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Engineering Mechanics

Engineering Mechanics
The maximum efficiency of a lifting machine is

m/V.R.
V.R./m
1/(m × V.R.)
1/m

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Engineering Mechanics
The periodic time of one oscillation for a simple pendulum is (where l = Length of the pendulum.)

(1/2π). √(l/g)
None of these
2π. √(l/g)
(1/2π). √(g/l)

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Engineering Mechanics
The angle between two forces when the resultant is maximum and minimum respectively are

180° and 0°
90° and 0°
90° and 180°
0° and 180°

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Engineering Mechanics
A smooth cylinder lying on a __________ is in neutral equilibrium.

Curved surface
Horizontal surface
Convex surface
None of these

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Engineering Mechanics
If a number of coplanar forces acting at a point be in equilibrium, the sum of clockwise moments must be __________ the sum of anticlockwise moments, about any point.

Greater than
Less than
None of these
Equal to

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Engineering Mechanics
The linear velocity of a body rotating at ω rad/s along a circular path of radius r is given by

ω²/r
ω/r
ω².r
ω.r

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