Engineering Questions with Answers - Multiple Choice Questions
Mechanical Operations MCQ’s – Flow of Liquid Through Cloth
1 - Question
_____are formed when two or more than two gases or miscible liquids are mixed.
a) Negative mixture
b) Positive mixtures
c) Neutral mixtures
d) Solid mixtures
View Answer
Answer: b
Explanation: These types of mixtures are formed when two or more than two gases or miscible liquids are mixed together by means of diffusion process.
2 - Question
____ are formed when insoluble solids are mixed with a vehicle to form a suspension.
a) Negative mixture
b) Positive mixtures
c) Neutral mixtures
d) Solid mixtures
View Answer
Answer: a
Explanation: These types of mixtures are formed when insoluble solids are mixed with a vehicle to form a suspension or when two immiscible liquids are mixed to form an emulsion.
3 - Question
_____ are static in their behavior.
a) Negative mixture
b) Positive mixtures
c) Neutral mixtures
d) Solid mixtures
View Answer
Answer: c
Explanation: The components of such products do not have any tendency to mix spontaneously but once mixed, they do not separate out easily.
4 - Question
When during convective mixing, transfer of groups of particles in bulk take place is called as ____
a) Convective mixing
b) Diffusive mixing
c) Shear mixing
d) Particulate mixing
View Answer
Answer: a
Explanation: During convective mixing transfer of groups of particles in bulk take place from one part of powder bed to another. Convective mixing is referred to as macromixing.
5 - Question
When, shear forces are created within the mass of the material this is called ____
a) Convective mixing
b) Diffusive mixing
c) Shear mixing
d) Particulate mixing
View Answer
Answer: c
Explanation: During shear mixing, shear forces are created within the mass of the material by using agitator arm or a blast of air.
6 - Question
When, the materials are tilted so that the gravitational forces cause the upper layers to slip such mixing is called as ______
a) Convective mixing
b) Diffusive mixing
c) Shear mixing
d) Particulate mixing
View Answer
Answer: b
Explanation: When the materials are tilted so that the gravitational forces cause the upper layers to slip, Diffusion is also sometimes referred to as micro mixing.
7 - Question
The movement of a relatively large portion of the material being mixed from one location in the system to another constitutes _____
a) Bulk transport
b) Laminar mixing
c) Turbulent mixing
d) Transition mixing
View Answer
Answer: a
Explanation: A simple circulation of material in a mixer may not result in efficient mixing, for transport to be effective it must result in a rearrangement of the portions to be mixed.
8 - Question
____ is a direct result of turbulent fluid flow.
a) Bulk transport
b) Laminar mixing
c) Turbulent mixing
d) Transition mixing
View Answer
Answer: c
Explanation: The phenomenon of turbulent mixing is a direct result of turbulent fluid flow, which is characterized by a random fluctuation of the fluid velocity at any given point with in the system.
9 - Question
______ is frequently encountered when highly viscous liquids are being processed.
a) Bulk transport
b) Laminar mixing
c) Turbulent mixing
d) Transition mixing
View Answer
Answer: b
Explanation: It can also occur if stirring is relatively gentle and may exist adjacent to stationary surfaces in vessels in which the flow is predominantly turbulent.
10 - Question
The primary mechanism responsible for mixing at the molecular level is called _____
a) Bulk transport
b) Laminar mixing
c) Molecular diffusion
d) Lambda Mixing
View Answer
Answer: c
Explanation: The primary mechanism responsible for mixing at the molecular level is diffusion resulting from the thermal motion of the molecules.