Fuels and Combustion Objective Test Questions - Set 01 - ObjectiveBooks

Fuels and Combustion Objective Test Questions - Set 01

Practice Test: Question Set - 01

1. Combustion of pulverised fuel
    (A) Requires larger combustion chamber than rich gaseous fuel
    (B) In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel
    (C) Suppresses the discharge of fine dust and grit into atmosphere
    (D) All (a), (b) and (c)

2. Caking index of a coal is a measure of its
    (A) Abradability
    (B) Reactivity
    (C) Agglutinating (binding) properties
    (D) Porosity

3. White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is
    (A) Tar
    (B) Coke oven gas
    (C) Pitch
    (D) Pulverised coke

4. Main component of sewage gas produced during anaerobic decomposition of organic waste (by suitable bacteria) during sewage disposal is
    (A) H2
    (B) CH4
    (C) CO2
    (D) N2

5. Spontaneous combustion of coal on storage results due to
    (A) Inadequate ventilation
    (B) Low temperature oxidation
    (C) Storage in large heaps with small surface to volume ratio
    (D) All (a), (b) and (c)

6. The shift conversion reaction taking place during water gas manufacture is given by
    (A) C + H2O ↔ CO + H2
    (B) C + 2H2O ↔ CO2 + 2H2
    (C) CO + H2O ↔ CO2 + H2
    (D) None of these

7. 'Wobbe index' is a characteristic of
    (A) Solid fuels
    (B) Gaseous fuels
    (C) Liquid fuels
    (D) Fat coals

8. __________ of the coal is the basis for Seylor's coal classification.
    (A) Proximate analysis
    (B) Ultimate analysis
    (C) Caking index
    (D) Calorific value

9. In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
    (A) Transportation of coal
    (B) Drying of coal
    (C) Combustion of coal by supplying it around the burner
    (D) Preheating the primary air

10. The optimum percentage of excess air for combustion depends upon the __________ of the fuel.
    (A) Type (solid, liquid or gaseous)
    (B) Calorific value
    (C) Sulphur content
    (D) Ignition temperature

11. In flue gas analysis by Orsat's apparatus, carbon monoxide is absorbed by
    (A) Cuprous chloride
    (B) Potassium hydroxide
    (C) Alkaline pyrogallol solution
    (D) None of these

12. Presence of free moisture in coal during its high temperature carbonisation
    (A) Reduces the coking time
    (B) Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls
    (C) Increases the loss of fine coal dust from the ovens when charging
    (D) None of these

13. Washing of coal decreases its
    (A) Caking index
    (B) Mineral matter content
    (C) Ash content
    (D) Both (b) and (c)

14. In high temperature carbonisation of coal compared to low temperature carbonisation
    (A) Yield of ammonia is less
    (B) Aromatic content of tar is low
    (C) H2 content in the coke oven gas is more
    (D) Calorific value of the coke oven gas is lower

15. To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in
    (A) Shallow and small piles
    (B) Fine sizes without the presence of any lump
    (C) Closed space without any ventilation facility
    (D) Large heaps with small surface to volume ratio

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