TYPES OF FLUIDS | PREVIOUS YEAR GATE & ESE MULTIPLE CHOICE QUESTIONS

Fluids are mainly of two types:-

1) Newtonian Fluids: 

Fluids which follows Newton's law of viscosity

2) Non-Newtonian Fluids: 

These do not follow Newton's law of viscosity.

The relation between shear stress and velocity gradient is:


where A and B are constants depending upon type of fluid and condition of flow.

The different types of fluids are as follows:

1) Dilatant Fluids: 

Shear thickening fluid.

n > 1 & B = 0, 

i.e. Apparent viscosity increases with increase in shear stress.

e.g.: Solution with suspended sand, conc. sugar solution, Butter, Quick sand.

2) Newtonian Fluids: 

n = 1 & B = 0 

i.e. Viscosity is invariant of shear stress.

e.g.: Water, air, gasoline and oil.

3) Pseudoplastic Fluids: 

Shear thinning fluid

n < 1 & B = 0 

i.e. Apparent viscosity decreases with increase in shear stress

e.g.: Paper pulp, Rubber solution, Lipsticks, Paints, Blood, Milk, Polymetric solutions etc.


4) Rheopectic Fluids: 

n > 1 & B = 0 

i.e. Apparent viscosity increases with increase in shear stress.

e.g.: Gypsum solution in water & Bentonite solution.

5) Bingham Plastic/Ideal Plactic Fluids: 

n = 1 & B is not equal to  0.

e.g.: Sewage sludge, Drilling mud, tooth paste and gel.

6) For Thixotropic Fluids: 

n < 1 & B is not equal to 0.

i.e., apparent viscosity decreases with

increase in shear stress.

e.g.: Printers ink and Enamels.


MULTIPLE CHOICE QUESTIONS:

Que: Match List I with List II


List I

List II

  1. Dilatant Fluid

  2. Bingham Plastic

  3. Pseudoplastic fluid

  4. Newtonian Fluid


a) A-1, B-2, C-4, D-3

b) A-1, B-2, C-3, D-4

c) A-2, B-1, C-3, D-4

d) A-2, B-1, C-4, D-3


ANSWER: b)


Que: Match Group I with Group II



Group I

Group II

A. Newtonian Fluid

B. Pseudoplastic fluid

C. Plastic fluid

D. Dilatant fluid


a) 2-A, 4-B, 5-C, 3-D

b) 2-A, 1-B, 3-C, 4-D

c) 2-A, 5-B, 4-C, 1-D

d) 2-A, 4-B, 1-C, 5-D


ANSWER: a)


PRACTICE MCQs BASED ON TYPES OF FLUIDS



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