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  • Question
  • 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

  • Correct Answer
  • arc 


  • Furnace Technology problems


    Search Results


    • 1. Maximum thermal efficiency of boiler may be about __________ percent.

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

    • Options
    • A. Cupola
    • B. Reheating furnace
    • C. Glass tank furnace
    • D. None of these
    • Discuss
    • 3. Purchased cost of equipments for a chemical process plant ranges from __________ percent of the fixed capital investment.

    • Options
    • A. 10 to 20
    • B. 20 to 40
    • C. 45 to 60
    • D. 65 to 75
    • Discuss
    • 4. Relative cost of chemical process plants in India is about __________ percent more than the similar plants in U.S.A.

    • Options
    • A. 15
    • B. 35
    • C. 55
    • D. 75
    • Discuss
    • 5. An investment of Rs. 100 lakhs is to be made for construction of a plant, which will take two years to start production. The annual profit from the operation of the plant is Rs. 20 lakhs. What will be the pay back time?

    • Options
    • A. 5 years
    • B. 7 years
    • C. 12 years
    • D. 10 years
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • Discuss
    • 9. Very high pressure boilers are usually __________ boilers.

    • Options
    • A. fire tube
    • B. water tube
    • C. waste heat
    • D. natural circulation
    • Discuss
    • 10. 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


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