Chapter 5

  1. If the adjusting ring on a safety valve is screwed downwards, the blowdown will be ____ because the ring increases the area of the ports.



    D.   Shorter
  2. Safety valves
    1. Prevent loss of production in a plant
    2. Prevent bursting of the boiler drum
    3. Release steam to the atmosphere
    4. Are not required on boilers




    B. 2, 3
  3. To increase the popping pressure of a safety valve:




    C. The adjusting ring is screwed downward
  4. To increase the blow down of a safety valve:
    1. Increase the spring tension
    2. Increase the port openings
    3. Screw the adjusting ring upwards
    4. Decrease the port opening




    A. 3, 4
  5. The popping pressure of a safety valve must be:




    A. Higher on the main steam drum than on the superheater
  6. The purpose of the lip or feather on a safety valve seat:
    1. Increases the force of steam acting on the seat
    2. Allows the valve to pop open
    3. Allows simpler construction of the valve
    4. Makes no difference in operation




    A. 1, 2
  7. Safety valves:
    1. Shall be attached as close as possible to the boiler drum
    2. Shall be attached in an upright position with the spindle vertical
    3. Shall have a discharge line attached
    4. Shall have no valve placed between the boiler and the safety valve




    D. 1, 2, 4
  8. A safety valve:
    1. Which discharges shall be located or piped clear of platforms or running boards
    2. Must have a gravity drain installed in the discharge line where condensate may collect
    3. Shall have an open gravity drain in the valve casing below the seat
    4. Has no discharge pipes in some cases




    A. 1, 2, 3, 4
  9. The dial of the gauge must be graduated to at least ____ times the pressure at which the boiler safety valve is set.



    (D) 1.5 times
  10. Safety valves should be opened manually to:




    C. Test the operation of the valve
  11. Every boiler must be fitted with at least one pressure gauge:




    B. To indicate the pressure in the boiler
  12. All steam boilers shall have at least one gauge glass, and boilers operating above ____ shall have two water gauge glasses.




    (A) 3000Kpa???
  13. The main cause of a steam boiler failure is overheating of the heating surfaces due to ____ conditions.



    (C) Low Water
  14. A water gauge glass:
    1. Indicates how much steam is in the boiler
    2. May be connected directly to a boiler
    3. Must have a water column connected to the boiler first
    4. Indicates how much water is in the boiler




    E. 2, 4
  15. During the operation of a boiler, it is extremely important to maintain the correct water level:
    1. To prevent the gas burner from fluctuating
    2. To prevent water carry over
    3. To prevent hot spots
    4. To protect the alternator




    A. 2, 3
  16. The water column:
    1. Acts as a reservoir
    2. Dampens the agitation
    3. Tends to trap any sludge or sediment
    4. Provides a place for the installation of alarm floats




    D. 1, 2, 3, 4
  17. Flat glass gauges:
    1. Are used for pressures above 2750 kPa
    2. Are used on water tube boilers only because they are cooler
    3. Consist of two glass plates, which are bolted to a steel forged housing
    4. Are lined with thin sheets of mica




    D. 1, 3, 4
  18. Water gauge glasses have:
    1. Quick closing type valves in the steam and waterside
    2. Valves with convenient handles, that could be remotely operated if needed
    3. Drain valves, which are slow opening
    4. No drain valves




    C. 1, 2, 3
  19. When repairing a gauge glass:
    1. The boiler gauge glass should not be under pressure
    2. The steam and water connections should be closed and the drain valve should be open
    3. The operator should wear a face shield before pressuring up the glass
    4. The steam and water connection should be blown out before installing the new glass




    C. 1, 2, 3, 4
  20. Low-water fuel cut-offs:




    D. May have a float or electrode chamber
  21. A boiler explosion due to overheating of the heating surfaces may result from:




    C. A low-water cut-off malfunction
  22. Low water level fuel cut-offs:
    1. Are required when a boiler is not under continuous attendance by a certified operator
    2. Are required on fire tube boilers only
    3. Must be installed so that they cannot be rendered inoperative
    4. Must be tested under operating conditions




    A. 1, 3, 4
  23. A low water level fuel cut-off device:
    1. Shuts the fuel off to the boiler when the air flow drops
    2. Shuts the fuel off when the burner pressure is low
    3. Protects the boiler from overheating
    4. Shuts the main fuel valve during a low water condition




    C. 3, 4
  24. The low water level fuel cut-off device:
    1. Should be blown down every shift
    2. Should be blown down once a week
    3. Has a drain valve installed at the bottom connection
    4. Is blown down to prevent sediment build up




    D. 1, 3, 4
  25. Which of the following do not require steam stop valves?
    1. Safety valve
    2. Main steam header
    3. Reheater
    4. Superheater




    A. 1, 3, 4
  26. Steam stop valves:
    1. Can be of the gate or globe type
    2. Can be high or are high pressure valves
    3. May have drain valves located on the lower part of the valve body
    4. Can be of flanged type construction




    B. 1, 2, 3, 4
  27. When two or more boilers are connected to a common main:
    1. It is recommended that each boiler be equipped with an automatic stop-and-check valve
    2. The automatic stop-and-check valve should be located closest to the boiler
    3. They should have stop valves located between the main and the automatic stop and check valve
    4. The space between the stop-and-check valve and the boiler stop valve shall be provided with an adequate drain




    A. 1, 2, 3, 4
  28. A non-return valve:
    1. Can be a globe type valve
    2. Can be an angle type valve
    3. Is the same as a stop-and-check valve
    4. Prevents a backflow of steam from the header to the boiler




