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

  • A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is knwon as


  • Options
  • A. superheater
  • B. air preheater
  • C. economiser
  • D. injector

  • Correct Answer
  • air preheater 

    • More questions

    • 1. When the grinding wheel is marked by the letters from I to P, it indicates that the grinding wheel is of hard grade.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. The cylinder of a gas engine is made __________ than that of the petrol engine.

    • Options
    • A. smaller
    • B. larger
      • Discuss
    • 3. The velocity ratio for the first system of pulleys is(where n is the number of pulleys.)

    • Options
    • A. n
    • B. n2
    • C. 2n
    • D. 2n - 1
      • Discuss
    • 4. Which of the following statement is correct?

    • Options
    • A. The algebraic sum of the forces, constituting the couple is zero.
    • B. The algebraic sum of the forces, constituting the couple, about any point is the same.
    • C. A couple cannot be balanced by a single force but can be balanced only by a couple of opposite sense.
    • D. all of the above
      • Discuss
    • 5. When a train is rounding a curve, the side thrust on the wheel flanges is prevented by raising the outer edge of the rail.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 6. A body of mass m moving with a constant velocity v strikes another body of same mass m moving with same velocity but in opposite direction. The common velocity of both the bodies after collision is

    • Options
    • A. v
    • B. 2v
    • C. 4v
    • D. 8v
      • Discuss
    • 7. A machine having an efficiency less than 50%, is known as

    • Options
    • A. reversible machine
    • B. non-reversible machine
    • C. neither reversible nor non-reversible machine
    • D. ideal machine
      • Discuss
    • 8. Moment of inertia of a hollow rectangular section as shown in the below figure about Y-Y axis, is not the same as that about X-X axis.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 9. One joule means that

    • Options
    • A. work is done by a force of 1 N when it displaces a body through 1m
    • B. work is done by a force of 1 kg when it displaces a body through 1 m
    • C. work is done by a force of 1 dyne when it displaces a body through 1 cm
    • D. work is done by a force of 1 g when it displaces a body through 1 cm
      • Discuss
    • 10. One kg of carbon requires 4/3 kg of oxygen and produces __________ kg of carbon monoxide gas.

    • Options
    • A. 8/3
    • B. 11/3
    • C. 11/7
    • D. 7/3
      • Discuss

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