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Engineering Mechanics - Interview Questions and Answers

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46. 89. Coulomb friction is the friction between
A. bodies having relative motion
B. two dry surfaces
C. two lubricated surfaces
D. solids and liquids
E. electrically charged particles.
Explanation:
47. 68. Angle oT friction is the
A. angle between normal reaction and the resultant of normal reaction and the limiting friction
B. ratio of limiting friction and normal reaction
C. he ratio of minimum friction force to the friction force acting when the body is just about to move
D. the ratio of minimum friction force to friction force acting when the body is in motion
E. ratio of static and dynamic friction.
Explanation:
48. 77. Coefficient of friction is the
A. angle between normal reaction and the resultant of normal reaction and the limiting friction
B. ratio of limiting friction and normal reaction
C. the friction force acting when the body is just about to move
D. the friction force acting when the body is in motion
E. tangent of angle of repose.
Explanation:
49. 90. Dynamic friction as compared to static friction is
A. same
B. more
C. less
D. may be less of more depending on na-ture of surfaces and velocity
E. has no correlation.
Explanation:
50. 80. A particle moves along a straight line such that distance (x) traversed in t seconds is given by x = t2 (t - 4), the acceleration of the particle will be given by the equation
A. 3t2-lt
B. 3t2+2t
C. 6f-8
D. 6f-4
E. 6t2-8t.
Explanation:
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