    D. 1, 2, 3, 4
  29. A non-return valve:
    1. Can use a piston to cushion the valve upon opening
    2. Can use a spring to cushion the valve upon opening
    3. Does not need anything to cushion the valve upon opening
    4. Opens when the boiler pressure exceeds the main steam header pressure




    B. 1, 2, 4
  30. The purpose of the non-return valve is:




    C. To prevent the back flow of steam
  31. The piping between the non-return valve and the stop valve has a drain valve:
    1. To help warm up the header
    2. To indicate if there is steam flowing from the boiler
    3. To indicate the pressure in the line
    4. To drain the condensate out of the header




    E. 1, 4
  32. The blow-off connection to a boiler:
    1. Is made to the lowest point of the boiler
    2. Is used to drain the boiler
    3. Is used to blow out mud and sediment
    4. Is used to lower the concentration of dissolved impurities




    D. 1, 2, 3, 4
  33. The ASME code required that the blow off piping:
    1. Shall be painted to indicate a hot pipe
    2. Shall not be less than 25 mm and not greater than 64 mm in size
    3. Is exposed to direct furnace heat so it shall be protected by heat resistant material
    4. Shall be of flanged connections




    A. 2, 3
  34. Every steam boiler having a working pressure exceeding 103 kPa:
    1. Shall be equipped with two approved blow-off valves
    2. Must have at least one slow-opening blow-off valve
    3. Must have two slow-opening blow-off valves
    4. Must have two quick-opening blow-off valves




    D. 1, 2
  35. Steam boilers:
    1. Normally do not have blow-off valves
    2. Are normally equipped with one slow-opening and one quick-opening blow-off valve
    3. May be equipped with one slow-opening and one quick-opening blow-off valve
    4. Normally have two quick-opening blow-off valves




    D. 2, 3
  36. When a boiler has a quick-opening and a slow-opening blow-off valve:
    1. The slow-opening valve is next to the boiler
    2. The quick-opening valve is next to the boiler
    3. It does not matter which one is next to the boiler
    4. It does matter which one is next to the boiler




    D. 2, 4
  37. A slow-opening blow-off valve:
    1. Refers to the amount of time taken to open it
    2. Refers to the amount of time taken to close it
    3. Is one which requires at least five 360 degree turns to fully open or to fully close it
    4. Is located down stream of a quick-opening blow-off valve




    C. 3, 4
  38. A slow opening blow-off valve:
    1. Creates less water hammer than a quick-opening blow-off valve
    2. Creates more water hammer than a quick-opening blow-off valve
    3. Creates the same amount of water hammer as a quick-opening type
    4. Is opened after the quick-opening valve




    E. 1, 4
  39. Which of the following is the correct procedure, when blowing down a boiler with both a quick-opening and a slow-opening blow-off valve?




    B. Open the quick-opening valve, then open the slow-opening valve. After blowing down: close the slow-opening valve, then close the quick-opening valve
  40. The most commonly used type of blowdown valves are:
    1. Gate
    2. Globe
    3. Sliding disc
    4. Seatless sliding plunger
    5. Seat and disc
    6. Combination
    7. Butterfly



    (D) 3,4,5,6
  41. All blow-off pipes, valves and fittings must be:
    1. Painted to prevent corrosion
    2. Of heavy construction corresponding to the boiler pressure
    3. Installed without sharp bends
    4. Able to expand and contract without being restricted




    (B) 2,3,4
  42. The purpose of the blow-off tank:
    1. Is to measure the amount of water being blown down from the boiler
    2. Is to prevent steam and hot water from going directly to the sewer
    3. Is to reduce the pressure and the temperature of the water entering the sewer
    4. Is to prevent damage to the sewer system




    D. 2, 3, 4
  43. Steam separators may include:
    1. Dry pipe separator
    2. Wet pipe separator
    3. Cyclone steam separator
    4. Steam scrubbers
    5. Steam washers
    6. Mud drums



    (B) 1,3,4,5
  44. What are drum internals?




    C. The fittings located within the boiler drum
  45. The removal of impurities from the steam is extremely important because:
    1. The boiler uses too much fuel
    2. They will form deposits in the superheater tubes
    3. The over heating of the tubes will result
    4. Deposits will be formed on the turbine blades




    A. 2, 3, 4
  46. The purpose of removing moisture from steam:
    1. Is to lower the solids concentration of the steam
    2. Is to lower the erosion effect on turbines
    3. Is to save water make up to the boiler
    4. Is to save money on the operation of the boiler system




    E. 1, 2, 4
  47. The purpose of the steam washer is:
    1. To scrub the incoming water
    2. To absorb any gaseous impurities in the steam
    3. To prevent excessive water make up to the boiler
    4. To prevent silica build up in the superheater tubes




    A. 2, 4
  48. The internal feed pipe:
    1. Serves to distribute the incoming feedwater uniformly along the length of the drum
    2. Helps prevent scale build up
    3. Prevents temperature shock
    4. Help prevents turbulence




    E. 1, 3, 4
  49. The purpose of the continuous blow-down connection is to:




    E. Lower the concentration of dissolved solids in the boiler water
  50. The advantage of the continuous blow down compared to the bottom blow off:
    1. Is that the valve is smaller to operate
    2. Is that it is much more accurate to control the water concentration
    3. Is that it can be used with a heat exchanger for economy
    4. Is that it replaces the bottom blow-off completely




    C. 2, 3
Author
PowerPrep
ID
317537
Card Set
Chapter 5
Description
Chapter 5
Updated