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.Management Sciences
Category: Mechanical Operations
General mechanism of size reduction in intermediate and fine grinder is by __________________?
A. Cutting action
B. Compression
C. Compression and tearing
D. Impact and attrition
Apron conveyors are used for ___________________ ?
A. Heavy loads & short runs
B. Small loads & long runs
C. Heavy loads & long runs
D. None of these
Tube mill compared to ball mill_______________________?
A. Produces finer products
B. Is long in comparison with its diameter
C. Uses smaller balls
D. All A., B. & C.
The most suitable equipment used to devulcanise rubber scrap and to make water dispersion & rubber solution is a __________________?
A. Boundary mixer
B. Propeller agitator
C. Sharpies centrifuge
D. None of these
Pick out the correct statement?
A. The capacity and the effectiveness of a screen are the same
B. The capacity and the effectiveness of screen are opposing factors
C. The screening surface of a ‘reel’ (a revolving screen used in flour mills) is made of silk bolting
cloth supported by wire mesh
D. Both B. and C.
Filtration capacity of a rotary drum vacuum filter depends upon the_______________?
A. Cake thickness
B. Characteristics of the feed slurry
C. Both A. & B.
D. Neither A. nor B.
Weber number is significant and is concerned with the_________________?
A. Solid-liquid mixing
B. Liquid-liquid mixing
C. Dispersion of liquid in liquid
D. Suspension of solid in liquid
For a turbine agitated and baffled tank, operating at low Reynold’s number (based on impeller diameter), the power number (Np) varies with NRe as_________________?
A. Np ∝ NRe
B. Np ∝ √NRe
C. Np → constant
D. Np ∝ 1/NRe
_____________ are mixed using ribbon blenders ?
A. Lumpy solids and low viscosity liquids
B. Dry powders
C. High viscosity liquids
D. Thick pastes
Bucket elevators are not suitable for the vertical lifting of __________ materials?
A. Fine (e.g. – 200 mesh size coal)
B. Sticky (e.g. clay paste)
C. Small lumpy (e.g. grains and sand)
D. Free flowing
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