Fuels Combustion Kinetics Chemical Engineering - Set 20 - ObjectiveBooks

Fuels Combustion Kinetics Chemical Engineering - Set 20

Practice Test: Question Set - 20

1. Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of
    (A) Less air for combustion
    (B) Correct amount of air for combustion
    (C) Too much air for combustion
    (D) Pulverized coal in boilers

2. The maximum percentage of CO2 in a flue gas (from a carbonaceous fuel) can be
    (A) 21
    (B) 77
    (C) 79
    (D) 29

3. Yield of blast furnace gas is about __________ Nm3 /ton of pig iron.
    (A) 300
    (B) 2000
    (C) 5000
    (D) 10000

4. Proximate analysis of coal determines its __________ content.
    (A) Moisture, ash, sulphur & volatile matter
    (B) Moisture, volatile matter, ash & fixed carbon
    (C) Moisture, sulphur, nitrogen & fixed carbon
    (D) None of these

5. Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces
    (A) Higher amount of methane
    (B) Lower amount of hydrogen
    (C) Both (a) and (b)
    (D) Higher amount of both methane and hydrogen

6. The cooling medium used in dry quenching of coke is
    (A) Nitrogen
    (B) Air
    (C) Phenolic water
    (D) Carbon dioxide

7. Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximate analysis.
    (A) 550
    (B) 750
    (C) 950
    (D) 1150

8. Fuel consumption in coke making can be reduced by
    (A) Preheating, blending and de-ashing the coal
    (B) Stamped charging of coal
    (C) Dry quenching of coke
    (D) All (a), (b) and (c)

9. Moisture loss is determined by the
    (A) Humidity of combustion air
    (B) Moisture content of fuel
    (C) Both (a) and (b)
    (D) The water formed by combustion reaction

10. Shatter index of the coke is a measure of its
    (A) Strength
    (B) Bulk density
    (C) Reactivity
    (D) None of these

11. High ash coals
    (A) Are soft & friable (poor strength and size stability)
    (B) Require longer time of carbonization as ash offers resistance to heat transfer
    (C) Produce larger quantity of coke oven gas
    (D) None of these

12. Orsat apparatus
    (A) Gives flue gas analysis on dry basis
    (B) Determines N2 in flue gas indirectly
    (C) Can’t determine CO in flue gas, if it is < 0.2%
    (D) All (a), (b) & (c)

13. Presence of force moisture in coal is most disadvantageous during its
    (A) Transportation and handling
    (B) Washing
    (C) Pulverization
    (D) Storage

14. Calorific value of tar is about __________ Kcal/kg.
    (A) 8800
    (B) 12000
    (C) 14000
    (D) 16000

15. If CO2 is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as
    (A) O2
    (B) CO
    (C) N2
    (D) SO2

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