Furnace Technology Online MCQ Practice Test - Set 01 - ObjectiveBooks

Furnace Technology Online MCQ Practice Test - Set 01

Practice Test: Question Set - 01

1. In which of the following furnaces, the gases are sucked through the stock bed from below?
    (A) Soaking pit
    (B) Sintering machine
    (C) Beehive oven
    (D) None of these

2. In order to maintain a reducing atmosphere in a furnace, it should have
    (A) No O2 in flue gas
    (B) CO in flue gas
    (C) High excess air
    (D) None of these

3. Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a
    (A) Furnace employing neutral atmosphere
    (B) Carbon resistance furnace
    (C) Reducing atmosphere
    (D) Furnace employing negative pressure

4. The heating capacity of continuous reheating furnace depends upon the
    (A) Hearth area and furnace temperature
    (B) Emissivity of the stock
    (C) Ratio of wall surface to stock surface
    (D) All (a), (b) and (c)

5. Which of the following variables affects the furnace capacity?
    (A) Temperature of flue gas
    (B) Thermal conductivity of stock
    (C) Thickness of heating stock
    (D) All (a), (b) and (c)

6. The purpose of controlling the furnace atmosphere is to prevent surface attack by
    (A) Oxidation/scaling
    (B) Decarburising
    (C) Sulphur penetration
    (D) Either of the above

7. Scaling of furnace stock is reduced by __________ in flue gas.
    (A) CO
    (B) H2
    (C) High CO/CO2
    (D) All (a), (b) & (c)

8. Which is not accomplished in an underfired furnace?
    (A) Increase in heating capacity/m2 of floor space
    (B) Elimination of cold spot at the bottom of the charge
    (C) Reduction in the temperature of furnace gases
    (D) Protection of the periphery of the charge from excessive radiation

9. An improved and fuel efficient version of the pusher type reheating furnace is the __________ furnace.
    (A) Walking beam
    (B) Shaft
    (C) Tunnel
    (D) Rotary hearth

10. Circulation of gases in furnace is caused by the
    (A) Change in volume during a change of temperature
    (B) Difference in density between hot and cold gases
    (C) Furnace pressure in conjunction with draft in flues
    (D) All (a), (b) and (c)

11. Forced recirculation of furnace gases is practised
    (A) To increase heat transfer by convection
    (B) To ensure uniform temperature
    (C) In furnaces, operating below 750°C
    (D) All (a), (b) and (c)

12. Which of the following variables does not affect the furnace capacity?
    (A) Size of the furnace
    (B) Gas velocity in furnace
    (C) Ratio of wall surface to surface of stock
    (D) None of these

13. In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the
    (A) Rate of firing and emissivity of flame
    (B) Thermal conductivity of the charge & structural materials of furnace
    (C) Nature of process; whether batch, continuous or intermittent
    (D) All (a), (b) and (c)

14. An example of a periodic furnace is the
    (A) Blast furnace stoves
    (B) Blast furnace
    (C) Coke oven heating chamber
    (D) Rotary kilns

15. Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C.
    (A) 50
    (B) 100
    (C) 150
    (D) 250

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