Fuel Combustion of Ethanol Chemical Engineering Test - Set 22 - ObjectiveBooks
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Fuel Combustion of Ethanol Chemical Engineering Test - Set 22

Practice Test: Question Set - 22


1. A good quality coal should have
    (A) Low fusion point of ash
    (B) High ash content
    (C) High sulphur
    (D) None of these

2. Coke oven gas is stripped of its H2S and mercaptans content by
    (A) Absorption in wash oil
    (B) Adsorption on bog iron bed
    (C) Bubbling it through dilute sulphuric acid
    (D) Adsorption on silica gel

3. Out of the following fuels, the difference between gross and net calorific value will be minimum in case of
    (A) Coke oven gas
    (B) Water gas
    (C) Natural gas
    (D) Blast furnace gas

4. For long flame and easy ignition, the coal used should have
    (A) High volatile matter
    (B) Low ash
    (C) High calorific value
    (D) High ash

5. When the coal is heated in absence of air, it is called its
    (A) Deoxidation
    (B) Gasification
    (C) Coalification
    (D) Carbonization

6. Quantity of coke oven gas produced by high temperature carbonization of one ton of dry coal may be around __________ Nm3.
    (A) 30
    (B) 300
    (C) 3,000
    (D) 30,000

7. High temperature carbonization of coal takes place at __________ °C.
    (A) 2000
    (B) 600
    (C) 1100
    (D) 1600

8. The gasification reaction represented by, C + H2O = CO + H2, is
    (A) Exothermic
    (B) Endothermic
    (C) Catalytic
    (D) Autocatalytic

9. With increase in C/H ratio of a fuel, the dew point of flue gases
    (A) Increases
    (B) Decreases
    (C) Remain same
    (D) May increase or decrease; depends on the type of fuel

10. The calorific value of a gas of composition CO2 = 20%, H2 = 50%, CH4 = 30%, is y. If the composition of gas is changed to H2 = 50%, CH4 = 30%, CO2 = 10%, N2 = 10%, then the calorific value will be
    (A) y
    (B) 0.95 y
    (C) 1.05 y
    (D) 1.8 y

11. Coking time in a commercial high temperature coal carbonization plant is about __________ hours.
    (A) 6
    (B) 18
    (C) 28
    (D) 36

12. C/H ratio is the minimum in case of
    (A) Furnace oil
    (B) Natural gas
    (C) Coal
    (D) Naphtha

13. Which of the following would require maximum amount of % excess air for complete combustion?
    (A) Coke oven gas
    (B) Furnace oil
    (C) Pulverized coal
    (D) Lump coal (fixed on chain grate)

14. Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?
    (A) Ash disposal problem
    (B) Excessive fly-ash discharge from the stack
    (C) High power consumption in its transportation
    (D) Erosion of induced draft fan blades

15. Which of the following is not a micro component present in coal?
    (A) Micrinite
    (B) Clarain
    (C) Fusinite
    (D) Liptinite

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