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.Management Sciences
Category: Mechanical Operations
Out of the following size reduction equipments, the maximum feed size can be accepted by the__________________?
A. Tube mill
B. Ball mill
C. Jaw crusher
D. Jet pulveriser
Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation ?
A. Check plates
B. Jaw plates
C. Toggles
D. Crush shaft
In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called _____________ is produced?
A. Concentrate
B. Tailing
C. Middling
D. None of these
Solid particles separation based on the difference in their flow velocities through fluids is termed as the__________________?
A. Clarification
B. Classification
C. Elutriation
D. Sedimentation
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.
In classification, particles are said to be equal settling, if they have the same terminal velocities in the_______________?
A. Different fluids
B. Same fluid
C. Same field of force
D. Both B. and C.
Stamp mills are generally used for crushing__________________?
A. Iron ores
B. Gold ores
C. Talc
D. Diamond
Pick out the wrong statement ?
A. For the compressible cake, voidage & the specific resistance of the cake can be assumed to be
constant
B. Cake resistance is independent of the pressure drop
C. Crushing of explosive materials are done by employing dry-grinding
D. Gyratory crusher is a coarse crusher
_____________ Centrifuge is normally used in sugar mills?
A. Tubular bowl
B. Disc-bowl
C. Suspended batch basket
D. Perforated horizontal basket continuous
Hot, lumpy & abrasive materials are best transported by using a/an ___________ conveyor ?
A. Apron
B. Belt
C. Screw
D. Flight
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