Computer Test on New Furnace Technology - Set 04 - ObjectiveBooks

Computer Test on New Furnace Technology - Set 04

Practice Test: Question Set - 04

1. Ceramic recuperators compared to metallic recuperators for the same duty
    (A) Are lighter
    (B) Occupy more space
    (C) Are less costly
    (D) Have higher pressure differential between flue gas & air side

2. Reverberatory furnace is used for
    (A) Roasting/reduction of ores
    (B) Annealing steel coil
    (C) Heating air
    (D) Steel melting

3. Rate of heat release in a furnace, which is the measure of heat intensity, is defined as
    (A) kcal/hr/m3 combustion space
    (B) kcal/m3 combustion space
    (C) kcal/hr
    (D) None of these

4. Fuel used in B.F. stove is
    (A) Pulverised coal
    (B) Furnace oil
    (C) Blast furnace gas/mixed gas
    (D) Coke oven gas

5. Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the
    (A) Quantity & temperature of waste gas
    (B) Dust concentration & nature of dust in waste gas
    (C) Corrosive nature of the waste gas
    (D) All (a), (b) and (c)

6. In a furnace operation, which is not preheated?
    (A) Solid fuels
    (B) Hydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.)
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

7. Maximum heat transfer in high temperature furnaces is by
    (A) Conduction
    (B) Convection
    (C) Radiation
    (D) Either (a), (b) or (c); depends on the type of furnace

8. The main function of a muffle in the muffle furnace is to
    (A) Protect the charge from the effects of the products of combustion
    (B) Smooth out temperature inequalities on the combustion side of the muffle wall
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

9. Decarburisation of steel
    (A) Is the removal of carbon from iron carbide (Fe3C)
    (B) Affects its crystalline structure
    (C) Is favoured by CO2
    (D) All (a), (b) and (c)

10. Heat transfer rate to the stock/charge in the furnace does not depend upon the
    (A) Emissivity of the refractory walls
    (B) Size of the furnace
    (C) Use of waste heat recovery equipments
    (D) Thickness of the stock

11. Hearth furnaces are not used for
    (A) Roasting
    (B) Melting
    (C) Reheating
    (D) None of these

12. In order to maintain an oxidising atmosphere in a furnace, it should have
    (A) More of excess air
    (B) Less of excess air
    (C) More of CO in flue gas
    (D) More of CO2 in flue gas

13. In a muffle furnace, the muffle
    (A) Retards the heat transfer
    (B) Assists in temperature equalisation in the charge
    (C) Permits the use of controlled atmosphere for the protection of stock
    (D) All (a), (b) and (c)

14. Which is a regenerative furnace?
    (A) Coke oven heating chamber
    (B) Open hearth furnace
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

15. Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C.
    (A) 5
    (B) 60
    (C) 20
    (D) 40

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