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.Management Sciences
Category: Mechanical Operations
Ore concentration by jigging is based on the difference in the ______________ of the particles?
A. Specific gravities
B. Wettability
C. Shape
D. None of these
A propeller agitator_______________?
A. Produces mainly axial flow
B. Is used for mixing high viscosity pastes
C. Runs at very slow speed (2 rpm)
D. All A., B. and C.
In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of _______________ crushing?
A. Primary
B. Secondary
C. Fine
D. Ultrafine
For transporting pasty material, one will use a/an__________________?
A. Apron conveyor
B. Belt conveyor
C. Screw conveyor
D. Bucket elevator
Filter aid is used to____________________?
A. Increase the rate of filtration
B. Decrease the pressure drop
C. Increase the porosity of the cake
D. Act as a support base for the septum
Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre V = speed of the conveyor, metre/second ρ = bulk density of material, kg/m3) ?
A. 3.6 W.D.V.ρ
B. 3.6 W.D.V
C. 3.6 W.V.ρ
D. 3.6 D.V.ρ
In case of a revolving mill, wet grinding compared to dry grinding__________________?
A. Requires more energy
B. Has less capacity
C. Complicates handling & classification of the product
D. None of these
Trommels separate a mixture of particles depending on their_____________________?
A. Size
B. Density
C. Wettability
D. Electrical & magnetic properties
Screen capacity is expressed in terms of____________________?
A. tons/hr
B. tons/ft2
C. Both A. & B.
D. tons/hr-ft2
_____________ mills are termed as impactors?
A. Hammer
B. Cage
C. Rolling-compression
D. None of these
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