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Heating > Review 3 > Flashcards

Review 3 Flashcards

1
Q
  1. Natural gas and propane are
A

(b is the correct answer) Member of the hydrocarbon (b is correct)

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2
Q
  1. What is the odorant added to natural gas and propane
A

(A is Correct answer) mercaptan

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3
Q
  1. What is the odorant added to natural gas and propane
A

(A is Correct answer) mercaptan

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4
Q
  1. Which of the following statements regarding the odorant added to natural gas is correct?
A

(D is correct answer) the odorant added to natural gas tends to fade and fall out of suspension.

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5
Q
  1. 85 % of natural gas is composed of
A

(B is the correct answer) methane

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6
Q
  1. Identify the chemical formula for the following elements and compounds:
A

a) Methane CH4
b) Propane C3H8
c) Oxygen O2
d) Nitrogen n2
e) Water H2O
f) Carbon Dioxide CO2
g) Carbon monoxide CO

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7
Q
  1. The approximate percentage of oxygen and nitrogen in air is
A

(B is correct) 21 % Oxygen and 79 % Nitrogen

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8
Q
  1. Fill in the values concerning the properties of natural gas
A

a) Lower and upper limit of flammability: 405 % to 15 % of gas in air
b) Approximately ignition temperature: 1200 to 1300 F or 650 to 700 c
c) Heating value: 1000 Btus per cubic foot
d) Relative density or specific gravity as gas 0.6
e) Flame speed: 12inch per second
f) Expansion rate from liquid to gas 600

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9
Q
  1. Fill in the values concerning the properties of propane
A

a) Lower and upper limit of flammability 24 % to 9.5 % of gas in air
b) Expansion rate form liquid to gas 270 %
c) Heating value 2500 Btus per cubic foot
d) Relative density or specific gravity as a gas 1. 52
e) Flame speed 32” / second

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10
Q
  1. Which of the following statements is true concerning propane
A

(a is the correct answer) propane liquid escaping form a container rapidly drops in temperature.

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11
Q
  1. Provide the full wording for the following acronyms:
A

a) L.EL Lower explosive limit
b) U.F.L Upper flammability lime
c) U.E.L Upper explosive limit
d) L.F.L Lower flammability limit

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12
Q
  1. What is L.E.L.?
A

(b is the correct answer) The lowest percent of gas in the air-gas mixture will support combustion.

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13
Q
  1. Odorant is added to natural gas at the:
A

(a is the correct answer) city gate

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14
Q
  1. Pipelines delivering gas to the end user are known as:
A

(b is the correct answer) distribution pipelines

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15
Q
  1. The maximum flame temperature from the combustion of natural gas with air is
A

Answer: 3500 F or 1925 c

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16
Q
  1. This maximum flame temperature will be achieved when the level of oxygen in the
A

flue gases is 0 % and the level of carbon monoxide is 0 % ppm

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17
Q
  1. The two main hydrocarbons which form natural gas are:
A

(a is the correct answer) methane and ethane

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18
Q
  1. What is a “Btu”?
A

(b is the correct answer) British thermal unit

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19
Q
A
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20
Q
  1. The boiling point of propane is:
A

(C is the correct answer) -44° F (-42° C)

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21
Q
  1. The boiling point of natural gas is:
A

(c is the correct answer) -44° F (-42° C)

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22
Q
  1. What is the ignition temperature of propane gas compared to natural gas?
A

(b is the correct answer) lower or propane

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23
Q
  1. Which of the following statements is correct concerning the heating value of equal volumes of propane compared to natural gas?
A

(c is the correct answer) Propane has 2 ½ times more heating value than natural gas

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24
Q
  1. Natural Gas is_______ than air and propane is_________ than air
A

(c is the correct answer) lighter, Heav

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25
Q
  1. One imperial gallon of propane weighs:
A

(c is the correct answer) 5.1 pounds (2.3 kilograms)

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26
Q
  1. At 60°F (15.5° C) a pound of propane produces how many cubic feet of gas?
A

(c is correct) 8.50

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27
Q
  1. Propane shall have a distinctive odour content to ensure it is readily detectable
A

(b is correct) 20% of the lower explosive limit.

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28
Q
  1. When one pound of propane burns, it releases approximately:
A

(c is correct) 2,500 Btu.

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29
Q
  1. The relative density of liquid propane as compared to water is approximately
A

(a is the correct answer) 0.5

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30
Q
  1. Propane is a:
A

hydrocarbon

31
Q
  1. the propane:
A

As the temperature of liquid propane in a tank increases, the vapor pressure of
(a is the correct answer) increases

32
Q
  1. one boiler horsepower is approximately
A

(c is the correct answer) 24000 Btu (10 kw)

33
Q
A
34
Q
A
35
Q
  1. The “specific gravity of a gas (vapor” is:
A

(b is the correct answer) the weight of the gas as compared to the weight of an equal volume of air.

