Search
.Management Sciences
Category: Mechanical Operations
Size reduction of the ______________ can be suitably done by ball mills, crushing rolls and rod mills?
0
A. Metalliferous ores
B. Non-metallic ores
C. Basic slags
D. Asbestos & mica
Separation of materials of the same density based on their sizes by using then-different rates of flow is called__________________?
A. Sorting
B. Sizing
C. Flocculation
D. Elutriation
Carbon black is pulverised in a_______________?
A. Hammer crusher
B. Ball mill
C. Roll crusher
D. Gyratory crusher
Angle of nip of the crushing rolls does not depend upon the_______________?
A. Diameter of the rolls
B. Speed of the rolls
C. Product size
D. Feed size
Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity ?
A. Sphere
B. Cube
C. Cylinder (L/D = 1)
D. Raschig rings
Raw materials are charged in the iron blast furnace using____________________?
A. Bucket elevator
B. Skip hoist
C. Screw conveyor
D. None of these
In case of grinding in a ball mill__________________?
A. Wet grinding achieves a finer product size than dry grinding
B. Its capacity decreases with increasing fineness of the products
C. Grinding cost and power requirement increases with increasing fineness of the products
D. All A., B. and C
Recent Comments