MCQ Based Test Latest Furnace Technology - Set 05 - ObjectiveBooks

MCQ Based Test Latest Furnace Technology - Set 05

Practice Test: Question Set - 05

1. In a furnace employing forced draught as compared to induced draught,
    (A) Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced
    (B) The fan operates hot and hence blades are liable to corrosion and erosion
    (C) Positive pressure exists in the furnace
    (D) None of these

2. Regenerators are used for waste heat recovery in
    (A) By-product coke ovens
    (B) Beehive coke oven
    (C) Blast furnace stoves
    (D) Soaking pits

3. An example of recuperative furnace is the
    (A) Soaking pit
    (B) Open hearth furnace
    (C) Coke ovens
    (D) None of these

4. The heat recoverable from flue gases of furnaces depends on the
    (A) Thermal efficiency of furnace
    (B) Quantity of flue gases
    (C) Flue gas temperature drop through the furnace
    (D) All (a), (b) and (c)

5. Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent.
    (A) 10-15
    (B) 25-30
    (C) 45-50
    (D) 65-70

6. Operation of blast furnace stove is based on the principles of a __________ furnace.
    (A) Regenerative
    (B) Recuperative
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

7. Higher furnace temperature cannot be achieved by use of a lean fuel gas in the furnace by
    (A) Increasing the draft in the furnace
    (B) Preheating the fuel gas
    (C) Oxygen enrichment of combustion air
    (D) Preheating the combustion air

8. Air filtration in a furnace
    (A) Reduces its thermal efficiency
    (B) Is indicated by flame sting out
    (C) Increases the flue gas temperature
    (D) None of these

9. Blast furnace stoves are meant for heating
    (A) Air
    (B) Blast furnace gas
    (C) Steam
    (D) None of these

10. Which of the following is not a directly fired furnace?
    (A) By-product coke oven
    (B) Calcination kiln
    (C) Sintering furnace
    (D) Open hearth furnace

11. Heat transfer rate to the charge/stock in a furnace does not depend upon the
    (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

12. Thermal efficiency of an open hearth furnace may be about __________ percent.
    (A) 5
    (B) 20
    (C) 50
    (D) 80

13. The amount of combustible escaping unconsumed from the furnace, depends upon the
    (A) Air supplied and furnace temperature
    (B) Burner design (thoroughness of mixing versus stratification)
    (C) Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction)
    (D) All (a), (b) and (c)

14. The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.
    (A) Arc
    (B) Resistance
    (C) Low frequency induction
    (D) High frequency induction

15. Reducing atmosphere is maintained in a
    (A) Calcination kiln
    (B) Blast furnace
    (C) Soaking pit
    (D) L.D. converter

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