Where unpulverised coal has to be used and boiler capacity is large, the stoker which is used is______________?

Related Mcqs:

1. Example of overfeed type stoker is___________?

   A. chain grate
   B. spreader
   C. travelling grate
   D. all of the above

2. TravelUng grate stoker can burn coals at the rates of____________?

   A. 50—75 kg/m per hour
   B. 75—100 kg/m per hour
   C. 100—150 kg/m per hour
   D. 150—200 kg/m2 per hour

3. The efficiency of a modern boiler using coal and heat recovery equipment is about_____________?

   A. 25 to 30%
   B. 40 to 50%
   C. 65 to 70%
   D. 85 to 90%

4. The capacity of large turbo-generators varies from___________?

   A. 20 to 100 MW
   B. 50 to 300 MW
   C. 70 to 400 MW
   D. 100 to 650 MW

5. In a boiler installation the natural draught is produced_____________?

   A. due to the fact that furnace gases being light go through the chimney giving place to cold air from outside to rush in
   B. due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column
   C. due to the fact that at the chimney top the pressure is more than its environmental pressure
   D. all of the above

6. For the safety of a steam boiler the number of safety valves fitted are____________?

   A. four
   B. three
   C. two
   D. one

7. Economisers improve boiler efficiency by__________?

   A. 1 to 5%
   B. 4 to 10%
   C. 10 to 12%

8. Blowing down of boiler water is the process_____________?

   A. to reduce the boiler pressure
   B. to increase the steam temperature
   C. to control the solid concentration in the boiler water by removing some of the concentrated saline water
   D. none of the above

9. Belt conveyer can be used to transport coal at inclinations upto____________?

   A. 30°
   B. 60°
   C. 80°
   D. 90°

10. Method which is commonly applied for unloading the coal for small power plant is___________?

    A. lift trucks
    B. coal accelerators
    C. tower cranes
    D. belt conveyor