Related Questions

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 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
Washing of coal is done to reduce the
A Inherent impurities
B Adhering impurities
C Mineral matter
D Both B and C
After taking 30 socks out of the washing machine, Shamim noticed that the ratio of blue socks to brown socks to black socks was 2:3:5. How many black socks were in the washing machine?
A 21
B 15
C 9
D 6
During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration
A At time zero
B At the end of filtration
C When half the filtrate has been obtained
D At the end of filtration, but decreases with time subsequently
In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is
A 4
B $$\frac{1}{4}$$
C 1
D $$\frac{1}{2}$$
The ratio for the rate of washing to the final rate of filtration in a washing type of plate and frame filter is
A 0.25
B 0.50
C 0.75
D 1.25
Washing of coal decreases its
A Caking index
B Mineral matter content
C Ash content
D Both B and C
Washing of coal is done to
A Remove the inherent impurities
B Remove the adhering impurities
C Reduce the ash content
D Both B and C
Washing of coal
A Reduces its sulphur and ash content
B Controls its ash fusibility and increases its calorific value
C Improves its coking properties
D All of the above

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