Which of the following is the hardest material ?
Which of the following is the hardest material ?
A. Calcite
B. Quartz
C. Corundum
D. Gypsum
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Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively ?
Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively ?A. 200°C and 5 atm
B. 1000°C and 10 atm
C. 500°C and 50 atm
D. 1000°C and 500 atmShell and leaf filter as compared to plate and frame filter _____________________?
Shell and leaf filter as compared to plate and frame filter _____________________?A. Entails less labor cost
B. Facilitates filtration under higher pressure
C. Provides more effective washing
D. All A., B. & C.A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is_________________?
A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is_________________?A. 0.50
B. 0.58
C. 0.68
D. 0.62The work index in Bond’s law for crushing of solids has the following dimensions__________________?
The work index in Bond’s law for crushing of solids has the following dimensions__________________?A. No units (dimensionless)
B. kWh/ton
C. kW/ton
D. kWh.m1/2/tonAccording to Taggart’s rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than_______________?
According to Taggart’s rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than_______________?A. 0.00184
B. 0.0184
C. 0.184
D. 1.84The energy consumed by a ball mill depends on__________________?
The energy consumed by a ball mill depends on__________________?A. Its speed
B. Its ball load
C. The density of the material being ground
D. All A., B. and C.