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79.

Which one of the following is correct for 'Climb'?
(a) Dislocation moves parallel to the slip plane
(b) Dislocation moves perpendicular to the slip plane
(c) Sliding of one plane of atoms over the other plane
(d) Dislocation moves from a slip plane to another slip plane

asked in Mechanical Paper-2, 2009

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80.

Which one of the following crystal systems is valid for gold?
(a) Orthogonal
(b) Cubic
(c) Hexagonal
(d) Triclinic

asked in Mechanical Paper-2, 2009

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81.

What is the expression for the strain energy due to bending of a cantilever beam (length L, modulus of elasticity E, and moment of inertia I)?
a. P²L³/3EI
b. P²L³/6EI
c. P²L³/4EI
d. P²L³/48EI

asked in Mechanical Paper-2, 2009

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82.

A steel specimen 150 mm² in cross-section stretches by 0.05 mm over a 50 mm gauge length under an axial load of 30 kN. What is the strain energy stored in the specimen?
(Take E =200 GPa)
(a) 0.75 N-m
(b) 1.00 N-m
(c) 1.50 N-m
(d) 3.00 N-m

asked in Mechanical Paper-2, 2009

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83.

Four vertical columns of same material, height and weight have the same end conditions. Which cross-section will carry the maximum load?
(a) Solid circular section
(b) Thin hollow circular section
(c) Solid square section
(d) l-section

asked in Mechanical Paper-2, 2009

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84.

A water main of 1 m diameter contains water at a pressure head of 100 m. The permissible tensile stress in the material of the water main is 25 MPa. What is the minimum thickness of the water main?
(Take g = 10 m/s²)
(a) 10 mm
(b) 20 mm
(c) 50 mm
(d) 60 mm

asked in Mechanical Paper-2, 2009

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