A. Recarbonising steel
B. Making carbon electrodes
C. Blending with highly coking coal to check its swelling which helps in saving coke even walls
from damage and to produce high strength coke
D. All A., B. and C.
Related Mcqs:
- Calorific value of a typical dry anthracite coal may be around _____________ Kcal/kg?
A. 1000
B. 4000
C. 8000
D. 15000 - Efficient burning of anthracite coal requires______________________?
A. Low preheat of air
B. Fine grinding
C. High excess air
D. All A., B. and C - Ignition temperature decreases progressively from anthracite to lignite, because___________________?
A. Volatile matter content increases
B. Carbon content decreases
C. Moisture content increases
D. Ash content increases - Anthracite coal ____________________?
A. Contains more volatile matter than bituminous coal
B. Ignites more easily than bituminous coal
C. Is essentially a coking coal
D. Burns with short, bluish, yellow-tipped flame producing very little smoke - Gross & net calorific value is the same for___________________?
A. Blast furnace gas
B. Coke oven gas
C. L.D. converter gas
D. None of these - In low temperature carbonisation of coal, the________________?
A. Yield of coke oven gas is 290 Nm3 /ton dry coal
B. Volatile matter in coke is zero
C. Temperature maintained is 700°C
D. Yield of tar is about 3% of dry coal - A coal that softens and fuses on heating is_________________?
A. Classified
B. Carbonised
C. Caking
D. Non-caking - Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm3 gas ?
A. Blast furnace gas
B. Natural gas
C. Producer gas
D. Water gas - Yield of blast furnace gas is about _______________ Nm3 /ton of pig iron?
A. 300
B. 2000
C. 5000
D. 10000 - Coke oven gas compared to blast furnace gas is________________?
A. More explosive and inflammable
B. Less poisonous
C. Lighter
D. All A., B. and C.
