Question 61 : Two particles are called to be equal settling, if they are having the same.
1. specific gravity.
2. none of these.
3. terminal velocities in the same fluid & in the same field of force.
4. size
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Question 62 : The distribution given by microscopic analysis of powder is
1. length
2. number
3. area
4. volume
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Question 63 : Ball mills and tube mills with flint or porcelain balls are used for size reduction of
1. limestone
2. asbestos
3. rubber
4. non-metallic ores
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Question 64 : Pick out the wrong statement pertaining to the roll crushers.
1. Reduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced.
2. Both the rolls run necessarily at the same speed.
3. Maximum feed size determines the required roll diameter.
4. For hard material's crushing, the reduction ratio should not exceed
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Question 65 : For a non-spherical particle, the sphericity
1. is always less than
2. has the dimension of length.
3. is the ratio of volume of a sphere having the same surface area as the particle to the actual volume of the particle.
4. is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle.
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Question 66 : __________ centrifuge is normally used in sugar mills.
1. Perforated horizontal basket continuous
2. Suspended batch basket
3. Disc-bowl
4. Tubular bowl
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Question 67 : Solid particles separation based on the difference in their flow velocities through fluids is termed as the
1. elutriation
2. clarification
3. sedimentation
4. classification
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Question 68 : Diatomaceous earth is a/an
1. filter medium
2. filter aid
3. catalyst
4. explosive
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Question 69 : Which of the following is the most suitable for handling fibrous and dense slurries ?
1. Cone type agitator
2. Radial propeller agitator
3. Turbine agitator
4. Propeller agitator
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Question 70 : Tabular bowl centrifuges as compared to disk bowl centrifuges
1. employ bowl of larger diameter.
2. can not be operated under pressure/vacuum.
3. operate at higher speed.
4. can't be used for separation of fine suspended solids from a liquid.
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