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CMC Test Preperation > Fuel Gas Code > Flashcards

Fuel Gas Code Flashcards

0
Q

The notch for gas piping is located 5’ from the edge of a 2x12 joist. The joist is 12’ long. The notch is on the bottom. What is the maximum height of the notch. (1-1/2”, 2”, 3” or may not be located here)

A

May not be located here

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1
Q

What is the minimum distance a notch can be made on the edge of a stud before a shield plater is required? (1/2”, 1”, 1-1/2”, or 2”)

A

1”

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2
Q

Gas pipe shall not be ben though an arc greater than…

A

90 Degrees

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3
Q

Minimum test pressure for gas pipe is…

A

3 psi

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4
Q

Which method cannot be used for joints in plastic fuel gas pipe?

A

Threaded

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5
Q

Which of the following shall not be used for joints on metallic gas pipe?

A

Soldered

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6
Q

Vent connectors located in attics must be…

A

Type B or L vents

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7
Q

On a 3” gas line, a pressure tap must be installed a minimum of how far from an MP regulator? (24”, 30”, 36” or 42”)

A

30”

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8
Q

What is a good cleaner for removing scale from a water cooled condenser? (Iso Alcohol, Sodium Thiosulfate, Nitrogen and Muriatic Acid)

A

Muriatic Acid

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9
Q

Compressor runs constantly on ac system. Most likely cause is…
(low refrigerant, excessive refrigerant, low voltage or open thermostat)

A

Low refrigerant

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10
Q

What is the equivalent length of pipe in feet for two 6” 45’s and one 6’ gate valve? (6’,17’, 21’ or 29’)

A

17’

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11
Q

Vessel with open top is considered confined space if it is atleast how many feet deep (2, 4, 6, 8)

A

4’

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12
Q

What is the minimum number of openings communicating with outside air required to ventilate a confined space where a gas appliance has a clearance of 1”on both sides and the back and 6” in the front?

A

1

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13
Q

A gas fired unit heater in a warehouse must have how much clearance from the wall?

A

18”

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14
Q

When installing a recirculation direct-fired industrial air heater, what provisions must be made? (Ductwork, Make up water, Relief air vent)

A

Relief air vent

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15
Q

Gas vent terminates through roof with a 12/12 pitch, not at peak of roof. What is the minimum height from the roof to the lowest discharge opening?

A

4 FT

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16
Q

What is the smallest pipe that can be used on a 165’ piping system designed to carry 900 CFH of gas at 1 PSI and 1/2” water column?

A

2-1/2”

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17
Q

What is the appropriate size vent for a category one 125,000BTU appliance with Type B double wall vent if using for natural draft with a height of 15FT and a lateral run of 2FT.

A

5”

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18
Q

A fan assisted 125,000BTU appliance is placed into a room with 65,000BTU natural draft water heater. What is the common “Type B” vent size required if the vent is 23FT high?

A

5”

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19
Q

How far should the unthreaded portion of piping outlets extend through the floors?

A

2”

20
Q

2x12 Joist Question

  1. 1 1/2
  2. 1 3/8
  3. 2 1/8
  4. 0
A

0”

21
Q

2” x 6” question

  1. 1 1/2
  2. 1 3/8
  3. 2 1/8
  4. 2 1/8
A

1 3/8

22
Q

1 CFH = 1000 BTUs

So if BTUs are 100,000, the CFH would be 100
What is CFH for 60,000 BTUs?

A

60

23
Q

What is EHD?

A

Equivalent Hydraulic Diameter

24
Q

Plastic tubings and fittings should run on top or underneath the ground?

A

Underneath the ground only

25
Q

What is a quick closing valve?

A

Ball valve

26
Q

Regarding gas piping, shield plates shall be a minimum of _____ inch thick steel and shall cover the area of the pipe where wood member is notched or bored.

A

1/16 thick

27
Q

In concealed locations, where piping and other than black or galvanized steel is installed through holes or notches of wood studs, joists, rafters or similar members less than ___.___ inches from the nearest edge of the member, the pipe shall be protected by a shield plate.

A

1.5 inches

28
Q

Plastic piping joints and fittings for use in liquefied petroleum gas piping systems shall be in accordance with __.__.__.__. 58

A

NFPA (National Fire Protection Agency) 58

29
Q

In the case of cast iron fittings,

flangers are ok?
bushings are ok?

A

Flangers are ok

Bushings are not ok

30
Q

Cast iron can be used for gas piping.

true or false

A

False

31
Q

The operating pressure for undiluted LP gas systems shall not exceed ______psi.

A

20 PSI

32
Q

The maximum design operating pressure for piping systems located inside buildings shall not exceed _____ lbs per square inch gauge. One exception being if the piping system is ___________.

A

5 lbs per square inch

welded

33
Q

For other than steel pipe, exposed piping shall be identified by a yellow label marked “Gas” in black letters. The marking shall be spaced at intervals not exceeding ______ Ft.

A

5 ft

34
Q

In no case shall the edge of the bored hole be nearer than _____” to the edge of the stud.

A

5/8 inch

35
Q

Bored holes not greater than ______% of the depth of the stud are permitted in non-load bearing partitions or in any wall where each bored stud is doubled.

A

60%

36
Q

Cutting or notching of studs to a depth greater than _____% of the width of the stud is permitted in non-load bearing walls supporting no weight other than the weight of the partition.

A

40%

37
Q

A hole not greater than _____% of the stud depth is permitted to be bored in any wood stud.

A

40%

38
Q

In exterior walls and bearing petitions, any wood stud is permitted to be cut or notched to a depth not exceeding ______% of it’s width.

A

25%

39
Q

Notches in the top or bottom of the joist shall not exceed 1/__ of the depth and shall not be located in the middle 1/__ of the span.

A

1/6

1/3

40
Q

The maximum horizontal length of a single wall connector shall be _____% of the height of the chimney or vent.

A

75%

41
Q

Where vents pass through attic space, an insulation shield shall terminate not less than _____” above the insulation materials.

A

2”

42
Q

Connectors shall connect to a masonry chimney flue at a point not less than _____ inches above the lowest point of the interior of the chimney flue.

A

12”

43
Q

Appliance connectors shall have a maximum _____Ft in overall length, except for range and domestic clothes dryer connections, which shall not exceed ____Ft in overall length.

A

3 Ft

6 Ft

44
Q

Regarding gas pipe and MP regulators, a tee fitting with one opening capped or plugged shall be installed not less than ______ pipe diameters downstream of the MP regulator outlet.

A

10

45
Q

An appliance gas shut off valve shall be located in the same room as the appliance, not further than _____Ft from the appliance.

A

6 Ft

46
Q

The test duration shall be not less than _____ hr for each ______ Ft.

A

1/2 hr for each 500 ft

47
Q

The test medium shall be air, nitrogen, carbon dioxide or an inert gas. ___________ shall not be used.

A

Oxygen

48
Q

Regarding plastic piping, the radius of the inner curve of such bends shall not be less than _______ times the inside diameter of the pipe.

A

25 Times

CMC Test Preperation (10 decks)

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