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91.

A bar produces a lateral strain of magnitude -60 x 10^-5, when subjected to tensile stress of magnitude 300 MPa along the axial direction. Find the elastic modulus of the material, if the Poisson's ratio is 0.3.
(a) 100 GPa
(b) 150 GPa
(c) 200 GPa
(d) 400 GPa

asked in Mechanical Paper-2, 2009

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92.

What is the relationship between elastic constants E, G and K?
a. E = KG/(9K+G)
b. E = 9KG/(K+G)
c. E = 9KG(K+3G)
d. E = 9KG/(3K+G)

asked in Mechanical Paper-2, 2009

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93.

The principal strains at a point in a body, under biaxial state of stress, are 1000 x 10^-6 and - 600 x 10^-6. What is the maximum shear strain at that point?
(a) 200 x 10^-6
(b) 800 x 10^-6
(c) 1000 x 10^-6
(d) 1600 x 10^-6

asked in Mechanical Paper-2, 2009

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94.

Consider the following statements:
1. Two-dimensional stresses applied to a thin plate in its own plane represent the plane stress condition.
2. Under plane stress condition,the strain in the direction perpendicular to the plane is zero.
3. Normal and shear stresses may occur simultaneously on a plane.
Which of the above statements is/are correct?
(a) 1 only
(b) 1 and 2
(c) 2 and 3
(d) 1 and 3

asked in Mechanical Paper-2, 2009

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95.

Assertion (A): Mohrs construction is possible for stresses, strains and area moment of inertia.
Reason (R): Mohr's circle represents the transformation of second-order tensor.
Which of the following statements is correct?
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true

asked in Mechanical Paper-2, 2009

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96.

On what does the basic static capacity of a ball bearing depends?
(a) Directly proportional to number of balls in a row and diameter of ball
(b) Directly proportional to square of ball diameter and inverse of number of rows of balls
(c) Directly proportional to number of balls in a row and square of diameter of ball
(d) Inversely proportional to square of diameter of ball and directly proportional to number of balls in a row

asked in Mechanical Paper-2, 2009

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