Download GTU BE/B.Tech 2019 Winter 5th Sem New 2152604 Rheology Of Rubber Question Paper

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Subject Code: 2152604

GUJARAT TECHNOLOGICAL UNIVERSITY

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BE - SEMESTER- V (New) EXAMINATION - WINTER 2019
Subject Name: Rheology of Rubber
Time: 10:30 AM TO 01:00 PM

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1 (a) “Reiner Philipp off model is used as three parameter model” justify the statement. [03]
(b) Draw the flow chart of Non Newtonian fluid and explain any one in detail. [04]
(c) Discuss the Ostwald De Waele model and derive its equation. [07]

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Q.2 (a) Define the Terms: (i) Reynolds number (ii) Laminar flow (iii) Turbulent flow. [03]
(b) “Reynolds number is important parameter for Fluid flow” Justify the statement. [04]
(c) Derive the equation for velocity profile for Newtonian fluid. [07]

OR

(c) Derive the equation for velocity profile in Non Newtonian fluid. [07]

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Q.3 (a) What do you mean by turbulence damping? [03]
(b) State the assumptions implied in the development of Hagen poiseuille law. [04]
(c) Derive the Velocity profile, Maximum velocity-profile and Average velocity profile equations for flow through circular tube: [07]

OR

Q.3 (a) Write the boundary conditions for shell momentum balance. [03]

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(b) Derive the momentum flux distribution equation for falling film. [04]
(c) Draw the schematic diagram of Flow through annulus tube and derive the Average Velocity profile equations. [07]

Q.4 (a) List out the different types of Viscometer used in rubber industries. [03]
(b) Draw the figure of Sandwich rheometer and explain it in brief. [04]
(c) Explain the different applications of Mooney viscometer in detail. [07]

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OR

Q.4 (a) Write the shear stress equation of Mooney Viscometer. [03]
(b) Which parameter we have to keep in mind in falling sphere viscometer? [04]
(c) Draw the diagram of Biconical rheometer and explain it in detail. [07]

Q.5 (a) Write the procedure for sample preparation of moony viscosity test. [03]

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(b) How molecular weight and molecular structure will affect the Rheology of rubber? [04]
(c) Explain the effect of temperature on the Rheology of rubbers. [07]

OR

Q.5 (a) Write the equation for “Zero shear viscosity.” [03]
(b) What do you mean by entanglement of molecules? Explain it with suitable example. [04]

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(c) Short note on “ Molecular Motions” [07]

Date: 04/12/2019
Total Marks: 70

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