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Engineering Mechanics - Interview Questions and Answers

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81. 97. A particle inside a hollow sphere of radius r, having coefficient of friction -rr can rest upto height of
A. r/2
B. r/A
C. r/%
D. 0.134 r
E. 3r/8.
Explanation:
82. 130. In actual machines
A. mechanical advantage is greater than velocity ratio
B. mechanical advantage is equal to velocity ratio
C. mechanical advantage is less than velocity ratio
D. mechanical advantage is unity
E. none of the above.
Explanation:
83. 104. The necessary condition for forces to be in equilibrium is that these should be
A. coplanar
B. meet at one point ;
C. both (a) and (b) above
D. all be equal
E. something else.
Explanation:
84. 131. In ideal machines
A. mechanical advantage is greater than velocity ratio
B. mechanical advantage is equal to velocity ratio
C. mechanical advantage is less than velocity ratio
D. mechanical advantage is unity
E. none of the above.
Explanation:
85. 102. The co-efficient of friction depends upon
A. nature of surfaces
B. , area of contact
C. shape of the surfaces
D. ail of the above.
E. (a) and (b) above.
Explanation:
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