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Home ‣ Mechanical Engineering ‣ Steam Boilers and Engines See What Others Are Saying!
  • Question

  • The air pressure at the fuel bed is reduced below that of atmosphere by means of a fan placed at or near the bottom of the chimney to produce a draught. Such a draught is called


  • Options
  • A. natural draught
  • B. induced draught
  • C. forced draught
  • D. balanced draught

  • Correct Answer
  • induced draught 

    • More questions

    • 1. The natural convection air cooled condensers are used in

    • Options
    • A. domestic refrigerators
    • B. water coolers
    • C. room air conditioners
    • D. all of these
      • Discuss
    • 2. The process of heat transfer from a hot body to a cold body, in a straight line, without affecting the intervening medium, is called radiation.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. The iron ore in the charge of blast furnace acts as an iron bearing mineral.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. A flow in which the quantity of liquid flowing per second is not constant, is called

    • Options
    • A. streamline flow
    • B. turbulent flow
    • C. steady flow
    • D. unsteady flow
      • Discuss
    • 5. The volumetric efficiency for reciprocating air compressors is about

    • Options
    • A. 10 to 40%
    • B. 40 to 60%
    • C. 60 to 70%
    • D. 70 to 90%
      • Discuss
    • 6. The angle included between the two lips projected upon a plane parallel to the drill axis and paralled to the two cutting lips, is called helix angle.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 7. The increase in pressure in a roots blower is entirely due to back flow of air.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 8. The power actually developed by the engine cylinder of an I.C. engine is known as

    • Options
    • A. theoretical power
    • B. actual power
    • C. indicated power
    • D. none of these
      • Discuss
    • 9. The horizontal and non-uniformly spaced lines on a psychrometric chart indicates

    • Options
    • A. dry bulb temperature
    • B. wet bulb temperature
    • C. dew point temperature
    • D. specific humidity
      • Discuss
    • 10. A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is

    • Options
    • A. 0.26
    • B. 0.36
    • C. 0, 46
    • D. 0.56
      • Discuss

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