Chapter 7

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  1. Draft in a furnace depends on: 
    1.  The temperature of atmospheric air
    2.  The height of the stack
    3.  The pressure in the furnace chamber
    4.  The temperature of the gases in the stack
    A.  1, 4
    B.  2, 3, 4
    C.  1, 2, 3, 4
    D.  1, 2, 4
    E.  1, 2, 3
    D.  1, 2, 4
    (this multiple choice question has been scrambled)
  2. Draft is a term that indicates: 
    A.  Atmospheric pressure
    B.  Friction pressure
    C.  Static pressure
    D.  Gauge pressure
    E.  Absolute pressure
    C.  Static pressure
    (this multiple choice question has been scrambled)
  3. In a boiler duct, pressure drop through a restriction is used to:
    a. Measure the draft
    b. Measure the air flow
    c. Measure the density
    d. Measure the secondary air pressure
    e. measure air temperature
  4. Natural draft is the difference in pressure caused by:
    A. The diameter of the stack
    B. The height of the furnace
    C. the height of the stack
    D. The atmospheric air conditions
    E. The temperature in the furnace
    C. the height of the stack
    (this multiple choice question has been scrambled)
  5. Advantages of mechanical draft are:
    1. Better purging of boiler
    2. Less expensive stack can be used
    3. Less supervision during operation
    4. Increases unit efficiency
    A. 1, 4
    B. 1, 2, 4
    C. 2, 3, 4
    D. 1, 2
    E. 1, 2, 3
    B. 1, 2, 4
    (this multiple choice question has been scrambled)
  6. Disadvantages of mechanical draft are:
    1. Higher initial cost
    2. Closer supervision is required
    3. More expensive stack must be used
    4. Draft is dependent on atmospheric conditions
    A. 1, 4
    B. 1, 3
    C. 2, 3
    D. 3, 4
    E. 1, 2
    E. 1, 2
    (this multiple choice question has been scrambled)
  7. The __________ fan provides the volume of combustion air to the boiler.
    A. forced draft
    B. induced draft
    C. balanced draft
    D. cross draft
    A. forced draft
    (this multiple choice question has been scrambled)
  8. The __________ fan provides the volume of combustion air to the boiler.
    A. induced draft
    B. cross draft
    C. forced draft
    D. balanced draft
    C. forced draft
    (this multiple choice question has been scrambled)
  9. The __________ fan is used to remove the hot flue gases from the boiler.
    A. balanced draft
    B. forced draft
    C. induced draft
    D. cross draft
    C. induced draft
    (this multiple choice question has been scrambled)
  10. When furnace draft is maintained at atmospheric pressure (or just below), the draft is referred to as:
    A. Forced draft
    B. Natural draft
    C. Induced draft
    D. negative draft
    E. Balanced draft
    E. Balanced draft
    (this multiple choice question has been scrambled)
  11. The instruments used to monitor the air and flue gas system in a boiler consist of instruments that measure:
    1. Pressure
    2. Temperature
    3. Density
    4. Flow
    A. 1, 2, 3, 4
    B. 1, 2, 3
    C. 1, 2, 4
    D. 1, 3, 4
    E. 2, 3, 4
    C. 1, 2, 4
    (this multiple choice question has been scrambled)
  12. Draft is measured in:
    A. cm of mercury
    B. mm of mercury
    C. mm of wg
    D. cm of wg
    E. kPa
    D. cm of wg
    (this multiple choice question has been scrambled)
  13. A simple gauge for measuring draft consists of a glass U tube containing water. This type of gauge is known as a _________.
    A. diaphragm
    B. orsat
    C. pressuretube
    D. manometer
    D. manometer
    (this multiple choice question has been scrambled)
  14. A type of gauge that has superseded the U tube for measuring boiler draft is the ________ gauge.
    A. pressuretube
    B. diaphragm
    C. manometer
    D. orsat
    B. diaphragm
    (this multiple choice question has been scrambled)
  15. Draft fans can be divided into the following types:
    1. Backward curved blade
    2. Air foil curved blade
    3. Straight blade
    4. Forward curved blade
    A. 2, 3, 4
    B. 1, 2, 3, 4
    C. 1, 3, 4
    D. 1, 4
    E. 1, 2, 3
    B. 1, 2, 3, 4
    (this multiple choice question has been scrambled)
  16. Which of the following types of fan blades would have the lowest tip velocities?
    A. Straight blades
    B. axial blades
    C. Round blades
    D. Forward curved blades
    E. Backward curved blades
    D. Forward curved blades
    (this multiple choice question has been scrambled)
  17. Draft fan output is controlled by:
    1. Variable speed
    2. Inlet damper control
    3. Outlet damper control
    4. Variable area for blades
    A. 2, 3, 4
    B. 1, 2, 3, 4
    C. 1, 2, 3
    D. 1, 3, 4
    E. 1, 2, 4
    C. 1, 2, 3
    (this multiple choice question has been scrambled)
  18. One advantage of inlet vanes to control the output of an I.D. fan is:
    A. Less resistance is produced
    B. Less maintenance is required
    C. Air entering the fan receives a spin in the direction of wheel rotation
    D. Less control mechanisms are required
    C. Air entering the fan receives a spin in the direction of wheel rotation
    (this multiple choice question has been scrambled)
  19. The most efficient method of controlling an I.D. or F.D. fan on output is:
    A. Variable speed control
    B. constant speed control
    C. Inlet damper control
    D. Outlet damper control
    E. Inlet and outlet damper control
    A. Variable speed control
    (this multiple choice question has been scrambled)
