Q. The cummulative mass fraction of particles smaller than size dⱼ for a collection of Nᵢ particles of diameter dᵢ and mass mi (i = 1, 2, 3, ...... ∞) is given by

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Q. Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle).

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Q. What is the reduction ratio in a fine crushing operation having following feed and product sizes?

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Q. The value of 'angle of nip' is generally about

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Q. Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.

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Q. Sulphuric acid mist is arrested by using a __________ scrubber.

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Q. The main size reduction operation in ultrafine grinders is

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Q. In case of a hammer crusher,

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Q. The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 μrn is

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Q. Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm) ?

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Q. Pick out the correct statement:

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Q. Range of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is

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Q. Highly viscous liquids & pastes are agitated by

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Q. Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a __________ conveyor.

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Q. Equivalent diameter of a particle is the diameter of the sphere having the same

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Q. If dₚ is the equivalent diameter of a non-spherical particle, Vₚ its volume and sₚ its surface area, then its sphericity is Φₛ is defined by

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Q. Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill )

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Q. Pick out the wrong statement.

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Q. The distribution given by microscopic analysis of powder is

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Q. Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vₚ = volume of one particle, ρ= density of particles)

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