Related Questions

Which one of the following processes of weathering belongs to both mechanical and chemical weathering?
A Crystallization
B Exfoliation
C Hydration
D Carbonation
Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its
A friability & oxygen content
B caking index
C yield of carbonized products
D calorific value
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
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
Which of the following does not require preheating during storage in the storage tank as well as during atomisation through burners?
A PCM
B Tar
C Light diesel oil
D Low viscosity furnace oil
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is
A Neutralised by alkali treatment
B Left as such without any treatment
C Diluted with fresh water to reduce its acidity
D None of these
Low temperature oxidation of coal during storage does not decrease its
A Oxygen content
B Caking power
C Calorific value
D None of these
During storage, the heating value of coal
A Increases
B Decreases
C Remain constant
D May increase or decrease depending upon the method of storage
Which of the following is not a type of chemical weathering?
A Corrosion
B Solution
C Oxidation
D Carbonation
________ influences the rate of weathering and humus in soil formation.
A Flora & Fauna
B Time
C Parent rock
D Climate

Next steps