Fuels and Combustion in Chemical Engineering MCQ - Set 17 - ObjectiveBooks
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Fuels and Combustion in Chemical Engineering MCQ - Set 17

Practice Test: Question Set - 17


1. Softening temperature of coal ash is a measure of the __________ of coal.
    (A) Caking tendency
    (B) Coking tendency
    (C) Clinkering tendency
    (D) Size stability

2. The advantage of firing pulverized coal in the furnace lies in the fact, that it
    (A) Permits the use of high ash content coal
    (B) Permits the use of low fusion point ash coal
    (C) Accelerates the burning rate and economizes on fuel combustion
    (D) All (a), (b) and (c)

3. Calorific value of coke even gas produced by low temperature carbonization of coal is about __________ Kcal/Nm3.
    (A) 4000
    (B) 2500
    (C) 6500
    (D) 10000

4. Function of secondary air in pulverized coal firing is to
    (A) Transport the coal to the burner
    (B) Dry the coal
    (C) Ensure efficient burning of coal around the burner
    (D) Reduce primary air requirement

5. During combustion of coal on grate, clinker formation is increased by the
    (A) Use of thick fire bed
    (B) Low fusion point of ash (< 1100° C)
    (C) Use of preheated primary air
    (D) All (a), (b) & (c)

6. A coal having higher volatile matter content will necessarily have lower
    (A) Ash fusion temperature
    (B) Calorific value
    (C) Ignition temperature
    (D) Caking index

7. Short/intense flame is produced during combustion of gaseous fuel by using
    (A) High amount/current of combustion air
    (B) Low amount/current of combustion air
    (C) Preheated secondary air
    (D) Very little excess air

8. High sulphur (4-6%) coal in India are found in
    (A) Assam
    (B) Andhra Pradesh
    (C) Bengal
    (D) Madhya Pradesh

9. The calorific value of producer gas is around __________ kcal/Nm3.
    (A) 1300
    (B) 500
    (C) 4500
    (D) 9000

10. Heat penetration rate in narrow coke ovens in high temperature carbonization of coal is around __________ cm/hr.
    (A) 2.5
    (B) 0.5
    (C) 10
    (D) 20

11. Which is the heaviest fuel gas out of the following?
    (A) Blast furnace gas
    (B) Coke oven gas
    (C) Water gas
    (D) Carbureted water gas

12. Low temperature carbonization of coal produces
    (A) Metallurgical coke
    (B) Soft coke
    (C) Very low calorific value coke oven gas
    (D) No by-products

13. Presence of phosphorous in metallurgical coal
    (A) Is not undesirable
    (B) Reduces its calorific value
    (C) Badly affects the quality of steel
    (D) Increases its caking power

14. For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will
    (A) Increase
    (B) Decrease
    (C) Increase or decrease depending on the fuel type
    (D) Not change

15. The reaction, C + CO2 ↔ 2CO, taking place during coal gasification is called the __________ reaction.
    (A) Neumann reversal
    (B) Shift conversion
    (C) Boudouard
    (D) Reduction

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