Related Mcqs:

1. 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?

   A. 1 to 2
   B. 3 to 4
   C. 5 to 15
   D. 20 to 40

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. Low temperature oxidation of coal resulting from bad storage conditions does not decrease its______________________?

   A. Caking power
   B. Calorific value
   C. Hydrogen content
   D. Oxygen content

4. When steam is passed over coal resulting in the endothermic reaction represent by, C + H2O = CO + H2, it is called the _______________ of coal?

   A. Carbonisation
   B. Oxidation
   C. Coalification
   D. Gasification

5. Volatile matter content in coking coal may be about _____________ percent?

   A. 1
   B. 7
   C. 22
   D. 46

6. 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

7. Quantity of coke produced from metallurgical coal may be around _____________ percent?

   A. 30
   B. 50
   C. 75
   D. 95

8. Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively ______________ percent?

   A. 3 & 10
   B. 10 & 3
   C. 10 & 20
   D. 15 & 8

9. _____________ of the coal is the basis for Seylor’s coal classification?

   A. Proximate analysis
   B. Ultimate analysis
   C. Caking index
   D. Calorific value

10. Softening temperature of coal ash is a measure of the _____________ of coal?

    A. Caking tendency
    B. Coking tendency
    C. Clinkering tendency
    D. Size stability