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book 1 - 5th power engineering > chapter 13 > Flashcards

chapter 13 Flashcards

1
Q

Low excess combustion air in a boiler will likely cause:

a) soot
b) high CO2
c) spalling
d) puffback

A

a

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2
Q

The combustible components of coal are:

a) Carbon, hydrogen, nitrogen
b) Carbon, hydrogen, sulphur
c) Carbon, hydrogen
d) Carbon, hydrogen, oxygen

A

b

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3
Q

Modern flue gas analyzers measure the amount of _____________ in flue gases.

a)Carbon dioxide, carbon monoxide, flue temperature
b)Carbon dioxide, carbon monoxide, oxygen
c)Carbon dioxide
d)Carbon, carbon monoxide, nitrogen

A

b

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4
Q

Fuel oils are derived from:

a)Natural gas
b)Petroleum
c)Coal
d)Electricity

A

b

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5
Q

To find draft in a boiler, measure the difference between the furnace pressure and _______________ pressure.

a)Atmospheric
b)Steam
c)Dynamic
d)Blower

A

a

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6
Q

Carbon monoxide in the flue gas is a sign of

a)complete combustion
b)incomplete combustion
c)stoichiometric combustion
d)perfect combustion

A

b

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7
Q

The device for measuring draft is called:

a)Barometer
b)Diaphragm
c)Bourdon tube
d)Manometer

A

d

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8
Q

A draft diverter:

a)Maintains constant pressure through the forced draft fan
b)Maintains constant furnace temperature for combustion
c)Maintains a constant and limited draft for combustion on natural draft burner
d)Maintains constant chimney temperature

A

c

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9
Q

The windbox is:

a) Another name for the chimney
b) The space at the rear tubesheet of a firebox boiler where flue gases turn to make the next succeeding pass
c) The box around the burner damper that collects the output from the blower
d) The box at the last pass of the boiler that collects flue gases and funnels them toward the chimney

A

c

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10
Q

Draft

a) Is the movement of air from a high pressure region to a low pressure region
b) Depends on the difference in density between the boiler’s exiting flue gases and the entering combustion air
c) Would increase if the height of the chimney were to be increased
d) a) and c)
e) All of the above

A

e

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11
Q

The Inclined Draft Gauge offers this advantage over the U-tube draft gauge:

a)Measures slight pressure fluctuations more accurately
b) Smaller
c) Does not require to be level to be accurate
d) All of the above

A

a

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12
Q

In the SI system of units, draft is typically measured in:

a) Millimetres of water column
b) kPa
c) Feet of head
d) psi

A

a

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13
Q

In order to produce a continuous flow of air and gas through the boiler a __________ is required

a) specific gravity difference
b) pressure difference
c) velocity difference
d) temperature difference

A

b

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14
Q

___________ is the most widely used oil for packaged firetube boilers

a) #5 Fuel Oil
b) #2 Fuel Oil
c) Bunker C
d) Kerosene

A

b

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15
Q

Conditions for complete combustion include ________________.
a) Thorough mixing of water and fuel
b) Cool heating surfaces
c) Enough air
d) Low furnace temperature

A

c

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16
Q

The spark electrodes that ignites the burner pilot are typically:

a) 24 V
b) 120 V
c) 10,000 - 12,000 V
d) 10,000 - 12,000 A

A

c

17
Q

Low excess combustion air in a boiler will likely cause:

a) puffback
b) spalling
c) soot
d) high CO2

A

c

18
Q

The forced draft fan is used to force:

A.Combustion air into the furnace
B.Combustion air into the stack
C.Flue gases into the stack
D.Flue gases into the furnace
E.Combustion produces into the stack

A

a

19
Q

One inch of water is equivalent to:

A.14.7 psi (101.4 kPa)
B.0.145 psi (1.0 kPa)
C.0.36 psi (2.46 kPa)
D.0.00014 psi (0.0009 Pa)
E.0.036 psi (0.25 kPa)

A

e

20
Q

The draft created by the fan can be controlled by the:

A.Use of inlet dampers
B.Speed of the dampers
C.Temperature of the flue gases
D.Height of the stack
E.Amount of fuel supplied

A

a

21
Q

The term Relative Density (specific gravity) means:

A.The ratio of the mass of a certain volume of oil to the mass of an equal mass of oil
B.The ratio of the volume of a certain mass of oil to the mass of an equal volume of water
C.The ratio of the mass of a certain volume of oil to the volume of an equal mass of water
D.The ratio of the mass of a certain volume of oil to the mass of an equal volume of water
E.The ratio of the mass of a certain volume of water to the mass of an equal volume of water

A

d

22
Q

A U-tube draft gauge is also known as a:

A.Manometer
B.Viscometer
C.Psychrometer
D.Pressure gauge
E.Thermometer

A

a

23
Q

In buildings the fuels that are widely used are:
1. Oil
2. Coal
3. Natural gas
4. Hog fuel
5. Garbage

A.2, 3, 5
B.1, 2
C.1, 2, 3
D.2, 4
E.1, 3

A

e

24
Q

Propane as a liquid takes as little as _____ of the space it needs as a gas, making it easy to store and transport and then burn as a gas.

A.1/150th
B.1/12th
C.1/120th
D.1/10th
E.1/100th

A

c

25
Q

Air is composed of mostly:

A.Oxygen
B.Helium
C.Nitrogen
D.Smog
E.Carbon dioxide

A

c

26
Q

The amount of air in excess of the theoretical air 12 kg (26.5 lb) is 6 kg (13.2 lb) expressed as a percentage of the theoretical air this would be:

A.30%
B.20%
C.10%
D.15%
E.50%

A

e

27
Q

If the combustion is complete the carbon will combine with the oxygen to produce _____ plus heat.

A.Sulphur monoxide
B.Carbon monoxide
C.Sulphur dioxide
D.Water vapour
E.Carbon dioxide

A

e

28
Q

the incomplete combustion of carbon results in the formation of carbon ____________

a. terachloride
b. monoxide
c. dioxide
d.trioxide

A

b

29
Q

when a unit amount of fuel is burned completley, the heat produced is called the __________of the fuel

a. heat content
b. heating value
c. excess air
d. combustion efficiency

A

b

30
Q

the conditions for complete combustion include

a. low furnace temp
b. cool heating surfaces
c. thorough mixing of water and fuel
d. enough air

A

d

31
Q

the amount of air required to supply just enough oxygen for complete combustion is called _______ air

a. excess
b. theoretical
c. tertiary
d. primary

A

b

32
Q

_________ forms the greatest percentage of the combustible elements in fuel

a. sulfur
b. hydrogen
c. carbon
d. wood

A

c

33
Q

an advantage of using natural gas as fuel is

a. more storage space is required
b. has less heating value than oil
c. less expensive than coal
d. easily mixed with air

A

d

34
Q

a draft system that is motorized and mounted on the front of the boiler is ___________ draft

a. natural
b. forced
c. induced
d. balanced

A

b

35
Q

a pressure explosion of a boiler may occur if

a. the gas pressure to the burner is too high
b. feedwater pressure is too high
c. low boiler water level produces weakening of tubes
d. the safety valve opens too early

A

c

book 1 - 5th power engineering (20 decks)

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