Artificial draught produced by a fan can be controlled by the___________________?

Related Mcqs:

1. Natural draught produced by a chimney depends upon the _____________________?

   A. Density of the chimney gases
   B. Height of the chimney
   C. Both A. and B.
   D. Neither A. nor B.

2. Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has_________________?

   A. Higher calorific value
   B. Lower hydrogen content
   C. Both A. and B.
   D. Neither A. nor B.

3. Use of preheated air for combustion of fuel in the furnace, increases the___________________?

   A. Scale losses of the furnace stock
   B. Calorific value of the fuel
   C. Flame temperature
   D. None of these

4. 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.

5. Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the___________________?

   A. Requirement of large volume combustion chamber
   B. Risk of explosion
   C. Chances of clinker formation
   D. Incomplete combustion of coal

6. 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

7. L.D. converter gas (produced in steel plant) comprises mainly of ___________________?

   A. CO (upto 65%) & CO2
   B. CO2 & H2
   C. CO & O2
   D. CO2 & O2

8. Calorific value of coke even gas produced by low temperature carbonisation of coal is about ____________ Kcal/Nm3?

   A. 4000
   B. 2500
   C. 6500
   D. 10000

9. In low temperature carbonisation of coal as compared to high temperature carbonisation _____________ 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

10. Coal tar (produced by high temperature carbonization) is the main source of_________?

    A. Aromatic compounds
    B. Aliphatic compounds
    C. Paraffins
    D. Olefins

    Submitted by: Muhammad Mutsadiq Umer