36
Q
  1. Define combustion?
A

Answer: Rapid oxidization of fuel creating heat and light

37
Q
  1. name the three elements required for the combustion of any fuel.
A

Answer: Fuel, Air, ( or oxygen) initiation heat

38
Q
  1. which one of the three elements would be the easiest to control or eliminate in a leak situation (before a fire occurs) and what steps must be taken to safely eliminate this element?
A

Answer: fuel off the gas supply at a manual valve and ventilate naturally

39
Q
  1. perfect combustion is theoretically achieved when the level of oxygen in flue gases is 0 % and the level of carbon monoxide is 0% ppm
A

40 name the three types of combustion

40
Q

40 name the three types of combustion

A

Answer: perfect, complete, and incomplete

41
Q
  1. the products of perfect combustion of natural gas or propane with oxygen are
A

(a is the correct answer) water vapor, carbon dioxide, heat, and light

42
Q
  1. what air to gas ratio is required for the complete combustion of natural gas
A

(b is the correct answer) 10 parts of air to 1 part of gas

43
Q
  1. what air to gas ratio is required for the complete combustion of propane
A

(d is the correct answer) 24 parts of air to 1 part of gas

44
Q
  1. Air that is mixed with fuel prior to ignition is called
A

(a is correct answer) Primary air

45
Q

45 Air that is mixed with fuel at the point of combustion and around the flame is called

A

(b is the correct answer secondary air

46
Q
  1. What is excess air
A

(b is correct answer) air in the combustion zone in addition to that which is required for combustion.

47
Q
  1. A long, yellow flame on an atmospheric burner is caused by:
A

(b is the correct answer) not premixing air and fuel prior to combustion

48
Q
  1. smoke in the flue gases may indicate that
A

(b is the correct answer) incomplete combustion is occurring.

49
Q
  1. the flue gases from the complete combustion of natural gas in air are primarily
A

(c is the correct answer) Carbon dioxide, water vapour, nitrogen, excess air, heat, and light

50
Q
A
51
Q
A
52
Q
  1. Which of the following is toxic
A

(d is the correct answer) Carbon monoxide.

53
Q
  1. Two undesirable products of incomplete combustion are:
A

(a is the correct answer) Carbon monoxide and aldehydes

54
Q
  1. which one of the following phrases refers to the air found in the products of combustion after the complete combustion of natural gas or propane?
A

(c is the correct answer) excess air.

55
Q

55 Carbon dioxide and nitrogen are:

A

(b is the correct answer) inert gases

56
Q
  1. which one of the following substances is inert and passes through the combustion zone absorbing heat during the combustion process.
A

(d is the correct answer) nitrogen

57
Q
  1. what is the approximate dew point of the water vapor in combustion gases produced by a properly setup appliance?
A

(a is the correct answer) 130 F (54 C)

58
Q
  1. What problem (if any) occur if the dew point of the water vapour in combustion gases is reached in the appliance or venting system?
A

Any reasonable and thoughtful answer that recognizes the corrosive.

59
Q
  1. Carbon gas which is non- toxic.
A

(b is correct answer) Hydrocarbon fuels.

60
Q
  1. a blue flame is a reliable indicator of complete and efficient combustion
A

The answer is true.

61
Q
A
62
Q
  1. Air supply to a gas-fired appliance includes:
A

( d is correct answer) All of the listed choices

63
Q
  1. If the air shutters on an atmospheric burner become plugged with dirt, the flame may:
A

(c is correct answer) appear yellow and long

64
Q
  1. A properly set up Bunsen burner flame is
A

(a is the correct answer) blue

65
Q
  1. If an atmospheric burner is supplied with too much primary air, the result may be:
A

(b is the correct answer) a lifting flame

66
Q
  1. What effect could negative pressure in a building have on the venting of an appliance?
A

(a is the correct answer) It may cause a downdraft condition at appliances.

67
Q
  1. Negative pressure in a building is caused by:
A

(d is the correct answer) lack of makeup air or combustion air

68
Q
A

(d is the correct answer) 30 parts air to 1 part gas

69
Q

69 What is the approximate total air volume supply required compared to gas input for a natural gas-fired atmospheric burner on an appliance equipped with a draft hood?

A

(d is the correct answer) 30 parts air to 1 part gas

70
Q
  1. How much combustion air is required to burn 10 cubic feet (283 cu. M.) of natural gas?
A

(a is the correct answer) 100 cu. Ft. (2.83 cu. M)

71
Q

7.1 what is the normal percentage of combustion air to excess air requirements for an atmospheric burner?

A

The answer is: that excess air is usually an additional 50 % of that required for combustion.

72
Q
  1. list four possible causes of incomplete combustion, other than lack of air.
A

1 may include
2 flam quenching
3 blocked venting, negative building pressure

73
Q
  1. Which of the following statements is NOT correct regarding excess air in the combustion process?
A

(c is the correct answer) excess

74
Q

What is the most common cause of orange flashes in a flame?

A

(d is the correct answer) dust or dirt

Heating (3 decks)

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