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3B1 > Ch. 6 > Flashcards

Ch. 6 Flashcards

1
Q
  1. The gas pilot pressure regulator ____ the incoming header gas pressure, ensuring a satisfactory pilot flame.
    a. reduces
    b. increases
    c. controls
    d. samples
A

a. reduces

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2
Q
  1. The main gas pressure regulator ________ the gas pressure at a higher setting than the pilot regulator.
    a. reduces
    b. increases
    c. controls
    d. samples
A

c. controls

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3
Q
  1. A low gas pressure cutoff switch _______ the burner from operating when the gas pressure in the supply line drops below the pressure necessary to maintain a stable flame at the burner.
    a. promotes
    b. prevents
    c. opens
    d. raises
A

b. prevents

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4
Q
  1. The high gas pressure switch contacts are normally _______ whenever the main gas line pressure is below a preset pressure.
    a. open
    b. stable
    c. frozen
    d. closed
A

d. closed

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5
Q
  1. The main gas valves are ON/OFF, normally open, single-seated gas valves, when the electric motors on the valves are energized.
    a. True
    b. False
A

b. False

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6
Q
  1. Most burners have the fuel entering the combustion air stream at or near a __ angle to promote good mixing.
    a. cross
    b. right
    c. upward
    d. down
A

b. right

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7
Q
  1. The multi-spud burner has ______ spuds or jets connected to a circular manifold.
    a. two
    b. five
    c. six
    d. eight
A

d. eight

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8
Q
  1. In a multi-spud burner, each spud is equipped with a ______ valve so that it may be removed for cleaning.
    a. cleaning
    b. shutoff
    c. globe
    d. regulating
A

b. shutoff

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9
Q
  1. The nitrogen and oxygen in the combustion air ______ at high temperatures to form NOx.
    a. react
    b. unite
    c. combine
    d. mix
A

a. react

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10
Q
  1. The thermal NOx reaction occurs rapidly above _____ °C.
    a. 1000
    b. 2500
    c. 15000
    d. 1535
A

d. 1535

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11
Q
  1. To achieve lower NOx the flame temperature must be kept as low as possible. This is achieved by:
    a. Flue gas recirculation
    b. Adding more 02 to the main flame
    c. Air staging
    d. Fuel conditioning
    e. A & C
    f. B & D
    g. C & D
A

e. A & C

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12
Q
  1. The main function of a gas burner is to:
    a. Provide for intimate mixing of gas and combustion air
    b. Admit the gas into the furnace
    c. Regulate the gas flow into the furnace
    d. Assist in the control of air flow to the furnace
    e. Admit combustion air into the furnace
A

a. Provide for intimate mixing of gas and combustion air

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13
Q
  1. The above-ground storage tanks must have an earth or concrete dyke around the tank of such a size as to contain the total volume of oil stored plus one _____.
    a. quarter
    b. third
    c. half
    d. meter
A

b. third

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14
Q
  1. An oil storage tank must not have galvanized pipe, as sulphur in the oil will react with the galvanizing zinc causing _______.
    a. sludge
    b. corrosion
    c. water
    d. ignition
A

a. sludge

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15
Q
  1. The tank steam smothering line is used in the event of ____.
    a. freezing
    b. spills
    c. fire
    d. entry
A

c. fire

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16
Q
  1. The heating of heavy fuel oil takes place in ___ stages.
    a. three
    b. five
    c. many
    d. two
A

d. two

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17
Q
  1. The second stage of heating, to allow atomization of the oil, involves heating the oil to between _____ °C.
    a. 5 and 25
    b. 30 and 50
    c. 70 and 100
    d. 200 and 300
A

c. 70 and 100

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18
Q
  1. The steam atomizer type burners operate on the principle of producing a steam-fuel emulsion that atomizes the oil through the rapid _______ of the steam when released into the furnace.
    a. expansion
    b. velocity
    c. temperature
    d. movement
A

a. expansion

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19
Q
  1. Failure to burn a fuel oil at the correct pressure and temperature and with the correct atomizer will result in:
    1) Flame sputtering
    2) Carbon formation
    3) Flash back
    4) Soot
    a. 1, 2, 3
    b. 1, 2, 4
    c. 2, 3, 4
    d. 1, 2, 3, 4
    e. 1, 3, 4
A

d. 1, 2, 3, 4

20
Q
  1. Which of the following burners supplies oil under high pressure:
    a. Air atomizing
    b. Rotary cup burner
    c. Steam atomizing
    d. Mechanical atomizing
    e. Rotary atomizing
A

d. Mechanical atomizing

21
Q
  1. In steam atomizing the steam supply pressure is:
    a. The same as the oil pressure
    b. Slightly higher than the oil pressure
    c. Slightly lower than the oil pressure
    d. Must be twice as high as the oil pressure
    e. Must be half as high as the oil pressure
A

b. Slightly higher than the oil pressure

22
Q
  1. The advantages of steam atomizing is:
    1) A low turn down ratio is possible
    2) A high turn down ratio is possible
    3) Low pressure may be used
    4) A constant pressure may be maintained from low to high firing condition
    a. 1, 3
    b. 1, 4
    c. 2, 3
    d. 2, 4
    e. 1, 2
A

c. 2, 3

23
Q
  1. Steam atomizing burners require cleaning:
    a. More often than the air atomizer
    b. More often than mechanical atomizers
    c. Less often than mechanical atomizers
    d. Usually only about twice a year
    e. Just as often as mechanical atomizers
A

