Fuels and Combustion Problems with Solution - Set 24 - ObjectiveBooks

Fuels and Combustion Problems with Solution - Set 24

Practice Test: Question Set - 24

1. Calorific value as determined by bomb calorimeter is the
    (A) Higher calorific value at constant volume
    (B) Gross calorific value at constant pressure
    (C) Lower calorific value at constant pressure
    (D) Net calorific value at constant volume

2. High pressure coal gasification is employed in __________ process.
    (A) Lurgi
    (B) Kopper-Totzek
    (C) Winkler
    (D) None of these

3. Calorific value of gobar gas (containing CH4 = 60% , H2 = 10% ; CO2 = 30%) may be about __________ Kcal/Nm3.
    (A) 1,800
    (B) 3,200
    (C) 5,400
    (D) 10,200

4. Lignite is
    (A) A high rank coal
    (B) A coking coal
    (C) Can be used for gasification and steam generation
    (D) A black banded coal which burns with a non-smoky yellowish flame

5. Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction?
    (A) 2CO ↔ C + CO2
    (B) CO + H2O ↔ CO2 + H2
    (C) C + H2O ↔ CO + H2
    (D) C + 2H2O ↔ CO2 + 2H2

6. The internal energy of the combustion products is __________ compared to that of reactants.
    (A) More
    (B) Less
    (C) Equal
    (D) More or less; (depends on the state of fuel.)

7. Coke oven gas compared to blast furnace gas is
    (A) More explosive and inflammable
    (B) Less poisonous
    (C) Lighter
    (D) All (a), (b) and (c)

8. Gross heating value of coal is __________ the net heating value.
    (A) Higher than
    (B) Lower than
    (C) Same as
    (D) None of these

9. Which of the following gaseous fuels is likely to have the highest gross calorific value?
    (A) Sewage gas
    (B) LPG
    (C) Producer gas
    (D) Natural gas

10. In high temperature carbonization (as compared to low temperature carbonization) of coal
    (A) Coke oven gas yield is more
    (B) Tar yield is less but free carbon in tar is more
    (C) Calorific value of coke oven gas is less
    (D) All (a), (b) and (c)

11. Pick out the wrong statement.
    (A) LPG is also used as fuel for automobiles & small furnaces and for cutting & welding of metals
    (B) The minimum temperature, at which a petroleum oil vapor catches fire and continues to burn, is called its flash point
    (C) Each ton of petroleum oil on distillation produces about 30-50 Nm3 of gas
    (D) Maximum yield of naphthalene is obtained on distillation of crude oil

12. The difference between total carbon and fixed carbon of coal will be minimum in case of
    (A) Lignite
    (B) Bituminous coal
    (C) Anthracite
    (D) High temperature coke (V.M < 0.5%)

13. Mineral matter content (M) and ash content (A) in coal are approximately related as
    (A) M = 1.1A
    (B) M = A
    (C) M = 1.5A
    (D) M = 2A

14. Increase in ash content of blast furnace coke
    (A) Reduces its consumption in the furnace
    (B) Increases its consumption in the furnace
    (C) Does not affect its consumption in the furnace
    (D) Decreases its hardness and abrasion resistance

15. Preheating of a gaseous fuel results in increased
    (A) Flame length
    (B) Flame temperature
    (C) Quantity of flue gas
    (D) Ignition temperature

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