Question 1 : Cement clinker is reduced to fine size by a
1. hammer mill
2. ball mill
3. roll crusher
4. tube mill
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Question 2 : __________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals.
1. Selectivity index
2. Separation efficiency
3. Concentration ratio
4. none of these
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Question 3 : Which of the following agitators having a large blade area, rotating at slow speed is used for mixing high viscosity liquids ( > 50000 centipoise) ?
1. Propeller
2. Flat blade turbine
3. Helical screw
4. Curved blade turbine
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Question 4 : The crushed material received for separation is called feed or
1. tailing
2. heading
3. concentrate
4. middling
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Question 5 : The resistance offered by the filter used in a bag filter is proportional to (where, c = dust concentration, and s = particle size )
1. c/s
2. s/c
3. s . c
4. 1/s . c
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Question 6 : Crushing efficiency is the ratio of the
1. surface energy created by crushing to the energy absorbed by the solid.
2. energy absorbed by the solid to that fed to the machine.
3. energy fed to the machine to the surface energy created by crushing.
4. energy absorbed by the solid to the surface energy created by crushing.
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Question 7 : Which of the following is used for primary crushing of very hard lumpy materials ?
1. Toothed roll crusher
2. Ball mill
3. Gyratory crusher
4. Tube mill
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Question 8 : In case of a ball mill,
1. none of these
2. fine feed requires a larger ball.
3. coarse feed requires a larger ball.
4. operating speed should be more than the critical speed.
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Question 9 : The controlling resistance in a rotary drum vacuum filter is the __________ resistance.
1. filter medium
2. cake
3. piping
4. none of these
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Question 10 : Flow of filtrate through the cake in a plate and frame filter press is best described by the __________ equation.
1. Kozney-Karman
2. Hagen-Poiseulle's
3. Fanning's
4. Kremser
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