
Q

An electric resistance duct heater is installed in sheet metal ductwork that is lined with 1in of ASTM E-84 rated duct insulation. What is the installation requirement for the liner near the duct heater?

A

Interrupt liner 6in before and 6in after the heater.

Pg. 73 Mechanical Code

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11
Q

A bowling alley seating area is 3000sqft of the total buildings 18,000sqft. The seating area requires a minimum of ______ cubic feet of outside air per minute per the code based on the estimated occupant load and cfm per person.

A

1200cfm
Pg. 31, 36 Mechanical Code

Occupant density= 40(people) per 1000sqft
Outdoor Airflow Rate= 10cfm per person
40/1000 = x/3000
x=120
120 people

OAR= 120people x 10cfm per person
Outdoor Airflow Rate= 1200cfm

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12
Q

The minimum size of an oil supply line feeding an oil fired appliance shall be at least ______

A

3/8in

Pg. 120 Mechanical Code

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13
Q

You are installing an oil burning furnace in a residential application. The Furnace has a flame retention burner rated at a maximum capacity of 120,000 btu/hr. What is the minimum gage of the vent connector material if it is constructed of galvanized steel?

A

28 gage

Pg. 85 Mechanical Code

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14
Q

A small coffee shop serves sandwiches and other lightly prepared food and uses 6 commercial microwaves and 3 light duty electric convection ovens. Is a Type 1 Hood required for this application?

A

No

Pg. 55 Mechanical Code

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15
Q

When installing PVC pipe in concrete for down draft domestic kitchen exhaust duct, the PVC pipe shall not extend more than ______ above the concrete floor indoors.

A

1in

Pg. 49 Mechanical Code

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16
Q

What is the maximum outlet air temperature of a furnace in North Carolina?

A

200⁰

Pg. 72 Mechanical Code

17
Q

Bored holes shall not be closer than _____ to the edge of the stud.

A

.625in

Pg. 18 Mechanical Code

18
Q

Which of the following describes the code restrictions on condensate pump usage?

  • Must have a float switch to off-cycle the equipment in the event of a pump failure.
  • Can be used with or without gravity drainage possibilities.
  • Can be used only if the pump is installed in an emergency drain pan protected with a float switch that will off-cycle the equipment in the event of a pump failure if installed above finished building surfaces.
  • All of the above.
A

All of the above

Pg. 23 Mechanical Code

19
Q

Rooftop installations will require the installation of a permanent fixed means of access in the form of a ladder or roof hatch when the access height exceeds _______.

A

16ft

Pg. 22 Mechanical Code

20
Q

What is the ventilation rate for people only, in cubic feet per hour for a 5000sqft general office building when using the 2018 NCMC?

A 
7500cfh
5people/1000sqft
5cfm/person
5people x 5 = 25 people
25 people x 5cfm = 125cfm
125cfm x 60min/hr = 7500cfh
Pg. 35 Mechanical Code
21
Q

Copper tubing used for refrigerant piping in field-erected systems shall be made of copper tubing either hard or annealed. What is the largest size of annealed tubing allowed by the code?

A

2in outside diameter

Pg. 108 Mechanical Code

22
Q

Per the 2018 NCMC, which of the following is an approved procedure for commercial duct design?

  • ASHRAE Handbook of HVAC Applications
  • ACCA Manual D
  • ASHRAE Handbook of Fundamentals
  • ACCA Manual Q
A

ASHRAE Handbook of Fundamentals

Pg. 70 Mechanical Code

23
Q

The largest sized annealed copper tubing allowed to be connected with a mechanical fitting is?

A

7/8in

Pg. 108 Mechanical Code

24
Q

The code requires which the following for air filter locations?

  • Inside the building
  • Upstream from heat exchangers and coils
  • Near the coldest air in the structure for heating applications
  • On each floor served by the system
A

Upstream from heat exchangers and coils.

Pg. 73 Mechanical Code

25
Q

Two 1200cfm air handlers are installed on a common duct system and designed to operate simultaneously, does the code require these air handlers to be controlled and protected by duct mounted smoke detectors?

A

Yes, smoke detectors shall be installed in return air systems with a design capacity of over 2000cfm.
Pg. 74 Mechanical Code

26
Q

The passageway requirements for a furnace located in a crawlspace is?

A

22in high x 36in wide x 20ft long

Pg. 22 Mechanical Code

27
Q

Duct liners shall not support the spread of flames and must have a flame spread index of not more than _______.

A

25

Pg. 73 Mechanical Code

28
Q

Carbon steel pipe of schedule 40 shall be used for Group A1 and Group B1 refrigerants for lines 6in and smaller. What refrigerant groups can use this pipe material for liquid lines between 2in and 6in and all suction and discharge lines 6in and smaller.

A

A2, A3, B2, or B3

Pg. 108 Mechanical Code

29
Q

Cooling towers and fluid coolers shall be provided with ___________.

A

Ready Access

Pg. 90 Mechanical Code

30
Q

Fire dampers shall be installed in accordance with the 2018 NCMC and the 2018 North Carolina Building Code. The correct location of dampers on the building plans is the responsibility of ________.

A

The Designer

Pg. 76 Mechanical Code

31
Q

What is the minimum size copper tubing fuel-oil supply line?

A

3/8in ID

Pg. 120 Mechanical Code

32
Q

For other than the testing of a ground source heat pump loop system, the minimum duration of the test of a hydronic piping system shall be _______ minutes.

A

15

Pg. 118 Mechanical Code

33
Q

In general, a grease duct system serving a Type 1 hood shall have a minimum clearance of _______ inches from gypsum board wall board attached to noncombustible structures.

A

3in

Pg. 51 Mechanical Code

34
Q

Floor registers shall resist without structural failure a _____lb concentrated load on a 2in diameter disc applied to the most critical area of the exposed face.

A

200

Pg. 72 Mechanical Code

35
Q

When sizing a closed-type expansion tank, which of the following criteria is not required?

  • Average operating temperature
  • Fill pressure
  • Atmospheric pressure
  • Minimum operating pressure
A

Minimum operating pressure

Pg. 97 Mechanical Code

36
Q

Where PB piping is installed vertically in a hydronic piping system, it shall be supported at maximum intervals of ________.

A

4ft.

Pg. 21 Mechanical Code

37
Q

All refrigeration systems containing more than ______ refrigerant in systems using positive displacement compressors shall have stop valves installed.

A

6.6lbs

Pg. 109 Mechanical Code

38
Q

Steam blow-off valves shall discharge to __________.

A

a safe place of disposal.

Pg. 97 Mechanical Code

NC H3 Technical & Business Law (11 decks)

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