Fuel Combustion and Steam Generation Questions - Set 12 - ObjectiveBooks

Fuel Combustion and Steam Generation Questions - Set 12

Practice Test: Question Set - 12

1. Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the
    (A) Hot scarfing of steel slabs
    (B) Mixing with blast furnace gas
    (C) Coke oven battery heating
    (D) Steel ladle drying

2. High sulphur content in a fuel __________ of the flue gases.
    (A) Decreases the dew point
    (B) Increases the dew point
    (C) Reduces the combustion efficiency by limiting the permissible temperature reduction
    (D) Both (b) and (c)

3. Water gas constitutes mainly of
    (A) CO & H2
    (B) CO & N2
    (C) CO2 & H2
    (D) CH4 & H2

4. Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal?
    (A) Vitrain
    (B) Clarain
    (C) Durain
    (D) Fussain

5. Efficient burning of anthracite coal requires
    (A) Low preheat of air
    (B) Fine grinding
    (C) High excess air
    (D) All (a), (b) and (c)

6. Which will have the least volatile matter and hence will be the most difficult to ignite?
    (A) Bituminous coal
    (B) Coke
    (C) Semi-bituminous coal
    (D) Anthracite

7. Washing of coal is done to reduce the
    (A) Inherent impurities
    (B) Adhering impurities
    (C) Mineral matter
    (D) Both (b) and (c)

8. Number of macrocomponents present in coal according to Stopes are:
    (A) Four
    (B) Five
    (C) Six
    (D) Two

9. Too much of excess air in combustion results in high
    (A) Fuel consumption for the same heat load
    (B) Stack gas temperature
    (C) Percentage of oxygen in flue gases
    (D) All (a), (b) and (c)

10. Weathering of coal during storage causes
    (A) Reduction in coal size
    (B) Increase in its friability
    (C) Decrease in its caking capacity
    (D) All (a), (b) and (c)

11. Coking time in narrow by-product coke ovens is around __________ hours.
    (A) 18
    (B) 48
    (C) 8
    (D) 80

12. The main function of primary air in pulverized coal fired burner is to
    (A) Burn CO to CO2
    (B) Dry and transport the coal
    (C) Have proper combustion by supplying it around the burner
    (D) Preheat the tertiary air used for complete combustion of CO to CO2

13. Which of the following is a primary fuel?
    (A) Blast furnace coke
    (B) Gasoline
    (C) Natural gas
    (D) Wood charcoal

14. Which of the following has the highest calorific value (kcal/Nm3)?
    (A) Carbureted water gas
    (B) Gobar (cow dung) gas
    (C) Natural gas
    (D) LPG

15. Hard coke is manufactured from
    (A) Lignite
    (B) Bituminous coal
    (C) Semi-anthracite
    (D) Anthracite

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