A. High caking index
B. Low fusion point of ash
C. High volatile matter content
D. Very low ash content (8-10%)
Related Mcqs:
- ‘Fat coals’ are those coals which have very high____________________?
A. Caking capacity
B. Volatile matter content
C. Fusion point of its ash
D. Inherent moisture content - Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is _______________ percent?
A. 71%
C. In between 37 & 71%
D. None of these - 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 - 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 - Coking coals are invariably____________________?
A. Lignites
B. Bituminous coals
C. Semi-anthracites
D. Anthracites - Assam (India) coals suffers mainly from the disadvantage of high ______________ content?
A. Ash
B. Volatile matter
C. Sulphur (4-6%)
D. Moisture - Which of the following is unsuitable fuel for producer gas manufacture ?
A. Coke
B. Anthracite
C. Coal having low fusion point of its ash
D. Coal having high fusion point of its ash - The calorific value of producer gas is around _____________ kcal/Nm3?
A. 1300
B. 500
C. 4500
D. 9000 - Producer gas comprises mainly of _______________________?
A. CO & N2
B. CO & H2
C. CO2 & N2
D. CO2 & H2 - Steam is intermittently admitted into the fuel bed during the production of producer gas to__________________?
A. Convert CO to CO2
B. Increase the combustion rate
C. Increase the gas production rate
D. Minimise the chances of clinker formation
