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Engineering Mechanics

Engineering Mechanics
The velocity ratio of a differential pulley block with D and d as the diameters of larger and smaller pulley, is

D/(D - d)
2D/(D + d)
D/(D + d)
2D/(D - d)

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Engineering Mechanics
For a self locking machine, the efficiency must be

Equal to 50%
Less than 50%
1
Greater than 50%

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Engineering Mechanics
The mechanical advantage of a lifting machine is the ratio of

Load lifted to the effort applied
Output to the input
All of these
Distance moved by effort to the distance moved by load

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Engineering Mechanics
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

6f - 4
6t² - 8t
3t² + 2t
6f - 8

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Engineering Mechanics
The C.G. of a solid hemisphere lies on the central radius 3r

At distance — from the plane base
At distance — from the plane base 3r
At distance — from the plane base 3r
At distance — from the plane base 3r

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Engineering Mechanics
The maximum acceleration of a particle moving with simple harmonic motion is

ω/r
ω
ωr
ω²r

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