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Engineering Mechanics - Interview Questions and Answers

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56. 5. Forces are called coplanar when all of them acting on body lie in
A. one point
B. one plane
C. different planes
D. perpendicular planes
E. different points.
Explanation:
57. 81. If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella
A. more inclined when moving
B. less inclined when moving
C. more inclined when standing
D. less inclined when standing
E. none of the above.
Explanation:
58. 78. Pick up wrong statement about friction force for dry surfaces. Friction force is
A. proportional to normal load between the surfaces
B. dependent on the materials of contact surface
C. proportional to velocity of sliding
D. independent of the area of contact sur-faces
E. none of the above is wrong statement.
Explanation:
59. 65. The resultant of the following three couples 20 kg force, 0.5 m arm, $ ve sense 30 kg force, 1 m arm, - ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be
A. 20 kg, - ve sense
B. 20 kg, + ve sense
C. 10 kg, + ve sense
D. 10 kg, - ve sense
E. 45 kg, + ve sense.
Explanation:
60. The effort required to lift a load W on a screw jack with helix angle a and angle of friction
A. Wtan(a + <)>)
B. Wtan(a-<)>)
C. Wcos(a + )
D. Wsin(a + <(>)
E. W (sin a + cos ).
Explanation:
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