Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill.) ?
A. D
B. 1/D
C. D2.5
D. 1/D2.5
Mechanical Operations
Which of the following is not a non-metalliferous mineral ?
Which of the following is not a non-metalliferous mineral ?
A. Calcite
B. Fluorspar
C. Quartz
D. Cassiterite
Fluid medium used in the classification technique of mineral beneficiation is_________________?
Fluid medium used in the classification technique of mineral beneficiation is_________________?
A. Air
B. Water
C. Either A. or B.
D. Neither A. nor B.
A widely used size reduction equipment for ______________ is Bradford breaker?
A widely used size reduction equipment for ______________ is Bradford breaker?
A. Talc
B. Coal
C. Iron core
D. Wheat
The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be _______________ cms?
The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be _______________ cms?
A. 20
B. 12
C. 8
D. 2
Mixing of light fine powder such as insecticides is done by____________________?
Mixing of light fine powder such as insecticides is done by____________________?
A. Banbury mixer
B. Pug mill
C. Impact wheels
D. Kneader
Energy consumption in a crusher decreases with increase in the________________________?
Energy consumption in a crusher decreases with increase in the________________________?
A. Size of the product (at constant feed size)
B. Capacity of the crushing machine
C. Size of feed (at constant reduction ratio)
D. All A., B. & C.
Filter medium resistance is that offered by the__________________?
Filter medium resistance is that offered by the__________________?
A. Filter cloth
B. Embedded particles in the septum
C. Filter cloth and the embedded particle collectively
D. None of these
Crushing of mineral particles is accomplished in a ‘cage mill’, when one or more alloy steel bars are revolved in opposite directions. It is a type of ______________ mill?
Crushing of mineral particles is accomplished in a ‘cage mill’, when one or more alloy steel bars are revolved in opposite directions. It is a type of ______________ mill?
A. Impact
B. Roll
C. Vibratory
D. None of these
A compressible cake has the_________________?
A compressible cake has the_________________?
A. Maximum porosity at the upstream side
B. Maximum porosity at the filter medium
C. Same porosity throughout the cake thickness
D. None of these