  20. The windbox is an extension of the air ducts and serves as a __________ chamber for the air.
    A. distributing
    B. cooling
    C. stilling
    D. expansion
    A. distributing
    (this multiple choice question has been scrambled)
  21. Louvers are installed in the ________ to direct the air to the base of the flame.
    A. fan
    B. burner
    C. windbox
    D. ducts
    C. windbox
    (this multiple choice question has been scrambled)
  22. When a boiler is burning solid fuels, the primary air is usually admitted:
    A. By the I.D. fan
    B. around the fuel bed
    C. Over the fuel bed
    D. With the secondary air
    E. Under the fuel bed
    E. Under the fuel bed
    (this multiple choice question has been scrambled)
  23. When a boiler is burning solid fuels, the secondary air is usually admitted:
    A. Over the fuel bed
    B. Through the fuel bed
    C. around the fuel bed
    D. Under the fuel bed
    E. With the primary air
    B. Through the fuel bed
    (this multiple choice question has been scrambled)
  24. Solid pollutants are dust particles known as ash, consisting mainly of the __________ parts of the fuel.
    A. solid
    B. metal
    C. combustible
    D. non-combustible
    D. non-combustible
    (this multiple choice question has been scrambled)
  25. In modern pulverized coal firing facilities, the high __________ between the coal and the combustion air stream causes most of the ash to be carried over with the stack effluents.
    A. turbulence
    B. temperatures
    C. quality
    D. flow
    A. turbulence
    (this multiple choice question has been scrambled)
  26. The theory of particle precipitation is based on the fact that, when a moving particle changes its ________, a force is generated as a consequence.
    A. velocity
    B. humitity
    C. charge
    D. direction
    A. velocity
    (this multiple choice question has been scrambled)
  27. In a cyclone precipitator a spray of water turns the individual dust particles into heavy mud particles.
    a. True
    b. False
    a. True
  28. Dust laden flue gas from the boiler enters the _________ precipitator that contains a charging electrode. The dust particles receive a charge of electricity and become electrified.
    A. cyclone
    B. mist
    C. electric
    D. electrostatic
    D. electrostatic
    (this multiple choice question has been scrambled)
  29. The __________ use several filter bags, in parallel, and the principle is the same as that of the domestic vacuum cleaner. The fabric of the bags is large enough to allow the flue gas molecules to pass through but small enough to catch the dust particles.
    A. electric
    B. bag houses
    C. electrostatic
    D. cyclone
    B. bag houses
    (this multiple choice question has been scrambled)
  30. The type of _____ _____ system used at a plant depends upon the method of firing and the size of the plant.
    A. water washing
    B. ash handling
    C. partical percipitator
    D. distributed control
    B. ash handling
    (this multiple choice question has been scrambled)
  31. A small plant firing with ______ may be arranged so that trucks can be driven into the basement and the ash from the ash pit dumped directly into them.
    A. coal
    B. stokers
    C. burners
    D. methane
    B. stokers
    (this multiple choice question has been scrambled)
  32. __________ systems often use jet pumps to move a mixture of water and ash to the disposal area, via a closed pipeline.
    A. ash
    B. mechanical
    C. Hydro
    D. pneumatic
    C. Hydro
    (this multiple choice question has been scrambled)
  33. A __________ system moves the ash in a stream of air, or flue gas.
    A. pneumatic
    B. mechanical
    C. Hydro
    D. ash
    A. pneumatic
    (this multiple choice question has been scrambled)
  34. The __________ system involves the use of solids handling equipment, such as scraper conveyors, bucket elevators, and conveyor belts.
    A. pneumatic
    B. Hydro
    C. mechanical
    D. ash
    C. mechanical
    (this multiple choice question has been scrambled)
  35. Recovery systems, for the removal of SO2 can be classified into two major types:
    A. large, small
    B. solid, liquid
    C. adsorption, absorption
    D. wet, dry
    D. wet, dry
    (this multiple choice question has been scrambled)
  36. In the ____ scrubbing system, a solution of lime/limestone slurry contacts the sulphur dioxide laden flue gas.
    A. dry
    B. liquid
    C. wet
    D. absorption
    C. wet
    (this multiple choice question has been scrambled)
  37. In the ____ scrubbing process, the heat of the flue gas is used to dry finely atomized slurry of alkaline reactants.
    A. wet
    B. liquid
    C. dry
    D. absorption
    C. dry
    (this multiple choice question has been scrambled)

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Author:
PowerPrep
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317565
Filename:
Chapter 7
Updated:
2016-03-20 13:20:37
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Chapter 7
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