Statement 1: Sieder-Tate and Dittus-boelter equations imply only to laminar flow conditions. Statement 2: Under laminar conditions, the same equation applies both to Newtonian and Non-Newtonian fluids.

Statement 1: For non-Newtonian fluids, another term called apparent viscosity is used as their viscosity changes with the change in the shear rate. Statement 2: For non-Newtonian fluids, between the transition region, the power number for non-Newtonian fluids is slightly higher than that for Newtonian fluids.

A

True, False

B

True, True

C

False, False

D

False, True

Statement 1: Scraping improves heat transfer co-efficient by 5 times in case of non-Newtonian fluids. Statement 2: In food industry, major physical changes to food items when they’re processed, take place like transformation from Newtonian to Non-Newtonian fluids. Hence, scraped surface heat exchangers are very beneficial.

A

True, False

B

True, True

C

False, False

D

False, True

Statement 1: In μ_a= τ/γ = Kγ(n-1) , n = consistency index and K is the flow behaviour index. Statement 2: n= 1 for Newtonian fluids, n<1 for dilatant fluids and n>1 for pseudo plastic fluids.

A

True, False

B

True, True

C

False, False

D

False, True

Which of the following statements is/are CORRECT regarding the flow of fluid? a) All fluid layers are parallel to each other in case of turbulent flow. b) The Reynold’s number is less than 2000 for turbulent flow and greater than 4000 for laminar flow. c) Two fluid layers don’t cross each other in case of laminar flow

A

Only a is correct.

B

Only b is correct

C

Only c is correct

D

All a, b and c are correct

Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is

A

$$\frac{{\text{Q}}}{2}$$

B

$$\frac{{\text{Q}}}{4}$$

C

$$\frac{{\text{Q}}}{8}$$

D

$$\frac{{\text{Q}}}{{16}}$$

Who summarized the procedure for scaling up both Newtonian and non-Newtonian fermentations?

A

Hubbard

B

Fox

C

Lilly

D

Sinclair

The figure shows the plot of y as a function of x
Differential Equations mcq question image

The function shown is the solution of the differential equation (assuming all initial conditions to be zero) is

A

$$\frac{{{{\text{d}}^2}{\text{y}}}}{{{\text{d}}{{\text{x}}^2}}} = 1$$

B

$$\frac{{{\text{dy}}}}{{{\text{dx}}}} = {\text{x}}$$

C

$$\frac{{{\text{dy}}}}{{{\text{dx}}}} = - {\text{x}}$$

D

$$\frac{{{\text{dy}}}}{{{\text{dx}}}} = \left| {\text{x}} \right|$$

A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is

A

20°C

B

40°C

C

60°C

D

66.7°C

Statement 1: Non-Newtonian fluids have a linear relationship between shear stress and shear strain. Statement 2: Tubes are larger than pipes in diameter and have thicker walls.

A

True, False

B

True, True

C

False, False

D

False, True

Select from the following non - Newtonian fluids in which the rate of shear deformation is a function of both shear stress and time - (1) Dilatant liquid (2) Bingham plastic liquid (3) Pseudoplastic liquid (4) Thixotropic liquid (5) Rheopectic liquid

A

1, 2 and 3

B

2 and 3

C

1, 4 and 5

D

4 and 5

Statement 1: Sieder-Tate and Dittus-boelter equations imply only to laminar flow conditions. Statement 2: Under laminar conditions, the same equation applies both to Newtonian and Non-Newtonian fluids.

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