Chemical Engineering Plasma Furnace Technology MCQ - Set 06 - ObjectiveBooks

Chemical Engineering Plasma Furnace Technology MCQ - Set 06

Practice Test: Question Set - 06

1. Which of the following is the most suitable for preheating combustion air above 650°C?
    (A) Regenerator
    (B) Metallic recuperator
    (C) Ceramic recuperator
    (D) None of these

2. Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an
    (A) Blast furnace
    (B) Steam boiler
    (C) Salt bath furnace
    (D) Annealing furnace

3. Artificial draught produced by a fan in the furnace can be controlled by the
    (A) Speed of the fan
    (B) Damper
    (C) Variation in the pitch of fan blades
    (D) All (a), (b) and (c)

4. Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of
    (A) Graphite powder
    (B) Thoria
    (C) Zircon powder
    (D) Beryllium

5. Protective gas used in the annealing furnace for steel coil comprises of
    (A) 95% N2 + 5% H2
    (B) 5% H2 + 9% N2
    (C) 100% CO
    (D) 100% H2

6. Which one is not an induced draught furnace?
    (A) Blast furnace stove
    (B) Sintering furnace
    (C) High pressure boiler
    (D) None of these

7. Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ °C.
    (A) 80
    (B) 130
    (C) 180
    (D) 250

8. Furnace pressure is normally controlled by regulating the
    (A) Air pressure
    (B) Fuel gas pressure
    (C) Speed of I.D. fan
    (D) Damper

9. Reheating furnace (pusher type) is used for heating
    (A) Ingots
    (B) Slabs
    (C) Steel coils
    (D) Steel sheets

10. _________ is an indirectly heated furnace.
    (A) Open hearth furnace
    (B) Muffle furnace
    (C) Soaking pit
    (D) Reheating furnace

11. Shaft furnaces are used for
    (A) Smelting
    (B) Calcining
    (C) Roasting
    (D) All (a), (b) and (c)

12. Fuel economy in furnaces can be achieved by
    (A) Using oxygen enriched combustion air
    (B) Preheating the combustion air
    (C) Reducing the heat loss through furnace openings & doors
    (D) All (a), (b) and (c)

13. Regenerators are installed in
    (A) Coke ovens
    (B) Open hearth furnace
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

14. Ingress of cold air in the furnaces through cracks, charging doors, openings etc.
    (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)

15. Presence of SO2 in furnace gases attacks the ferrous metal by way of
    (A) Accelerating the rate of scaling
    (B) Causing metal embrittlement
    (C) Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at high temperature
    (D) All (a), (b) and (c)

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