Vacuum is applied in _______________ zone, in case of a general type continuous rotary drum vacuum filter?
A. Filtering
B. Washing
C. Drying
D. All A., B. & C.
Mechanical Operations
The capacity of a gyratory crusher is ______________ that of a jaw crusher with the same gape, handling the same feed & for the same product size range.?
The capacity of a gyratory crusher is ______________ that of a jaw crusher with the same gape, handling the same feed & for the same product size range.?
A. Same as
B. 2.5 times
C. 5 times
D. 10 times
Optimum ratio of operating speed to critical speed of a trommel is_____________________?
Optimum ratio of operating speed to critical speed of a trommel is_____________________?
A. 0.33-0.45
B. 1.33-1.45
C. 0.5-2
D. 1.5-2.5
Width and speed of a conveyor belt depends upon the ______________ of the material?
Width and speed of a conveyor belt depends upon the ______________ of the material?
A. Lump size
B. Bulk density
C. Both A. & B.
D. Neither A. nor B.
Soft & non-abrasive materials can be made into fines by________________________?
Soft & non-abrasive materials can be made into fines by________________________?
A. Attrition
B. Compression
C. Cutting
D. None of these
Which is a secondary crusher for a hard & tough stone ?
Which is a secondary crusher for a hard & tough stone ?
A. Jaw crusher
B. Cone crusher
C. Impact crusher
D. Toothed roll crusher
_______________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals?
_______________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals?
A. Separation efficiency
B. Selectivity index
C. Concentration ratio
D. None of these
Size reduction of moulding powders, waxes, resins & gums are done in a _______________ mill?
Size reduction of moulding powders, waxes, resins & gums are done in a _______________ mill?
A. Cage
B. Hammer
C. Both A. & B.
D. Neither A. nor B.
Ball mill is used for__________________?
Ball mill is used for__________________?
A. Crushing
B. Coarse grinding
C. Fine grinding
D. Attrition
During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration___________________?
During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration___________________?
A. At time zero
B. At the end of filtration
C. When half the filtrate has been obtained
D. At the end of filtration, but decreases with time subsequently