A. Volatile matter content increases
B. Carbon content decreases
C. Moisture content increases
D. Ash content increases
Related Mcqs:
- Ignition temperature of a fuel in air is ______________ that in pure oxygen?
A. More than
B. Less than
C. Equal to
D. Either more or less; depends on the type of fuel - 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 - Anthracite can be used for___________________?
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. - 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 - Lignite is ___________________?
A. A high rank coal
B. A coking coal
C. Can be used for gasification and steam generation
D. A black banded coal which burns with a non-smoky yellowish flame - For long flame and easy ignition, the coal used should have_________________?
A. High volatile matter
B. Low ash
C. High calorific value
D. High ash - Washing of coal decreases its_________________?
A. Caking index
B. Mineral matter content
C. Ash content
D. Both B. and C. - With increase in the oxygen content of the coal, its ______________ decreases?
A. Calorific value
B. Caking power
C. Both A. & B.
D. Neither A. nor B. - In low temperature carbonisation of coal as compared to high temperature carbonisation _____________ produced is less?
A. Difference in gross & net calorific value of the coke oven gas
B. Free carbon content in tar
C. Yield percentage of coke
D. Yield of ammonia present in coke oven gas
