Heating Final

Question 1

What can a Gas Fitter B work on

Answer 1

Up to 400,000BTU

Question 2

What combustible component of natural gas is typically 95%?

Answer 2

Methane

Question 3

What are NG, Oil and Classed as?

Answer 3

Hydrocarbon

Question 4

All gas contains water, which must be removed at the wellhead because it would freeze forming “hydrates”.

Answer 4

True statment

Question 5

What range is the operating pressures of transmission pipe lines?

Answer 5

300-1500PSI

Question 6

Which substance is added to natural gas to provide its odor?

Answer 6

Mercaptan

Question 7

What does LPG stand for?

Answer 7

Liquified Petroleum Gas

Question 8

What temperature does natural gas need to be at atmospheric pressure need to be in order to liquefy?

Answer 8

-258f

Question 9

What is the boiling point of propane at atmospheric pressure?

Answer 9

-44 f

Question 10

What is the heating value of natural gas?

Answer 10

1000 btu/cubic foot

Question 11

How much combustion air is needed for perfect combustion of one cubic foot of propane?

Answer 11

24 cubic feet

Question 12

Regulators of propane tanks drop the pressure between 5-10psi. What pressure does the home regulator reduce the pressure to?

Answer 12

11” wc

Question 13

What pressure is gas distributed in most areas of the city?

Answer 13

12-80 psi

Question 14

What is the Canadian Natural Gas and Propane installation code book?

Answer 14

CSA 149.1

Question 15

When gas burns properly, the hydrogen combines with the oxygen of the air to produce water vapour. What is produced when the carbon combines with the oxygen?

Answer 15

Carbon Dioxide

Question 16

What are the rough in piping pressure testing requirments for most residential piping systems (2 psi max pressure and less than 200 feet of piping)?

Answer 16

15 psi for 15 mins

Question 17

An “A” gasfitter can work on

Answer 17

Appliances and Piping downstream of the gas meter

Question 18

What is natural gases range of flammability?

Answer 18

5-15%

Question 19

What is the chemical formula for natural gas?

Answer 19

CH4

Question 20

Is natural gas lighter or heavier than air?

Answer 20

Lighter

Question 21

Propane gas, as a vapour, has a relative density of 1.5 Lb/Ft3. Is it heavier or lighter than air?

Answer 21

Heavier

Question 22

What is the structure of a molecule of Propane?

Answer 22

3 Carbon 8 Hydrogen

Question 23

The Maximum Flame Temperature for Nat. Gas is 1000F

Answer 23

False

Question 24

What is the min size of pressure gauge when pressure testing rough in piping?

Answer 24

3”

Question 25

Where and how is standing pressure obtained from a gas furnace system?

Answer 25

Between the meter and appliance with no gas flowing

Question 26

Where and how is manifold pressure obtained from a gas furnace system?

Answer 26

Between the appliance control valve and burner while the appliance is firing

Question 27

What are the manifold pressures for natural gas and propane?

Answer 27

3.5 NG 11 Propane Both “ wc

Question 28

What is the purpose of an air shutter on a mid efficient gas burner?

Answer 28

Control amount of primary air

Question 29

What is the purpose of aldehydes?

Answer 29

Nothing

Question 30

What are the three components of the combustion triangle?

Answer 30

Air, Fuel, Heat

Question 31

What would cause a roaring and lifting flame?

Answer 31

Too much primary air

Question 32

What are the three factors used to determine if a gas flame has the correct characteristics?

Answer 32

Colour, shape, size

Question 33

What pressure of natural gas is delivered from a service regulator to piping inside a home?

Answer 33

7-14”wc

Question 34

What pressure is finish piping tested to?

Answer 34

Working pressure

Question 35

How much is 1 psig equal to?

Answer 35

28”wc

Question 36

Vent gases are made up of:

Answer 36

Dilution Air and flue gasses

Question 37

How much does 1 Imp Gal of water weight?

Answer 37

10 lbs

Question 38

What happens if we don't remove Sulphur from gas?

Answer 38

Gas produces acid rain when burned

Question 39

Propane's volume increases by how much when changing from a liquid to a vapour?

Answer 39

270x