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Mechanical Operations
Mechanical Operations Objective
Quiz 1
Solution
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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