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3A2 > 3A2 Chapter 03 > Flashcards

3A2 Chapter 03 Flashcards

1
Q

Calculate the heating value of a fuel with the following ultimate analysis:

1) carbon 62% (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: caloric value = 33.7 C + 144(H-O2/8) + 9.3S

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

Calculate the heating value of a fuel with the following ultimate analysis:

1) carbon 60.0% (0.60kg/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 = 33.7C + 144(H-O2/8) + 9.3S

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

Calculate the heating value of a fuel with the following ultimate analysis:

1) carbon 68%
2) hydrogen 4%
3) sulphur 0.75%
4) ash 9.5%
5) oxygen 18.5%
6) nitrogen 2.0%

Using the formula: calorific value = 33.7C + 144(H-O2/8) + 9.3S

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

Calculate the heating value of a fuel with the following ultimate analysis:

1) carbon 65.0%
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 = 33.7C + 144(H-O2/8) + 9.3S

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

Calculate the heating value of a fuel with the following ultimate analysis:

1) carbon 50.0%
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 = 33.7C +144(H-O2/8) +9.3S

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

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

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

Viscosity of fuel oil decreases as the temperature increases and becomes nearly constant, above 120 degrees C

A) true
B) false

A

A) true

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9
Q

The viscosity is the time, in _____, for 60 cubic cm of oil to refrigeration through an orifice, at 38 degrees C

A) minutes
B) seconds
C) hours
D) days

A

B) seconds

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10
Q

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

One advantage of natural gas firing is, the clean burning, no ash is produced to leave deposits. The heating surfaces

A) true
B) false

A

A) true

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12
Q

The heating value of natural gas will vary according to its _____

A) colour
B) constituents
C) weight
D) volume

A

B) constituents

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13
Q

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

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

The heating value of dry wood bark is about 50,000 KJ/kg

A) true
B) false

A

B) false

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16
Q

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

17
Q

The process of non-catalytic removal of NOx, is the addition of ammonia to the flue gas

A) true
B) false

A

A) true

18
Q

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

19
Q

NOx removal catalyst used is a base metal compound, such as iron, lead, or silver

A) true
B) false

A

A) true

20
Q

A fluidized bed of limestone, will not only reduce nitrous oxides but will also significantly reduce sulphur dioxide emissions by the combination of sulphur dioxides with the limestone

A) true
B) false

A

A) true

21
Q

Electrostatic precipitators have an efficiency of greater than 95%

A) true
B) false

A

A) true

3A2 (15 decks)

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