Question 51 : The energy required per unit mass to grind limestone particles of very large size to 100 ?m is 17 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 ?rn is
1. 6.35 kWh/ton
2. 9.0 kWh/ton
3. 18 kWh/ton
4. 25.4 kWh/ton
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Question 52 : Which of the following mineral dressing operations is termed as 'comminution'?
1. Spiralling
2. Tabling
3. Panning
4. None of these
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Question 53 : Froth floatation is the most suitable for treating
1. none of these
2. sulphide ores
3. iron ores
4. quartzite
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Question 54 : Which of the following is not a part of the Blake jaw crusher?
1. Pitman
2. Toggles
3. Check plates
4. Hanger
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Question 55 : If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the
1. sedimentation
2. flocculation
3. dispersion
4. centrifugation
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Question 56 : The capacity of a belt conveyor depends upon two factors. If one is the cross-section of the load, the other is the __________ of the belt.
1. speed
2. length
3. none of these
4. thickness
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Question 57 : Gravity settling process is not involved in the working of a
1. dorr-thickener
2. sedimentation tank
3. hydrocyclone
4. classifier
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Question 58 : Filter aid is used to
1. decrease the pressure drop.
2. increase the rate of filtration.
3. increase the porosity of the cake.
4. act as a support base for the septum.
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Question 59 : Size reduction of __________ is accomplished in steam heated rollers and roll crushers.
1. resins
2. waxes
3. gums
4. hard rubber
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Question 60 : In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is
1. 1/4
2. 2
3. 1/2
4. 4
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