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Boilers > Steam Boilers Module 15 Session 8 > Flashcards

Steam Boilers Module 15 Session 8 Flashcards

1
Q

Draft is measured in ____________.
A. Pounds per square inch
B. Inches or tenths of an inch of a vertical water column
C. Inches or tenths of an inch of mercury
D. Ounces per square inch

A

B. Inches or tenths of an inch of a vertical water column

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2
Q 
Draft in the boiler is measured between two points such as the \_\_\_\_\_\_\_\_\_\_\_\_ and \_\_\_\_\_\_\_\_\_\_\_\_.
A. Atmosphere; inside the boiler setting
B. Chimney; breeching
C. Breeching; firebox
D. Boiler’s first pass; chimney
A

B. Chimney; breeching

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3
Q 
A diaphragm draft gauge is calibrated in \_\_\_\_\_\_\_\_\_\_\_\_.
A. Pounds per square inch
B. Feet of water
C. Inches of water
D. Inches of mercury
A

C. Inches of water

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4
Q 
The amount of draft available in a natural draft system is dependent on the \_\_\_\_\_\_\_\_\_\_\_\_.
A. Diameter of the chimney
B. Height of the chimney
C. Fly ash in the gases of combustion
D. Types of fans used
A

B. Height of the chimney

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5
Q 
The gases of combustion leaving a boiler that has natural draft are controlled by \_\_\_\_\_\_\_\_\_\_\_\_.
A. Outlet dampers
B. Inlet dampers
C. Higher firing rates
D. An induced draft fan
A

A. Outlet dampers

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6
Q 
The oldest form of draft used in a boiler is \_\_\_\_\_\_\_\_\_\_\_\_.
A. Mechanical
B. Natural
C. Forced
D. Combination
A

B. Natural

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7
Q 
Mechanical draft is produced by the \_\_\_\_\_\_\_\_\_\_\_\_.
A. Height of the chimney
B. Diameter of the chimney
C. Power-driven fans
D. Steam jets
A

C. Power-driven fans

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8
Q 
Mechanical draft can be classified as \_\_\_\_\_\_\_\_\_\_\_\_.
A. Pressurized
B. Natural
C. Regenerative
D. Forced or induced
A

D. Forced or induced

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9
Q

The induced draft fan is located ____________.
A. Between the boiler and the chimney
B. At the base of the chimney
C. At the burner
D. In the first pass of the gases of combustion

A

A. Between the boiler and the chimney

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10
Q

If the temperature of air entering the heater gets too low, it will cause ____________.
A. Condensation on the gas side of the air heater
B. Thermal shock to the heater
C. Incomplete combustion
D. Oxygen pitting

A

A. Condensation on the gas side of the air heater

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11
Q

Air heaters must be cleaned to ensure good heat transfer by ____________.
A. Wire brushing monthly
B. Reversing air and gas flow
C. Using soot blowers
D. Having high pressure water used on the gas side

A

C. Using soot blowers

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12
Q 
Air heaters can most successfully be used in plants that \_\_\_\_\_\_\_\_\_\_\_\_.
A. Have a fluctuating steam load
B. Have a fairly constant steam load
C. Have high chimneys
D. Burn only coal or fuel oil
A

B. Have a fairly constant steam load

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13
Q 
The pulverized coal draft system consists of a draft fan, an air heater, a dust collector, an air-tempering damper, a pulverizing mill, an exhauster, and a \_\_\_\_\_\_\_\_\_\_\_\_.
A. Dust collector
B. Grate stoker
C. Forced draft fan
D. Windbox
A

A. Dust collector (According to Instructor)

D. Windbox (According to diagram in book)

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14
Q 
A forced draft fan in a pulverized coal draft system takes air from the boiler room and discharges it into the \_\_\_\_\_\_\_\_\_\_\_\_.
A. Air-tempering damper
B. Air heater
C. Dust collector
D. Pulverizing mill
A

B. Air heater

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15
Q 
The air that flows to the air-tempering damper in a pulverized coal draft system blends with air from a boiler room to maintain an air temperature of \_\_\_\_\_\_\_\_\_\_\_\_.
A. 180 °F
B. 200 °F
C. 220 °F
D. 240 °F
A

B. 200 °F

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16
Q 
Which of the following removes undesirable gaseous elements from the flue gas?
A. Scrubber
B. Air heater
C. Spray nozzle
D. Alkaline solution
A

A. Scrubber

17
Q 
Scrubbers remove \_\_\_\_\_\_\_\_\_\_\_\_ , which cause air pollution.
A. Natural elements
B. Acidic chemical compounds
C. Alkaline particles
D. Gas
A

B. Acidic chemical compounds

18
Q 
In combination with carbon dioxide, which of the following are the most common acidic chemical compounds produced in the combustion process?
A. Sulfur dioxide
B. Carbon monoxide
C. Sulfur monoxide
D. Oxygen
A

A. Sulfur dioxide

Boilers (10 decks)

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