logo

CuriousTab

CuriousTab

Discussion


Home Chemical Engineering Furnace Technology Comments

  • Question
  • Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.


  • Options
  • A. 350
  • B. 750
  • C. 1050
  • D. 1250

  • Correct Answer
  • 750 


  • Furnace Technology problems


    Search Results


    • 1. Rotary kilns are used in the

    • Options
    • A. calcination of limestone & dolomite.
    • B. cement manufacture.
    • C. both (a) and (b).
    • D. neither (a) nor (6).
    • Discuss
    • 2. Which of the following accentuates clinker-ing troubles on furnace grate burning coal?

    • Options
    • A. Low reactivity of carbonised residue containing high proportion of iron & sulphur.
    • B. Low forced draft & fuel bed temperature.
    • C. Thick firebed and preheated primary air.
    • D. All (a), (b) and (c).
    • Discuss
    • 3. An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.

    • Options
    • A. resistance
    • B. arc
    • C. low frequency induction
    • D. none of these
    • Discuss
    • 4. Maximum thermal efficiency of boiler may be about __________ percent.

    • Options
    • A. 10
    • B. 25
    • C. 65
    • D. 90
    • Discuss
    • 5. Which of the following is a batch furnace?

    • Options
    • A. Cupola
    • B. Reheating furnace
    • C. Glass tank furnace
    • D. None of these
    • Discuss
    • 6. Very high pressure boilers are usually __________ boilers.

    • Options
    • A. fire tube
    • B. water tube
    • C. waste heat
    • D. natural circulation
    • Discuss
    • 7. Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace?

    • Options
    • A. Economiser.
    • B. Regenerator.
    • C. Ceramic recuperator.
    • D. Waste heat boiler.
    • Discuss
    • 8. Heat transfer rate to the charge/stock in a furnace does not depend upon the

    • Options
    • A. type of fuels viz solid, liquid or gaseous.
    • B. flue gas temperature.
    • C. emissivity of refractory walls.
    • D. initial temperature of the charged stock.
    • Discuss
    • 9. In low or standard frequency induction furnace, heat is produced by the

    • Options
    • A. combination of induced current and skin effect.
    • B. induction and resistance.
    • C. current flow through a heating element.
    • D. none of these.
    • Discuss
    • 10. Ingress of cold air in the furnaces through cracks, charging doors, openings etc.

    • Options
    • A. reduces the flue gas temperature and makes the furnace atmosphere oxidising.
    • B. increases the load on the induced draft fan.
    • C. reduces the furnace draught.
    • D. all (a), (b) and (c)
    • Discuss


    Comments

    There are no comments.

Enter a new Comment