Mechanical Operations GATE Exam Paper Online Test - Set 16 - ObjectiveBooks

Mechanical Operations GATE Exam Paper Online Test - Set 16

Practice Test: Question Set - 16

1. To produce talcum powder, use
    (A) Ball mill
    (B) Hammer mill
    (C) Jet mill
    (D) Pin mill

2. Raw materials are charged in the iron blast furnace using
    (A) Bucket elevator
    (B) Skip hoist
    (C) Screw conveyor
    (D) None of these

3. Solid particles of different densities are separated by
    (A) Filters
    (B) Thickness
    (C) Cyclones
    (D) Sorting classifier

4. As the product becomes finer, the energy required for grinding
    (A) Decreases
    (B) Increases
    (C) Is same as for coarser grinding
    (D) Is 1.5 times that for coarser grinding

5. Moore filter is a __________ filter.
    (A) Leaf
    (B) Press
    (C) Rotary
    (D) Sand

6. Choke crushing (in case of a Jaw crusher) compared to free crushing
    (A) Results in increased capacity
    (B) Consumes less power
    (C) Consumes more power
    (D) Both (a) and (c)

7. 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

8. Mechanical conveyors which push the material along an endless trough or tube are called scrappers. Which of the following conveying equipments comes under the category of ‘scrappers’?
    (A) Bucket conveyor
    (B) Flight conveyor
    (C) Screw conveyor
    (D) Both (b) and (c)

9. During agitation of liquids, power consumption during laminar flow is not proportional to the
    (A) Density of the liquid
    (B) Viscosity of the liquid
    (C) Cube of impeller diameters
    (D) Square of rotational speed

10. Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.
    (A) Jaw crusher, Ball mill, Fluid energy mill
    (B) Ball mill, Jaw crusher, Fluid energy mill
    (C) Fluid energy mill, Jaw crusher, Ball mill
    (D) Fluid energy mill, Ball mill, Jaw crusher

11. The main differentiation factor between tube mill and ball mill is the
    (A) Length to diameter ratio
    (B) Size of the grinding media
    (C) Final product size
    (D) Operating speed

12. Additives used for promoting the flocculation of particles is a/an
    (A) Electrolyte
    (B) Surface active agent
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

13. For sizing of fine materials, the most suitable equipment is a
    (A) Trommel
    (B) Grizzly
    (C) Shaking screen
    (D) Vibrating screen

14. For separation of sugar solution from settled out mud, we use a __________ filter.
    (A) Sparkler
    (B) Plate and frame
    (C) Centrifugal
    (D) Rotary drum vacuum

15. The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle).
    (A) 6/D.ρ
    (B) 2/D.ρ
    (C) 4/D.ρ
    (D) 12/D.ρ

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