Q.1
Which one of the following rightly defines mixing?
  • a) Mixing converts a homogenous system to a heterogeneous system without adding any materials
  • b) Mixing converts a heterogeneous system to a homogeneous system without adding any materials
  • c) Mixing converts a heterogeneous system to a homogeneous system with or without adding any materials
  • d) Mixing converts a heterogeneous system to a homogeneous system with or without adding any materials
Q.2
Which of the following is the best difference between mixing and blending?
  • a) Mixing can only be done for a solid-solid system, while blending is done for solid-liquid mixture
  • b) Mixing is done for liquid-liquid, gas-liquid and solid-liquid systems, while blending is done for solid-solid mixture
  • c) Bending is done for liquid-liquid and gas-liquid systems, while mixing is done for solid-solid mixture
  • d) Mixing is done for liquid-liquid and gas-liquid systems, while blending is done for solid-solid mixture
Q.3
Which of the following describes solid-liquid mixing the best?
  • a) The end result of solid-liquid mixing is always dissolution
  • b) Solid-liquid mixing suspends coarse solids in the liquids
  • c) Solid-liquid mixing cannot break lumps of aggregated solids
  • d) Solid-liquid mixing suspends coarse solids in the liquids and break lumps of aggregated solids
Q.4
Which of the following is correct about the factors affecting mixing of solids?
  • a) Mixing is independent of the nature of particle surface
  • b) Difference in particle size can lead to segregation
  • c) Demixing accelerates when smaller particles have lesser density
  • d) Particle shape does not affect mixing
Q.5
Which of the following is false about speed of rotation in tumblers?
  • a) In slow rotation, enough shear is not applied
  • b) Speed of rotation depends only on size and shape of the tumbler
  • c) Rapid rotation leads to segregation
  • d) Tumblers are operated at a critical and optimum speed
Q.6
Which of the following is correct about a twin shell blender?
  • a) The material is loaded approximately 80%-90% by volume
  • b) Twin shell blenders are U shaped
  • c) Materials inside undergo tumbling motion when rotated
  • d) Material is loaded via apex port and emptied through shell hatches
Q.7
Which of the following is not a disadvantage of tumbler with blades?
  • a) Large shear force cannot be applied
  • b) Potential packing
  • c) Scaling up the process
  • d) Cleaning the tumbler
Q.8
What is the principle of mixing?
  • a) Shear force
  • b) Perpendicular force
  • c) Gravitational force
  • d) Centrifugal force
Q.9
Which of the following is a right match?
  • a) Static mixer – Mortar Pestle
  • b) Batch type – Fluidized mixer
  • c) Tumbling type – V cone blender
  • d) Continuous type – Ribbon blender
Q.10
Which of the following is the correct match?
  • a) I-i, II-ii, III-iii, IV-iv
  • b) I-iii, II-ii, III-ii, IV-iv
  • c) I-ii, II-iii, III-vi, IV-i
  • d) I-ii, II-iv, III-iii, IV-i
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