Fuel and Combustion Reaction Questions with Answers - Set 28 - ObjectiveBooks

Fuel and Combustion Reaction Questions with Answers - Set 28

Practice Test: Question Set - 28

1. Ratio of primary air to secondary air increases with increase in the rank of coal, because the
    (A) High rank coals have higher amount of volatile matter
    (B) Ratio of fixed carbon to volatile matter increases
    (C) Oxygen content progressively decreases
    (D) Calorific value of the coal increases

2. Coal tar fuel - 200 (CTF 200) is a mixture of
    (A) Pitch and creosote oil
    (B) Light oil and pitch
    (C) Anthracene and crecosote oil
    (D) Solar oil and pitch

3. Coking coals are invariably
    (A) Lignites
    (B) Bituminous coals
    (C) Semi-anthracites
    (D) Anthracites

4. During coal carbonization process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass.
    (A) Density
    (B) Porosity
    (C) Electrical resistivity
    (D) None of these

5. Volatile matter content of metallurgical coke may be around __________ percent.
    (A) 1-2
    (B) 10-15
    (C) 22-26
    (D) 30-33

6. Combustion of pulverized coal as compared to that of lump coal
    (A) Develops a non-luminous flame
    (B) Develops a low temperature flame
    (C) Can be done with less excess air
    (D) Provides a lower rate of heat release

7. C.V. (kcal/Nm3) of gaseous fuels __________ with increase in molecular weight.
    (A) Decreases
    (B) Increases
    (C) Remain constant
    (D) May increase or decrease, depends on combustibles

8. Calorific value of dry wood may be around __________ Kcal/kg.
    (A) 5
    (B) 50
    (C) 500
    (D) 5000

9. Fuel for a fast breeder nuclear reactor is
    (A) Plutonium
    (B) Uranium
    (C) Radium
    (D) Neptunium

10. Mineral matter, 'M' and ash percentage 'A' in coal are roughly related as
    (A) M = 1.8 A
    (B) M = 0.5 A
    (C) M = 1.1 A
    (D) M = A

11. Actual flame temperature is always lower than the adiabatic flame temperature, because there is
    (A) No possibility of obtaining complete combustion at high temperature
    (B) Always loss of heat from the flame
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

12. Flue gas from the heating chamber of byproduct coke ovens is removed by
    (A) Forced draft fan
    (B) Induced draft fan
    (C) Steam ejector
    (D) Natural draft

13. 'Fuel' can be defined as a substance which produces heat by
    (A) Combustion
    (B) Nuclear fission
    (C) Nuclear fusion
    (D) All (a), (b) & (c)

14. Safe condition for storage of high V.M. bituminous coal is that
    (A) Height of the coal heap should be < 3 meters
    (B) Maximum 200 tons should be stored in a heap
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

15. Bomb calorimeter is used to determine the (where, GCV - Gross Calorific Value. NCV - Net Calorific Value.)
    (A) GCV at constant pressure
    (B) GCV at constant volume
    (C) NCV at constant pressure
    (D) NCV at constant volume

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