B. 16

C. 64

D. 52

B. None of these

C. Length

D. Thickness

B. Screw

C. Belt

D. Drag

A. ses a 200 mesh screen

C. product passes through a 100 micron screen</strong>

D. Energy needed to crush one tonne of feed to 200 microns

E. Energy needed to crush one ton of feed to 100 microns

F. Energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product

A. Np ? NRe

C. Np ? constant

D. Np ? ?NRe

A. Tube mills

B. Compartment mills

D. Ball mills

B. None of these

C. Feed size

D. Final particle size

B. Shape

C. Wettability

D. None of these

A. Cutting

C. Compression

D. Impact

A. Remains constant

C. None of these

D. Decreases gradually

A. Cod oil, beef tallow or aluminium stearates are used as grinding aids in cement industries

B. Size enlargement is a mechanical operation exemplified by medicinal tablet making

C. Close circuit grinding is more economical than open circuit grinding

A. Pine oil is used as a modifying agent (for activating or depressing the adsorption of filming

B. nts) in froth floatation process

C. Angle of repose is always greater than the angle of slide

D. ter coal

F. A silo is a short height vessel of very large diameter used for the storage of high volatile

A. Mixed

C. Separated by particle density

D. Separated by particle shape

A. Rate

B. Pressure

D. Neither A. nor B.

A. 1125

B. 460

C. 2250

A. D

B. 1/D

D. 1/D2.5

A. Roll crusher

B. Gyratory crusher

D. Hammer crusher

A. Bucket conveyor

B. Flight conveyor

C. Screw conveyor

A. Dust catcher

B. Rotary sprayer scrubber

C. Dry cyclone separator

A. m . Vp/?

B. Vp/m . ?

D. m . ?/Vp

A. Maximum porosity at the filter medium

C. None of these

D. Same porosity throughout the cake thickness

B. None of these

C. Strainer

D. Cyclone separator

A. Solids from solids

C. Liquids

D. Solids

A. Feed material

B. Type of crushing machine

D. Neither A. nor B.

A. Reduction ratio can be varied by adjusting the distance from cage to hammers

C. Crushing takes place by impact breaking

D. Maximum acceptable feed size is 30 cms

A. Clarification

B. Sizing

C. Dispersion

A. Rotary drum vacuum

C. Plate and frame

D. Sparkler

A. ?3

B. ?2

D. 0.5

A. None of these

B. Decreasing machine capacity

D. Decreasing size of product at constant size of feed

A. 1

B. 0.5

D. 2.76

A. Modifier

C. Activator

D. Frother

A. The operating cost of shaking screen is more than that of a vibrating screen

C. Asphalt is best crushed using toothed roll crusher

D. avoid discolouration of ceramic products</strong>

E. Screen capacity does not depend upon the specific gravity of the minerals

A. 20

B. 8

C. 12

A. Maximum feed size determines the required roll diameter

B. For hard materials crushing, the reduction ratio should not exceed 4

D. Reduction ratio and differential roll speed affect production rate & energy consumed per unit

E. surface produced

A. Densities

C. Particle sizes

D. None of these

A. (S/V)f

C. (S/V)p

D. (S/V)2p

A. The angle of nip (2?) is the angle between roll faces at the level where they will just take hold

B. duct

C. Gape is the greatest distance between the crushing surfaces or the jaws

D. a particle and draw it in the crushing zone

E. ated by crushing</strong>

F. Reduction ratio is the ratio of the maximum size of the particles in the feed to that in the

A. Micronizers

C. Hammer mills with internal classification

D. Agitated mills and fluid energy mills

A. blade length is l/4th of agitator diameter (with central disc, it is l/8th of the agitator

B. Turbine agitator should be located at a height not less than one agitator diameter length from

C. tators should be used

E. meter)

F. bottom. If the depth of liquid in the tank is more than twice the agitator diameter, two

A. Ratio of volume to surface as the particle

B. None of these

D. Volume as the particle

A. Elutriation

B. None of these

C. Tabling

A. Size of the product (at constant feed size)

B. Capacity of the crushing machine

C. Size of feed (at constant reduction ratio)

B. Hammer crushers operate by impact action

C. Standard screens have circular opening

D. With increase in mesh number of screens, their diameter in microns decreases

A. Wet grinding in low viscous suspension

B. Dry grinding of large particles (upto 1.25 cms)

D. Wet grinding in high viscous suspension

A. At least equal to

B. Slightly more than

C. Much more than

A. Cams or eccentric shafts

B. Electromagnets

C. Unbalanced flywheels

A. Decreased with the time of filtration

B. Important in the beginning of filtration

D. Independent of pressure drop

B. meter, in which the area beneath the curve represents the surface

C. Cumulative analysis for determining surface area is preferred over differential analysis,

D. ause of the assumption that all particles in a simple fraction equal in size is not needed

E. Rolling of pebbles/balls from top to bottom of the heap in tumbling mills is called cascading

F. throwing of the balls through the air to the toe of the heap is called cataracting

B. Properties of the cake & the filtrate

C. Pressure drop & area of filtering surface

D. Resistance of the cake & the septum

A. Swirling

B. Vortexing

D. Neither A. nor B.