Fuels and Combustion Important Questions - Set 16 - ObjectiveBooks
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Fuels and Combustion Important Questions - Set 16

Practice Test: Question Set - 16


1. Insitu theory and drift theory are related to the
    (A) Origin of petroleum oil
    (B) Origin of coal
    (C) Coalification
    (D) Variation of coal quality with depth

2. Gobar gas is produced by the __________ of 'gobar' (cow dung).
    (A) Hydrolysis
    (B) Fermentation
    (C) Oxidation
    (D) Dehydration

3. Washing of coal
    (A) Reduces its sulphur and ash content
    (B) Controls its ash fusibility and increases its calorific value
    (C) Improves its coking properties
    (D) All (a), (b) and (c)

4. Percentage of methane in coke oven gas may be around
    (A) 5
    (B) 15
    (C) 25
    (D) 50

5. A good metallurgical coke should have very low
    (A) Sulphur & phosphorous content
    (B) Porosity
    (C) Fusion point of its ash
    (D) Hardness & strength

6. A carbonaceous fuel (containing no H2 or hydrocarbons) is burnt and the resulting flue gas contains 21% CO2. It means that
    (A) 21% excess air has been used for combustion
    (B) 21% excess oxygen has been used for combustion
    (C) Complete combustion of fuel has taken place
    (D) No excess air has been used for combustion

7. For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3), while the C.V. is same on weight basis (i.e., kcal/kg)?
    (A) Propane and acetylene
    (B) Propane and LPG
    (C) Sewage gas and gobar (cow dung) gas
    (D) B.F. gas and coke oven gas

8. Which of the following combustibles is absent in blast furnace gas?
    (A) H2
    (B) CH4
    (C) CO
    (D) None of these

9. Ignition temperature decreases progressively from anthracite to lignite, because
    (A) Volatile matter content increases
    (B) Carbon content decreases
    (C) Moisture content increases
    (D) Ash content increases

10. Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ ppm.
    (A) 50
    (B) 1000
    (C) 5000
    (D) 10000

11. (64-132) rank coal (ASTM) means a coal with 64%
    (A) Fixed carbon and having a heat value of 13, 200 BTU/1b
    (B) Ash and a heating value of 13, 200 BTU/1b
    (C) Fixed carbon and a heating value of 132 BTU/1b
    (D) None of these

12. Higher fuel combustion efficiency cannot be achieved by
    (A) Preheating of fuel gases & combustion air
    (B) Reducing sulphur content in the fuel
    (C) Adopting proper fuel firing technique & fuel preparation
    (D) Supplying correct amount of combustion air

13. The most matured coal out of the following is
    (A) Lignite
    (B) Semi-anthracite
    (C) Sub-bituminous
    (D) Bituminous

14. A sample of natural gas containing 80% methane (CH4) and rest nitrogen (N2) is burnt with 20% excess air. With 80% of the combustibles producing CO2 and the remainder going to CO, the Orsat analysis in volume percent is
    (A) CO2 : 6.26, CO : 1.56, O2 : 3.91, H2O :15.66, N2 : 72.60
    (B) CO2 : 7.42, CO : 1.86, O2 : 4.64, N2:86.02
    (C) CO2 : 6.39, CO : 1.60, O2 : 3.99, H2O:25.96, N2:72.06
    (D) CO2 : 7.60, CO : 1.90, O2 : 4.75, N2 : 85.74

15. Calorific value of both the solid & liquid fuels can be determined by using __________ calorimeter.
    (A) Junker's
    (B) Bomb
    (C) Boy's
    (D) None of these

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