Screen capacity is expressed in terms of____________________?
Screen capacity is expressed in terms of____________________?
A. tons/hr
B. tons/ft2
C. Both A. & B.
D. tons/hr-ft2
Mechanical Operations
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Crushing efficiency is the ratio of the ______________________ ?
Crushing efficiency is the ratio of the ______________________ ?A. Surface energy created by crushing to the energy absorbed by the solid
B. Energy absorbed by the solid to that fed to the machine
C. Energy fed to the machine to the surface energy created by crushing
D. Energy absorbed by the solid to the surface energy created by crushing -
Which one is a filter aid ?
Which one is a filter aid ?A. Canvas fabric
B. Diatomaceous earth
C. Calcined lime
D. None of these -
A propeller agitator_______________?
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. -
Shell and leaf filter as compared to plate and frame filter _____________________?
Shell and leaf filter as compared to plate and frame filter _____________________?A. Entails less labor cost
B. Facilitates filtration under higher pressure
C. Provides more effective washing
D. All A., B. & C. -
Length/diameter ratio of a ball mill is __________________ ?
Length/diameter ratio of a ball mill is __________________ ?A. 1.5
B. 1
C. < 1
D. > 1 -
Mixing mechanism employed in a pan mixer is by ________________?
Mixing mechanism employed in a pan mixer is by ________________?A. Mulling
B. Kneading
C. Dispersion
D. None of these -
Capacity (in tons/hr) of jaw/gyratory crusher is equal to (where, L = length of the receiving opening, cm S = greater width of the discharge opening, cm) ?
Capacity (in tons/hr) of jaw/gyratory crusher is equal to (where, L = length of the receiving opening, cm S = greater width of the discharge opening, cm) ?A. 0.01 L.S
B. 0.087 L.S
C. L.S
D. L.S/0.087 -
Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are________________?
Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are________________?A. Carbonates
B. Sulphates
C. Silicates & phosphates
D. Bi-carbonates -
Toothed roll crushers achieve size reduction by___________________?
Toothed roll crushers achieve size reduction by___________________?A. Tearing (shear) and compression
B. Impact and attrition
C. Both A. & B.
D. Neither A. nor B.