‘Fat coals’ are those coals which have very high____________________?

Related Mcqs:

1. Very ______________ coals are completely devoid of cokability i.e., it is non-coking ?

   A. Young
   B. Mature
   C. Both A & B
   D. Neither A nor B

2. Coals used for the generation of producer gas should have ____________________?

   A. High caking index
   B. Low fusion point of ash
   C. High volatile matter content
   D. Very low ash content (8-10%)

3. Coking coals are invariably____________________?

   A. Lignites
   B. Bituminous coals
   C. Semi-anthracites
   D. Anthracites

4. Assam (India) coals suffers mainly from the disadvantage of high ______________ content?

   A. Ash
   B. Volatile matter
   C. Sulphur (4-6%)
   D. Moisture

5. High ash coals ____________________?

   A. Are soft & friable (poor strength and size stability)
   B. Require longer time of carbonisation as ash offers resistance to heat transfer
   C. Produce larger quantity of coke oven gas
   D. None of these

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

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

7. Initial pressure of oxygen introduced into the ‘bomb’ of the bomb calorimeter for determination of calorific value of coal/fuel oil may be around _____________ atm?

   A. 3-5
   B. 25-30
   C. 60-65
   D. 95-100

8. Which of the following has the highest theoretical flame temperature ?

   A. Blast furnace gas
   B. Hydrogen
   C. Acetylene
   D. Coke oven gas

9. Presence of ______________ in a dry gaseous fuel does not contribute to its calorific value?

   A. Sulphur
   B. Oxygen
   C. Hydrogen
   D. Carbon

10. Yield of charcoal in high temperature carbonisation of wood is about _____________ percent?

    A. 10
    B. 25
    C. 50
    D. 75