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Engineering Mechanics

Engineering Mechanics
When a body of mass 'm' attains a velocity 'v' from rest in time 't', then the kinetic energy of translation is

0.5 mv2
0.5 mgv2
mgv2
mv2

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Engineering Mechanics
In order to completely specify angular displacement by a vector, it must fix

Sense of angular displacement
Magnitude of angular displacement
All of these
Direction of the axis of rotation

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Engineering Mechanics
In a screw jack, the effort required to lower the load is __________ the effort required to raise the same load.

Equal to
None of these
More than
Less than

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Engineering Mechanics
An ideal machine is one whose efficiency is

Between 80 and 90%
1
Between 70 and 80%
Between 60 and 70 %

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

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Engineering Mechanics
If a number of forces are acting at a point, their resultant is given by

(∑V)2 + (∑H)2
√[(∑V)2 +(∑H)2 +2(∑V)(∑H)]
√[(∑V)2 + (∑H)2]
(∑V)2 +(∑H)2 +2(∑V)(∑H)

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