Chapter 1

  1. Packaged watertube boilers capacities range from?
    a.  2300 kg to 65000 kg per hour
    b.  500 kg to 100 mg per hour
    c.  15 psi to 15000 kg per hour
    d.  65000 to 100000 kg per hour
    2300 kg to 65000 kg per hour
  2. Packaged boilers main advantage compared to Shop & Field Erected boilers is ____?Assembly Time
    a. Quality
    b. Efficiency
    c. Low Cost
    d. Quality Steam
    low cost
  3. When calculating the output or rating of a boiler one square meter of heating surface equals ____ kilowatts
    (a) 1000
    (b) 10
    (c) 15
    (d) 100
    10
  4. Field erected boilers have outputs of?



    D. 150000 kg/h or more
  5. One square metre of heating surface equals 10 kilowatts. The heating surface of a boiler must be determined by computing the area of the surface involved in square metres and where a computation is to be made of a curved surface; the surface having the greater radius shall be taken.
    a. True
    b. False
    a. True
  6. Where electric power is used as the heating source, the boiler rating shall be the maximum kilowatt rating of the ______ ______.
    a. Power Plant
    b. Heating element
    c. Boiler wiring
    d. MCC
    Heating element
  7. Where the boiler provides the entire steam supply to an electric generating unit, the output of the boiler is expressed in terms of power output of the generator (for example a 300 megawatt boiler).
    a. True
    b. False
    a. True
  8. The downcomers are located in the ______ regions of the boiler, or external to the furnace altogether. The risers are located in the ________ zones of the boiler, being exposed to radiant heat of the furnace or to the very hot flue gases near the furnace.
    a. back, front
    b. cooler, hottest
    c. water, furnace
    d. drum, radiant
    cooler, hottest
  9. Most downcomers run Horizontaly between the steam drum and the mud drum.
    a. True
    b. False
    b. False
  10. The steam separating equipment separates the _______ from the steam/water mixture.



    D. steam
  11. There are several factors that influence the natural circulation in a watertube boiler. These are:




    E. All of the above
  12. The purpose of the downcomer is to supply:




    D. Cool water from steam drum to rest of boiler
  13. Natural circulation in a boiler depends upon the ___________ in the density of a column of water and the density of a column containing a steam/water mixture.



    B. difference
  14. These types of boilers (A, D, and O) have furnaces cooled by _________ lining the furnace walls.



    B. watertubes
  15. In the economizer section the feed-water is normally heated to within ____ of the boiler water temperature.



    (C) 20 degree
  16. In the reheater section, the temperature of the steam is raised to approximately the original superheat temperature ____.



    (A) 538 Degree
  17. A steam generating unit consists of a number of elements all of which contribute to the production of steam.The elements of a typical steam generator include:
    1. boiler
    2. superheater
    3. water conditioner
    4. reheater
    5. economizer
    6. steam piping
    7. air heater
    8. fuel equipment
    9. draft fans



    B. 1, 2, 4, 5, 7, 8, 9
  18. Feed-water entering the boiler section first passes through the __________ section where it is heated by the combustion gases leaving the boiler.



    B. economizer
  19. Combustion air for the burners is preheated to ______ in the air heater section by combustion gases leaving the economizer section.



    C. 350 °C
  20. Generally two types of draft fans are used. A _____ ____ fan supplies air to the air preheater. The preheated air (350°C) for combustion goes to the coal pulverizers and to the burners. An ______ ____ fan exhausts the combustion gases (170°C) from the air heater to the stack.



    B. forced draft, induced draft
  21. Steam Generators operating above ___are said to be super critical



    (B) Critical Pressure
  22. The difference in density between water and saturated steam becomes progressively less with increased pressure and disappears altogether at the critical pressure _______ .



    A. 22106 kPa
  23. Steam generators operating above critical pressure are said to be ______-critical and steam generators operating below critical pressure are classed as ____-critical.



    A. super, sub
  24. The advantage of forced circulation in a boiler is a _________ flow in all tubes.



    B. positive
  25. The disadvantages of forced circulation in a boiler are the ______ _____ of equipment, pumps, piping, etc.



    D. increased costs
  26. The arrangement of a once through boiler has no drums. The feed water is heated and then evaporated and superheated in ______ ______ through the unit.



    A. One passage
Author
PowerPrep
ID
317522
Card Set
Chapter 1
Description
Chapter 1
Updated