Furnace Technology Objective Questions & Answers - ObjectiveBooks

Furnace Technology Objective Questions & Answers

Practice Test: Question Set - 10


1. The thermal efficiency of a steel slab reheating furnace (walking beam type) may be about _________ percent.

    (A) 15
    (B) 40
    (C) 70
    (D) 85

2. Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of

    (A) Furnace oil with air
    (B) Furnace oil with oxygen
    (C) Blast furnace gas with air
    (D) Blast furnace gas with oxygen

3. Neutral atmosphere is maintained in a/an __________ furnace.

    (A) Cold rolled steel coil annealing
    (B) Open hearth
    (C) Soaking pit
    (D) Walking beam reheating

4. Which of the following is not an additive for flue gases from furnace to reduce its dew-point?

    (A) Ammonia
    (B) Fine dolomite
    (C) Alkaline powders
    (D) None of these

5. An example of indirectly heated furnace is the

    (A) Soaking pit
    (B) Muffle furnace
    (C) Reheating furnace
    (D) None of these

6. The function of an economiser in a boiler is to preheat the

    (A) Feedwater
    (B) Combustion air
    (C) Pulverised coal
    (D) Furnace oil

7. Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of
    (A) Low emissivity
    (B) High thermal conductivity
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

8. Which of the following furnaces will have maximum thermal efficiency?

    (A) Soaking pits
    (B) Walking beam reheating furnace
    (C) Boiler furnace
    (D) Rotary kilns

9. The resistance furnace produces heat by the

    (A) Electric arc struck between electrodes and the charge
    (B) Flow of current through a heating element
    (C) Combination of induced current and skin effect
    (D) None of these

10. Ostwald charts are meant for

    (A) Computing the excess/deficiency of combustion air
    (B) Calculation of flue gas temperature
    (C) Computation of flue gas analysis
    (D) None of these

11. Dampers are located

    (A) Before the I.D fan
    (B) After the I.D. fan
    (C) Near the top of the chimney
    (D) Anywhere after the I.D. fan

12. Regenerators as compared to recuperators for the same duty

    (A) Store smaller quantity of waste heat
    (B) Are lighter & compact
    (C) Involve higher initial cost
    (D) All (a), (b) & (c)

13. Calcination of limestone to produce lime is done in a ________ kiln.

    (A) Tunnel
    (B) Rotary
    (C) Vertical shaft
    (D) Both (b) and (c)

14. Which furnace employs natural draft?

    (A) Coke oven
    (B) Boiler
    (C) Rotary kilns
    (D) L.D. converter

15. Oxygen enrichment of combustion air does not result in increase of the
    (A) Flame temperature
    (B) Oxygen in the flue gas
    (C) Stack loss
    (D) Heat transfer rate in the furnace

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