GATE MT Strain tensor and stress tensor, Representation by Mohr’s circle, elasticity, stiffness and compliance tensor, Yield criteria, Plastic deformation by slip and twinning. PYQs & Answers — Page 3

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Strain tensor and stress tensor, Representation by Mohr’s circle, elasticity, stiffness and compliance tensor, Yield criteria, Plastic deformation by slip and twinning.

Questions 21–27 of 27. Imported answers require independent review unless marked reviewed.

Topic practice 27 questionsPage 3 of 3

Determine the correctness (or otherwise) of the following Assertion [A] and the Reason [R]

Assertion [A]: Refractory BCC metals like W and Mo are less ductile than FCC metals like Ni and Pt at room temperature Reason [R]: BCC metals have fewer independent slip systems than FCC metals

Your answerChoose one option.

Both [A] and [R] are true and [R] is the correct reason for [A]

Both [A] and [R] are true, but [R] is not the correct reason for [A]

Both [A] and [R] are false

[A] is true but [R] is false

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Match the four tensile stress-strain curves (P,Q, R, S) with the materials listed in the box:

Diagram for Metallurgical Engineering question 31

Your answerChoose one option.

P-1, Q-2, R-3, S-4

P-3, Q-1, R-4, S-2

P-3, Q-2, R-4, S-1

P-2, Q-3, R-4, S-1

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Consider the following stress state imposed on a material:

. If the material responds elastically with a volumetric strain

, what is its bulk modulus?

Your answerChoose one option.

150 GPa

350 GPa

200 GPa

400 GPa

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A single crystal of aluminium is subjected to 10 MPa tensile stress along the [321] crystallographic direction. The resolved shear stress on the

slip system is ______ (in MPa to two decimal places)

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Primary mechanisms of accommodating plastic strain at low temperatures in crystalline metals are:

Your answerChoose one option.

twinning and dislocation-slip

dislocation-climb and dislocation-slip

dislocation-slip and diffusion

viscous-flow and dislocation-slip

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A rod is elastically deformed by a uniaxial stress resulting in a strain of 0.02. If the Poisson’s ratio is 0.3, the volumetric strain is __________ (answer up to three decimal places)

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A single crystal of an FCC metal is subjected to a sufficiently large tensile stress along the [1̄10] direction to activate some of the slip systems. Which one of the following slip systems will be activated:

Your answerChoose one option.

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GATE MT Strain tensor and stress tensor, Representation by Mohr’s circle, elasticity, stiffness and compliance tensor, Yield criteria, Plastic deformation by slip and twinning. PYQs

Question 28

Question 31

Question 40

Question 46

Question 14

Question 20

Question 51