c. Less often than mechanical atomizers

24
Q
  1. In an air atomizing oil burner the air is called:
    a. Tertiary air
    b. Combustion air
    c. Secondary air
    d. Primary air
    e. Excess air
A

d. Primary air

25
Q
  1. The cup of a rotary cup oil burner rotates at:
    a. 3 200 rpm
    b. 3 400 rpm
    c. 3 500 rpm
    d. 3 800 rpm
    e. 4000 rpm
A

c. 3 500 rpm

26
Q
  1. The purpose served by the coal ______ is to receive the incoming coal supply, place it on stock, and then transport it from stock to boilers at the time and in the form required.
    a. pulverizer
    b. plant
    c. scale
    d. hopper
A

b. plant

27
Q
  1. The coal is fed to the surge bin, where in-line ______ remove any metal.
    a. filters
    b. screens
    c. magnets
    d. shovels
A

c. magnets `

28
Q
  1. A belt scale operates by measuring the speed of the belt and the weight on a suspended section of the carrying run. An ________ relates running weights to belt travel and records the tonnage of coal handled.
    a. integrator
    b. controller
    c. electromagnetic
    d. elevator
A

a. integrator

29
Q
  1. Screens are fitted in the coal route to the bunkers to remove timber, stone, and oversize coal so that the supply to the ________ mills is kept free.
    a. supply
    b. pulverizing
    c. storage
    d. grading
A

b. pulverizing

30
Q
  1. Reserve Storage coal, stocked for extended periods in the open air it will __________ by weathering and also there is an ever-present danger of spontaneous combustion.
    a. mature
    b. vaporize
    c. deteriorate
    d. solidify
A

c. deteriorate

31
Q
  1. The temperature of the stock should be monitored as temps of ___ °C and above indicate the threat of fire.
    a. 100
    b. 50
    c. 200
    d. 70
A

d. 70

32
Q
  1. There are three general firing arrangements:
    a. Horizontal firing
    b. Vertical firing
    c. Tangential firing
    d. Cross firing
    e. Multi firing
    f. A, B, C
    g. C, D, E
A

f. A, B, C

33
Q
  1. The secondary air is admitted to the burner housing surrounding the central nozzle through adjustable _____.
    a. vanes
    b. orifices
    c. louvers
    d. openings
A

a. vanes

34
Q
  1. In a vertical firing arrangement the burners are located in the furnace arch (top) and fire vertically ________.
    a. upward
    b. downward
    c. inside
    d. left
A

b. downward

35
Q
  1. The tangential firing arrangement has burners installed in each of the ______ of the furnace.
    a. walls
    b. sides
    c. corners
    d. arches
A

c. corners

36
Q
  1. The cyclone furnace, is an arrangement whereby crushed coal of __ mm size, rather than pulverized coal, is burned.
    a. 50
    b. 10
    c. 25
    d. 6
A

d. 6

37
Q
  1. A tube (or ball) mill is a hollow cylindrical shell, filled, approximately half full, with forged steel or cast alloy balls, ranging in diameter from ___ mm to ___ mm.
    a. 1 , 25
    b. 25, 51
    c. 30 , 40
    d. 50, 100
A

b. 25, 51

38
Q
  1. High-speed impact pulverizers (turning at 1200 to 1800 r/min) consist of a series of hinged or fixed _______ revolving in a chamber.
    a. balls
    b. weights
    c. hammers
    d. wheels
A

c. hammers

39
Q
  1. The ball race pulverizer is used for grinding all grades of coal.
    a. True
    b. False
A

a. True

40
Q
  1. The bowl mill has ______ to grind the coal between themselves and a slowly rotating horizontal table.
    a. rollers
    b. balls
    c. hammers
    d. grinders
A

a. rollers

41
Q
  1. An overfeed stoker uses the _______ flow of fuel and air, with fuel flowing downward and air flowing upward.
    a. concurrent
    b. crosscurrent
    c. countercurrent
    d. undercurrent
A

c. countercurrent

42
Q
  1. A spreader stoker distributes the coal onto the surface of a traveling grate with ash discharged at the ______ of the furnace.
    a. back
    b. front
    c. side
    d. bottom
A

b. front

43
Q
  1. In a ________ stoker, altering the position of the spill plate or the speed of the rotor changes the distance the coal is thrown.
    a. overfeed
    b. crossfeed
    c. traveling
    d. spreader
A

d. spreader

44
Q
  1. In a ________ stoker, air for combustion is supplied by a forced draft fan and passes up through openings in the grate to the fuel.
    a. overfeed
    b. crossfeed
    c. traveling
    d. spreader
A

b. crossfeed

45
Q
  1. Using preheated air with pulverized coal:
    a. Dries the coal
    b. Helps reduce ash build up
    c. Reduces air pollution
    d. Allows lower grades of fuel to be used
    e. Increases the heating value of the coal
A

a. Dries the coal

46
Q
  1. In an underfeed stoker, air for combustion is supplied to a chamber below the grates, then it passes through the grates via:
    a. Varying the ram stroke
    b. Variable veins
    c. Tuyeres
    d. Dampers
    e. Nozzles
A

c. Tuyeres

47
Q
  1. The types of grates used on a crossfeed stoker are:
    1) Roller grate type
    2) Chain grate type
    3) Bar grate type
    4) Mesh
    a. 1, 2
    b. 1, 3
    c. 2, 3
    d. 2, 4
    e. 1,4
A

b. 1, 3

3B1 (15 decks)

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