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3A2 > Ch. 3 > Flashcards

Ch. 3 Flashcards

1
Q
  1. Calculate the heating value of a fuel with the following ultimate analysis:
    1) Carbon 62.0% (0.62 kg/kg of fuel)
    2) Hydrogen 5.2%
    3) Sulphur 0.9 %
    4) Ash 9.5%
    5) Oxygen 19.0%
    6) Nitrogen 2.0%
    Using the formula: Calorific value = 33.7 C + 144 (H - O2/8) + 9.3 S
    a. 32 MJ/kg
    b. 25.03 MJ/kg
    c. 15.55 MJ/kg
    d. 50.26 MJ/kg
A

b. 25.03 MJ/kg

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2
Q
  1. Calculate the heating value of a fuel with the following ultimate analysis:
    1) Carbon 60.0% (0.60 kg/kg of fuel)
    2) Hydrogen 6.0%
    3) Sulphur 1.0 %
    4) Ash 9.5%
    5) Oxygen 20.0%
    6) Nitrogen 1.8%
    Using the formula: Calorific value =33.7 C + 144 (H - O2/8) + 9.3 S
    a. 25.35 MJ/kg
    b. 32.55 MJ/kg
    c. 19.25 MJ/kg
    d. 41.65 MJ/kg
A

a. 25.35 MJ/kg

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3
Q
  1. Calculate the heating value of a fuel with the following ultimate analysis:
    1) Carbon 68.0% (0.68 kg/kg of fuel)
    2) Hydrogen 4.0%
    3) Sulphur 0.75 %
    4) Ash 9.5%
    5) Oxygen 18.5%
    6) Nitrogen 2.0%
    Using the formula: Calorific value =33.7 C + 144 (H - O2/8) + 9.3 S
    a. 35.15 MJ/kg
    b. 41.55 MJ/kg
    c. 16.65 MJ/kg
    d. 25.43 MJ/kg
A

d. 25.43 MJ/kg

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4
Q
  1. Calculate the heating value of a fuel with the following ultimate analysis:
    1) Carbon 65.0% (0.65 kg/kg of fuel)
    2) Hydrogen 5.0%
    3) Sulphur 0.8 %
    4) Ash 9.5%
    5) Oxygen 21.0%
    6) Nitrogen 2.0%
    Using the formula: Calorific value =33.7 C + 144 (H - O2/8) + 9.3 S
    a. 30.56 MJ/kg
    b. 25.43 MJ/kg
    c. 51.25 MJ/kg
    d. 29.56 MJ/kg
A

b. 25.43 MJ/kg

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5
Q
  1. Calculate the heating value of a fuel with the following ultimate analysis:
    1) Carbon 50.0% (0.5 kg/kg of fuel)
    2) Hydrogen 10.0%
    3) Sulphur 1.2 %
    4) Ash 9.5%
    5) Oxygen 18.5%
    6) Nitrogen 2.0%
    Using the formula: Calorific value =33.7 C + 144 (H - O2/8) + 9.3 S
    a. 30.22 MJ/kg
    b. 35.23 MJ/kg
    c. 28.05 MJ/kg
    d. 52.22 MJ/kg
A

c. 28.05 MJ/kg

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6
Q
  1. Specific gravity is the ratio between the mass of a volume of oil, and is generally measured with a __________.
    a. dead weight tester
    b. thermometer
    c. hydrometer
    d. density meter
A

c. hydrometer

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7
Q
  1. The heating value of fuel oil, expressed as kJ/kg, varies inversely with the specific gravity. This is due to the fact that the hydrogen content decreases as the oil becomes lighter.
    a. True
    b. False
A

b. False

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8
Q
  1. Viscosity of fuel oil decreases as the temperature increases and becomes nearly constant, above 120°C.
    a. True
    b. False
A

a. True

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9
Q
  1. The viscosity is the time, in __________, for 60 cm3 of oil to run through an orifice, at 38°C.
    a. minutes
    b. seconds
    c. hours
    d. days
A

b. seconds

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10
Q
  1. A proper natural gas flame will be blue with a yellow tip.
    a. True
    b. False
A

a. True

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11
Q
  1. One advantage of natural gas firing is, the clean burning, no ash is produced to leave deposits on the heating surfaces.
    a. True
    b. False
A

a. True

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12
Q
  1. The heating value of natural gas will vary according to its __________.
    a. color
    b. constituents
    c. weight
    d. volume
A

b. constituents

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13
Q
  1. Biomass fuels are any fuel sources that are, or were, alive. Specific examples include grass, leaves, vines, coffee grounds and other waste products from the food industry.
    a. True
    b. False
A

a. True

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14
Q
  1. Municipal wastes generally contain large amounts of biomass material that may be suitable for use as a fuel.
    a. True
    b. False
A

a. True

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15
Q
  1. Fill in the blanks: The amount of NOX formed, can be controlled by: __________ the amount of excess air used in combustion and __________ the temperature in the combustion zone.
    a. Increasing, increasing
    b. Restricting, increasing
    c. Restricting, reducing
    d. Eliminating, increasing
A

c. Restricting, reducing

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15
Q
  1. The heating value of dry wood bark is about 50,000 kJ/kg.
    a. True
    b. False
A

b. False

16
Q
  1. The catalytic removal system requires injection of __________ in the presence of a __________.
    a. water, heat
    b. fuel, air
    c. lead, heat
    d. ammonia, catalyst
A

d. ammonia, catalyst

17
Q
  1. The process of non-catalytic removal of NOx, is the addition of ammonia to the flue gas.
    a. True
    b. False
A

a. True

17
Q
  1. A fluidized bed of limestone, will not only reduce nitrous oxides but will also significantly reduce sulphur dioxide emissions by the combination of sulphur dioxide with the limestone.
    a. True
    b. False
A

a. True

18
Q
  1. NOx removal catalyst used is a base metal compound, such as iron, lead, or silver.
    a. True
    b. False
A

a. True

19
Q
  1. Electrostatic precipitators have an efficiency of greater than 95%.
    a. True
    b. False
A

a. True

3A2 (15 decks)

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