A. Contains more than 90% durain
B. Contains more than 90% fussain
C. Contains mainly vitrain & clarain and is generally coking
D. Is non-coking
Related Mcqs:
- In low temperature carbonisation (as compared to high temperature carbonisation) of coal__________________?
A. Ammonia yield is more
B. Aliphatic tar is produced
C. Free carbon in tar is more
D. All A., B. and C. - Presence of phosphorous in metallurgical coal__________________?
A. Is not undesirable
B. Reduces its calorific value
C. Badly affects the quality of steel
D. Increases its caking power - Cannel coal__________________?
A. Is non-coking
B. Has a high volatile matter content and burns with a luminous smoky flame
C. Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is
so named
D. All A., B. and C. - Sulphur in metallurgical coal__________________?
A. Contributes to its heating value
B. Affects the quality of steel produced as cracks develop on the surface while rolling the steel
C. Both A. and B.
D. Neither A. nor B. - During the carbonisation of coal__________________?
A. All tar is evolved at 700°C
C. Hard semi-coke starts shrinking at 600°C
D. All A., B. and C. - The bright glow of a combustion process is the characteristic of ______________ temperature oxidation of coal?
A. Fast & high
B. Slow & low
C. Slow & high
D. Fast & slow - Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal ?
A. Vitrain
B. Clarain
C. Durain
D. Fussain - Main constituent of the gas produced from a gobar gas plant is___________________?
A. CO2
B. CH4
C. H2
D. CO - ‘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 - Pick out the wrong statement ?
A. Cokes of high reactivity are obtained from weakly coking coals
B. Cokes of high reactivity are obtained from strongly coking coals
C. Reactivity of coke is inversely proportional to its absolute density
D. Abrasion index of the coke is a measure of its hardness
