A. Reduces its sulphur and ash content
B. Controls its ash fusibility and increases its calorific value
C. Improves its coking properties
D. All A., B. and C.
Related Mcqs:
- The weathering index of a coal________________?
A. Gives an idea of the fusion temperature of ash
B. Is related to its calorific value
C. Is a measure of its size stability, when stored & exposed to weather
D. Is a measure of its caking tendency - Washing of coal decreases its_________________?
A. Caking index
B. Mineral matter content
C. Ash content
D. Both B. and C. - Washing of coal _________________?
A. Reduces its ash & sulphur content
B. Improves its coking properties
C. Increase the fusion point of its ash by removing chlorine compounds
D. All A., B. and C. - Washing of coal does not reduce its______________________?
A. S & P content
B. Heating value
C. Fusion point of ash
D. None of these - Calorific value of coal middling generated in coal washeries during washing of coal may be around _____________ Kcal/kg?
A. 1000
B. 4000
C. 6000
D. 8000 - Washing of coal is done to reduce the_________________?
A. Inherent impurities
B. Adhering impurities
C. Mineral matter
D. Both B. and C. - The liquid used for the washing of coal in an industrial coal washery is a mixture of water and ____________________?
A. Carbon tetrachloride
B. Sand (40%)
C. Mineral oil of high viscosity & specific gravity (1.6)
D. None of these - Spontaneous combustion of coal on storage results due to___________________?
A. Inadequate ventilation
B. Low temperature oxidation
C. Storage in large heaps with small surface to volume ratio
D. All A., B. and C. - Natural draught produced by a chimney depends upon the _____________________?
A. Density of the chimney gases
B. Height of the chimney
C. Both A. and B.
D. Neither A. nor B. - Main constituents of Benzol are ____________________?
A. Benzene, toluene & xylene
B. Tar & creosote
C. Ammonia & phenol
D. Anthracene & phenol
