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Mechanical Operations

Mechanical Operations
Filtration rate through a filter cake is proportional to (where, S = filtering surface R = specific cake resistance μ = viscosity of the filtrate)

S
1/μ
All of these
1/R

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Mechanical Operations
If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the

Centrifugal force is doubled
Linear speed of the basket is halved
Linear speed of the basket is doubled
Capacity of centrifuge is increased

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Mechanical Operations
Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripherial velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m³ here, V =πN.D where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m)

3.6 V.W.Dr/ρ
3.6 W.Dr.ρ
3.6 V.W.Dr.ρ
3.6 V.W. ρ

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Mechanical Operations
The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond's law, Rittinger's law and Kick's law) depend upon the

Type of crushing machine
Feed material
Both A & B
Neither A nor B

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Mechanical Operations
Which is the most suitable conveyor for transportation of sticky material?

Belt conveyor
Pneumatic conveyor
Apron conveyor
Screw conveyor

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Mechanical Operations
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.

Ultrafine
Fine
Secondary
Primary

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