Mechanical Operations Interview Questions - Set 25

Practice Test: Question Set - 25

1. Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre V = speed of the conveyor, metre/second ρ = bulk density of material, kg/m3)
    (A) 3.6 W.D.V.ρ
    (B) 3.6 W.D.V
    (C) 3.6 W.V.ρ
    (D) 3.6 D.V.ρ
2. Balls for ball mills are never made of
    (A) Forged/cast steel
    (B) Lead
    (C) Cast iron
    (D) Alloy steel
3. For removal of very small amounts of precipitate from large volume of water, the most suitable filter is the __________ filter.
    (A) Plate & frame
    (B) Shell & leaf
    (C) Sand
    (D) Rotary vacuum
4. Helical screw agitator is used for
    (A) Mixing highly viscous pastes
    (B) Blending immiscible liquids
    (C) Mixing liquids at very high temperature (> 250 °C)
    (D) None of these
5. Which of the following conveyors cannot be recommended for transportation of abrasive materials?
    (A) Belt conveyor
    (B) Apron conveyor
    (C) Flight conveyor
    (D) Chain conveyor
6. Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill.)
    (A) D
    (B) 1/D
    (C) D2.5
    (D) 1/D2.5
7. Mesh indicates the number of holes per
    (A) Square inch
    (B) Linear inch
    (C) Square foot
    (D) Linear foot
8. Which of the following is not a non-metalliferous mineral?
    (A) Calcite
    (B) Fluorspar
    (C) Quartz
    (D) Cassiterite
9. Which of the following comes in the category of primary crusher for hard and tough stone?
    (A) Jaw crusher
    (B) Cone crusher
    (C) Gyratory crusher
    (D) None of these
10. Fluid medium used in the classification technique of mineral beneficiation is
    (A) Air
    (B) Water
    (C) Either (a) or (b)
    (D) Neither (a) nor (b)
11. Two particles are called to be equal settling, if they are having the same.
    (A) Size
    (B) Specific gravity
    (C) Terminal velocities in the same fluid & in the same field of force
    (D) None of these
12. A widely used size reduction equipment for __________ is Bradford breaker.
    (A) Talc
    (B) Coal
    (C) Iron core
    (D) Wheat
13. Apron conveyors are used for
    (A) Heavy loads & short runs
    (B) Small loads & long runs
    (C) Heavy loads & long runs
    (D) None of these
14. The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be __________ cms.
    (A) 20
    (B) 12
    (C) 8
    (D) 2
15. For a non-spherical particle, the sphericity
    (A) Is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle
    (B) Has the dimension of length
    (C) Is always less than 1
    (D) Is the ratio of volume of a sphere having the same surface area as the particle to the actual volume of the particle
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