Fuel combustion Hydrocarbons Online Practice Test - Set 14 - ObjectiveBooks

Fuel combustion Hydrocarbons Online Practice Test - Set 14

Practice Test: Question Set - 14

1. Stack (chimney) height in a big thermal power plant is dictated by the
    (A) Pollution control aspect
    (B) Draught to be created
    (C) Limitation of constructional facilities
    (D) None of these

2. Coke having higher porosity has
    (A) Lower bulk density
    (B) Lower strength
    (C) Higher reactivity
    (D) All (a), (b) and (c)

3. During coking of coal, the ash content (percentage)
    (A) Increases
    (B) Decreases
    (C) Remain constant
    (D) None of these

4. Out of the following, which is the most important parameter for the blast furnace grade coke?
    (A) CSR & CRI
    (B) Ash content
    (C) Moisture content
    (D) Volatile matter content

5. Percentage of nitrogen in blast furnace gas may be around
    (A) 5
    (B) 25
    (C) 55
    (D) 80

6. Artificial draught produced by a fan can be controlled by the
    (A) Speed of the fan
    (B) Damper
    (C) Variation in the pitch of the fan blades
    (D) All (a), (b) and (c)

7. In low temperature carbonization of coal as compared to high temperature carbonization __________ produced is less.
    (A) Difference in gross & net calorific value of the coke oven gas
    (B) Free carbon content in tar
    (C) Yield percentage of coke
    (D) Yield of ammonia present in coke oven gas

8. Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverized coal fired boiler?
    (A) Multicyclones
    (B) Bag filter
    (C) Wet scrubber
    (D) Hydrocyclones

9. The pyrogallol solution used in Orsat apparatus can absorb
    (A) Only O2
    (B) Both O2 and CO2
    (C) Both O2 and CO
    (D) All CO, CO2, and O2

10. In low temperature carbonization (as compared to high temperature carbonization) of coal
    (A) Ammonia yield is more
    (B) Aliphatic tar is produced
    (C) Free carbon in tar is more
    (D) All (a), (b) and (c)

11. A fuel with high heat release rate will
    (A) Require smaller combustion chamber
    (B) Have high calorific value
    (C) Have high adiabatic flame temperature
    (D) None of these

12. Tar is a better fuel than furnace oil, because of its
    (A) Higher calorific value
    (B) Lower sulphur content
    (C) Higher emissivity (0.8 - 0.9) resulting in higher radiation heat transfer rate
    (D) Both (a) and (b)

13. A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of __________ cms.
    (A) 1 to 2
    (B) 3 to 4
    (C) 5 to 15
    (D) 20 to 40

14. __________ is used as jet engine fuel.
    (A) Petrol
    (B) Diesel
    (C) Kerosene
    (D) LPG

15. Bright coal
    (A) Contains more than 90% durain
    (B) Contains more than 90% fussain
    (C) Contains mainly vitrain & clarain and is generally coking
    (D) Is non-coking

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