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.Management Sciences
Category: Mechanical Operations
Pick out the wrong statement?
A. Close circuit grinding is more economical than open circuit grinding
B. Cod oil, beef tallow or aluminium stearates are used as grinding aids in cement ‘industries’
C. The equipment used for the removal of traces of solids from a liquid is called a classifier
D. Size enlargement is a mechanical operation exemplified by medicinal tablet making
Vacuum filter is most suitable for the_______________?
A. Removal of fines from liquid
B. Liquids having high vapour pressure
C. Liquids of very high viscosity
D. None of these
increasing the capacity of a screen _______________ the screen effectiveness?
A. Decreases
B. Increases
C. Does not effect
D. None of these
Gold ore concentration is mostly done using___________________?
A. Jigging
B. Tabling
C. Froth floatation
D. Elutriation
What is the selectivity index, if the grade of tailings & concentrate is the same ?
A. 0
B. ∞
C. 1
D. 0.5
Gelatinous solid (which plug the septum) can be filtered by a _____________ filter?
A. Sparkler
B. Plate and frame
C. Vacuum leaf
D. Pre-coat
Which of the following must be stored in silos and not in open yard ?
A. Coke breeze
B. High V.M. bituminous coal
C. Sand
D. None of these
Metallic wire mesh is used as a filtering medium for the separation of dust from dust laden gas in case of a/an________________?
A. Air filter
B. Bag filter
C. Venturi scrubber
D. Hydrocyclones
Colloid mills achieve size reduction mainly by___________________?
A. Impact
B. Attrition
C. Cutting
D. Compression
Particle size range in which dust catcher (gravity settling chamber) works most effectively and efficiently is ______________ microns?
A. < 5
B. 10 to 25
C. < 74
D. > 1000
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