A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the ‘carpet loss’. The carpet loss may be of the order of ______________ cms?

Related Mcqs:

1. A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon _________________?

   A. Is less liable to spontaneous combustion on storage
   B. Is more difficult to ignite and produces a shorter flame
   C. Requires smaller combustion space and less secondary air
   D. None of these

2. Calorific value of coal middling generated in coal washeries during washing of coal may be around _____________ Kcal/kg?

   A. 1000
   B. 4000
   C. 6000
   D. 8000

3. ‘Wind loss’ resulting from unscientific storage of coal may be the order of about _____________ percent?

   A. 2.5
   B. 7.5
   C. 10.5
   D. 14.5

4. ‘Fat’ coal means a coal having ___________________?

   A. Low calorific value
   B. High volatile matter
   C. Low ash content
   D. Non smoking tendency

5. Gas yield in the Kopper-Totzek coal gasifier is about ______________ Nm3/ton coal (ash = 35%)?

   A. 150
   B. 1500
   C. 3500
   D. 5000

6. Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an ______________ bed gasifier?

   A. Entrained
   B. Moving
   C. Fixed
   D. Fluidised

7. A coal containing very high percentage of durain is called ______________ coal?

   A. Bright
   B. Splint
   C. Non-banded
   D. Boghead

8. Yield of coke oven gas in low temperature carbonisation of coal is about ______________ Nm3 /ton of dry coal?

   A. 60
   B. 160
   C. 500
   D. 750

9. Ash content in the coke produced from a coking coal having 20% ash may be around _____________ percent?

   A. 6
   B. 12
   C. 18
   D. 24

10. To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in___________________?

    A. Shallow and small piles
    B. Fine sizes without the presence of any lump
    C. Closed space without any ventilation facility
    D. Large heaps with small surface to volume ratio