Mechanical Operations Engineering Questions - Set 28

Practice Test: Question Set - 28

1. Grinding characteristic of a material is given by its
    (A) HGI
    (B) Angle of repose
    (C) Shatter index
    (D) Abrasion index
2. The material is crushed in a gyratory crusher by the action of
    (A) Impact
    (B) Compression
    (C) Attrition
    (D) Cutting
3. Ball mills and tube mills with flint or porcelain balls are used for size reduction of
    (A) Asbestos
    (B) Rubber
    (C) Non-metallic ores
    (D) Limestone
4. Production rate __________ with increased fineness, with a given energy input to the size reduction machine.
    (A) Decreases
    (B) Increases
    (C) Remains unchanged
    (D) May increase or decrease; depends on the machine
5. With increase in drum speed, in a rotary drum filter, the filtration rate
    (A) Increases
    (B) Increases linearly
    (C) Decreases
    (D) Is not affected
6. Cartridge filters are termed as 'edge' filters, because of the fact that the
    (A) Disks have very sharp edge
    (B) Solids are not deposited at the edge of the disk
    (C) Bulk of the solids are removed at the periphery of the disks
    (D) None of these
7. Gravity settling process is not involved in the working of a
    (A) Hydrocyclone
    (B) Classifier
    (C) Dorr-thickener
    (D) Sedimentation tank
8. Moisture can be removed from lubricating oil using
    (A) Tubular centrifuge
    (B) Clarifier
    (C) Sparkler filter
    (D) Vacuum leaf filter
9. Mixing of plastic solids is generally facilitated by
    (A) Dispersion
    (B) Mastication
    (C) Kneading
    (D) None of these
10. Hot, lumpy & abrasive materials are best transported by using a/an __________ conveyor.
    (A) Apron
    (B) Belt
    (C) Screw
    (D) Flight
11. The main size reduction operation in ultrafine grinders is
    (A) Cutting
    (B) Attrition
    (C) Compression
    (D) Impact
12. What is the selectivity index, if the grade of tailings & concentrate is the same?
    (A) 0
    (B) ∞
    (C) 1
    (D) 0.5
13. Which of the following is not used as a filter medium in case of corrosive liquids?
    (A) Nylon
    (B) Glass cloth
    (C) Metal cloth of monel or stainless steel
    (D) Cotton fabric
14. Fick's law relates to
    (A) Energy consumption
    (B) Final particle size
    (C) Feed size
    (D) None of these
15. Which of the following is a pressure filter?
    (A) Leaf filter (Moore filter)
    (B) Plate and flame filter
    (C) Rotary drum filter
    (D) Sand filter
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