Mechanical Operations

A. Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of
the product passes through a 100 micron screen
B. Energy needed to crush one tonne of feed to 200 microns
C. Energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product
passes a 200 mesh screen
D. Energy needed to crush one ton of feed to 100 microns

A. Elasticity
B. Hardness
C. Toughness
D. Size

A. Plug
B. Turbulent
C. Laminar
D. None of these

A. Banbury
B. Pug mill
C. Tumbling
D. Pan

A. Smooth roll crusher
B. Toothed roll crusher
C. Gyratory crusher
D. Tube mill

A. 5-10
B. 10-20
C. 20-40
D. As high as 100

A. Cake becomes very dense
B. Liquor stops flowing out to the discharge
C. Filtration pressure rises suddenly
D. Both B. & C.

A. Conditioner
B. Frother
C. Collector
D. Activator

A. Less than
B. Much more than
C. At least equal to
D. Slightly more than

A. Pressure drop & area of filtering surface
B. Resistance of the cake & the septum
C. Properties of the cake & the filtrate
D. None of these