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  • Question

  • Blow off cock in a boiler is used to


  • Options
  • A. control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
  • B. empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
  • C. put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
  • D. increase the temperature of saturated steam without raising its pressure

  • Correct Answer
  • empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler 

    • Steam Boilers and Engines problems

    Search Results

    • 1. Which of the following is required for a steam condensing plant?

    • Options
    • A. Condenser
    • B. Condensate pump
    • C. Air extraction pump
    • D. all of these
      • Discuss
    • 2. When the total heat of steam is h kJ/kg and the sensible heat of feed water is hf1 kJ/kg, then the factor of evaporation is given by

    • Options
    • A.
    • B.
    • C.
    • D. none of these
      • Discuss
    • 3. The ratio of the volume at cut-off to the swept volume is called

    • Options
    • A. cut-off ratio
    • B. expansion ratio
    • C. clearance ratio
    • D. none of these
      • Discuss
    • 4. The artificial draught is produced by

    • Options
    • A. steam jet
    • B. centrifugal fan
    • C. chimney
    • D. both (a) and (b)
      • Discuss
    • 5. The mechanical draught __________ with the amount of smoke.

    • Options
    • A. increases
    • B. decreases
    • C. does not effect
      • Discuss
    • 6. Lancashire boiler is a stationary fire tube boiler.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 7. Babcock and Wilcox boiler is a stationary type of water tube boiler.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 8. The cylindrical shell of a Lancashire boiler has diameter from

    • Options
    • A. 1 to 2 m
    • B. 1.25 to 2.25 m
    • C. 1.5 to 2.5 m
    • D. 1.75 to 2.75 m
      • Discuss
    • 9. The ratio of heat actually used in producing the steam to the heat liberated in the furnace, is known as

    • Options
    • A. equivalent evaporation
    • B. factor of evaporation
    • C. boiler efficiency
    • D. power of a boiler
      • Discuss
    • 10. Willian's law states that the steam consumption per hour provided with a throttled governor is proportional to (where I.P. = Indicated power)

    • Options
    • A.
    • B.
    • C. I.P.
    • D. (I.P.)2
      • Discuss

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