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Heating Theory [FINALIZED!] > [D2L] Midterm > Flashcards

[D2L] Midterm Flashcards

1
Q

How many BTU’s in any kind of residential, commercial, or industrial gas system, including any gas appliance does a (B) gas fitter adhere to?

A

Does not exceed 400,000 BTU

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2
Q

What combustible component of natural gas is typically 95%?

A

methane

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3
Q

What are oil, natural gas and coal classed as?

A

hydrocarbon

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4
Q

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

A

True

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5
Q

How many BTU’s are required to heat a 40Gal HWT from 55F to 130F

A

30,000

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6
Q

What range is the operating pressures of transmission pipe lines?

A

300 psi - 1500 psi

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7
Q

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

A

mercaptan

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8
Q

What does LPG stand for?

A

Liquefied Petroleum Gas

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9
Q

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

A

-258 F

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10
Q

What is the boiling point of propane at atmospheric pressure?

A

-44 F

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11
Q

What is the natural state of natural gas?

A

gas

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12
Q

What is the heating value of natural gas?

A

1000 btu/cubic foot

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13
Q

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

A

24 cubic feet

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14
Q

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

A

11” wc

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15
Q

Each atom of natural gas (methane) is made up of carbon and __________.

A

hydrogen

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16
Q

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

A

12 - 80 psig

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17
Q

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

A

CSA-B149.1

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18
Q

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?

A

Carbon dioxide

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19
Q

How many cubic feet of natural gas are required to produce 400,000 btu?

A

400

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20
Q

How much combustion air would be required for perfect combustion of 250,000 btu of natural gas?

A

2500 cubic feet

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21
Q

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

A

15 psi for 15 minutes

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22
Q

An “A” gasfitter can work on

A

Appliances and Piping downstream of the gas meter

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23
Q

What is natural gases range of flammability?

A

5% to 15%

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24
Q

What is the chemical formula for natural gas?

A

CH4

25
Q

Is natural gas lighter or heavier than air?

A

Lighter

26
Q

Propane gas, as a vapour, has a relative density of 1.5 lb/ft³. Is it heavier or lighter than air?

A

Heavier

27
Q

What is the structure of a molecule of Propane?

A

Three carbon atoms and eight hydrogen atoms

28
Q

The Maximum Flame Temperature for Nat. Gas is 1000F

A

False

29
Q

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

A

3”

30
Q

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

A

Between the meter and the appliance with no gas flowing

31
Q

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

A

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

32
Q

What are the manifold pressures for natural gas and propane?

A

Natural Gas is 3.5”wc and propane is 11.0”wc.

33
Q

1,000,000(1) -> 100,000
100,000(4) -> 40,000
10,000(7) -> 7,000
1,000(5) -> 500

A

147,500

34
Q

A ¼ cubic foot test dial on a gas meter takes 52 seconds to travel 1 revolution. What is the gas flow rate?

A

17.3 CFH

35
Q

What is the heating value for natural gas being supplied at a rate of 24.7 CFH?

A

24,700.0 BTU/Hr

36
Q

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

A

Control the amount of primary air entering the burner.

37
Q

What is the purpose of aldehydes?

A

Nothing; they are a product of incomplete combustion and means carbon monoxide is likely present

38
Q

What are the three components of the combustion triangle?

A

Air, fuel and heat

39
Q

What would cause a roaring and lifting flame?

A

Too much primary air

40
Q

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

A

Colour, shape and size.

41
Q

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

A

7”-14” wc

42
Q

How many cubic feet of propane gas is required to produce 350,000 BTU?

A

140

43
Q

What pressure is finish piping tested to?

A

working pressure

44
Q

How much is 1 psig equal to?

A

28” wc

45
Q

Vent gases “exhaust Gas” from mid efficient furnace are made up of:

A

Dilution Air and Flue Gases

46
Q

Excess Air is what percent of Theoretical Air?

A

40%

47
Q

In an non-aerated burner, the gas is supplied for combustion without being mixed with air prior to ignition

A

True

48
Q

In a Power burner, gas is only supplied after what has happened?

A

Air supply is proven

49
Q

How much does 10 Imp Gal of water weight?

A

100 lbs

50
Q

How many hours will it take for 2000 cubic feet of propane to operate a construction heater with a rated input of 40 000 Btu per hour, if the heater operated continuously?

A

125

51
Q

A furnace with a rated input of 60,000 BTUs runs for 6hrs and is 80% efficient, how many BTUs of heat does it produce?

A

288,000 BTU’s

52
Q

A furnace with a rated input of 60,000 BTUs runs for 6hrs and is 80% efficient, how many cuft of Natural gas did it burn?

A
53
Q

A Propane furnace with a rated input of 60,000 BTUs runs for 6hrs and is 80% efficient, how many Cuft of Theoretical Air did it burn?

A
54
Q

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

A

the gas produces acid rain when burned

55
Q

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

A

270x

56
Q

What is the highest level of GAS Fitter?

A

Gas Fitter A

57
Q

Ignition Temperature of CH4

A

1200f

58
Q

Flame speed of Propane?

A

32 inches/second

Heating Theory [FINALIZED!] (11 decks)

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