Gas Piping

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Question 1

A drip leg should be installed

A	On the vertical gas line
B	On a horizontal line
C	Before the main gas shutoff
D	At the gas meter

Question 2

A manual gas cock valve shutoff should be installed at which part of the furnace?

A	Internal
B	External
C	At the main gas valve
D	At the gas meter

Question 3

A common pressure of ________WC is needed from the meter to the furnace when using natural gas.

A	3.5
B	9”
C	7”
D	11”

Question 4

A common pressure of________ WC is needed from the gas regulator to the burner orifices for natural gas.

A	3.5”
B	9”
C	7”
D	11”

Question 5

Liquefied petroleum gas (LPG) must maintain a pressure of_________WC from the regulator at the tank when it is being used

A	3.5”
B	9”
C	7”
D	11”

Question 6

______________refers to the relative weight of a gas as compared to the weight of an equal amount of air.

A	Specific gravity
B	Relative humidity
C	Specific heat
D	Density

Question 7

The specific gravity of natural gas is approximately

A	0.25
B	0.65
C	0.75
D	2.01

Question 8

To install or alter fuel gas piping

A	A license is always required to obtain a permit
B	A permit is required by most municipalities
C	A permit is not required by must municipalities
D	None of the above are true

Question 9

The gas supply line to a mobile home is commonly

A	¾”
B	½”
C	1”
D	1 ¼”

Question 10

The gas piping to supply mobile homes should be installed

A	At least 10” below grade
B	At least 12” below grade
C	At least 18” below grade
D	At least 16” below grade

Question 11

When installing gas pipe near structures such as porches, steps, breezeways, etc. gas pipe installations should be kept at least

A	4” above grade or structure
B	6” above grade or structure
C	8” above grade or structure
D	16” above grade or structure

Question 12

All gas piping must be

A	Vacuum tested
B	Tested with CO2
C	Tested with air pressure
D	Tested with oxygen

Question 13

Gas piping is commonly constructed of

A	Wrought iron
B	Steel
C	Black pipe
D	All of the above

Question 14

Gas piping that is not protected can be

A	At least 10” below grade
B	Embedded in 4” of cement
C	Embedded in 6” of cement
D	Installed above grade in recesses or channels that are approved

Question 15

Gas shutoff valves should be installed

A	6’ above floor level
B	8’ above floor level
C	On a horizontal pipe
D	Within 3’ of the appliance

Question 16

Leaks in gas piping should be located with

A	Nitrogen
B	Oxygen
C	A halide torch
D	A soapy solution

Question 17

All manual gas cock valves need to be

A	Constructed of brass
B	Approved for gas fuel only
C	Constructed of aluminum casting
D	Approved by GAMA

Question 18

Never use an open flame

A	While using a soap solution
B	To locate gas leaks
C	Around an electronic leak detector
D	Around a combustible leak detector

Question 19

Plastic gas piping should be

A	At least 18” below grade
B	At least 10” below grade
C	At least 12” below grade
D	At least 14” below grade

Question 20

Supports for hanging gas piping should be constructed of

A	Plastic straps
B	Thin wire
C	Copper hooks
D	Metal straps or hooks at approved intervals

Question 21

Underground gas piping that is ferrous and metallic should be at least

A	6” below grade
B	8” below grade
C	10” below grade
D	12” below grade

Question 22

Underground piping should be supported by

A	Compacted soil or sand
B	Concrete
C	Top soil
D	Gravel and soil

Question 23

Black iron pipe is used in areas where corrosion will not effect it, and the elements, and the elements that give the pipe its color is:

A	Copper
B	Carbon
C	Silver
D	The heat treating process gives the pipe its color

Question 24

When measuring black iron pipe, it is measured by its:

A	Outside diameter
B	Amount of threads per inch
C	Outside diameter and length
D	Nominal size

Question 25

A description of nominal size would be:

A	Outside diameter and length
B	Amount of threads per inch and diameter
C	An approximation of inside diameter for pipe up to 12" in length
D	An estimation of pipe weight per linear feet

Question 26

Pipe threads type are taper and straight and are classified by:

A	SMACNA
B	ACCA
C	BOCA Code
D	NPT

Question 27

Pipe thread compound is used on pipe threads for the purpose of:

A	Acting as a lubricant
B	Protecting the threads from corrosion
C	Acting as a lubricant and providing a seal
D	Protecting against contaminants within the gas

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Gas Piping

Gas Piping

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