A. Transportation and handling
B. Washing
C. Pulverisation
D. Storage
Related Mcqs:
- Presence of free moisture in coal is most disadvantageous during_________________?
A. Its pulverisation (as it requires more power)
B. Combustion of fire slacks on the grates
C. Handling (e.g. when emptying wagons)
D. None of these - Presence of free moisture in coal during its high temperature carbonisation _____________________?
A. Reduces the coking time
B. Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot
oven walls
C. Increases the loss of fine coal dust from the ovens when charging
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 - ombustion of pulverised coal compared to the lumpy coal __________________?
CA. Provides better control of furnace temperature
B. Facilitates combustion with lower excess air
C. Provides higher thermal efficiency & flame temperature
D. All A., B. & C. - Coal is heated in presence of air to a temperature of about _______________ °C, while determining its ash content for proximate analysis?
A. 500
B. 750
C. 950
D. 1100 - With increase in moisture content of coal, its___________________?
A. Calorific value increases
B. Caking properties diminish
C. Swelling during carbonisation becomes excessive
D. None of these - With increase in moisture content of coal, its_____________________?
A. Calorific value increases sometimes
B. Bulk density always decreases
C. Clinkering tendency during combustion increases
D. None of these - As the equilibrium moisture content of the coal increases, its___________________?
A. Calorific value increases
B. Swelling number decreases
C. Swelling number increases
D. Bulk density decreases - During its calorific value determination by bomb calorimeter, coal is combusted by _________________?
A. Air
B. Oxygen
C. Oxygen enriched air
D. None of these - Coal is heated in absence of air for 7 minutes at a temperature of about ______________ °C, during its volatile matter determination for proximate analysis?
A. 550
B. 750
C. 950
D. 1150
