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Engineering Mechanics

Engineering Mechanics
The center of percussion of a solid cylinder of radius ‘r’ resting on a horizontal plane will be

3r/2
r/2
r/A
2r/3

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Engineering Mechanics
Tension in the cable supporting a lift is more when the lift is moving __________ with an acceleration.

Upwards
Horizontal
Downwards
None of these

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Engineering Mechanics
An ideal machine is one whose efficiency is

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

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Engineering Mechanics
The forces which do not meet at one point and their lines of action do not lie on the same plane are known as

None of these
Coplanar non-concurrent forces
Non-coplanar concurrent forces
Coplanar concurrent forces

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Engineering Mechanics
A smooth cylinder lying on its convex surface remains in __________ equilibrium.

Unstable
Stable
Neutral
None of these

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Engineering Mechanics
Two like parallel forces are acting at a distance of 24 mm apart and their resultant is 20 N. It the line of action of the resultant is 6 mm from any given force, the two forces are

15 N and 15 N
20 N and 5 N
15 N and 5 N
None of these

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