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Engineering Mechanics

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

Convex surface
Curved surface
None of these
Horizontal surface

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Engineering Mechanics
The range of projectile will be maximum for a given velocity of projectile, when the angle of projection (α) is

45° + β/2
60° + β/2
β/2
30° + β/2

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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.

Less than
Equal to
None of these
Greater than

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Engineering Mechanics
On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be

Zero at its upper end
Upwards at its upper end
Perpendicular to the wall at its upper end
Downwards at its upper end

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

Stable
Neutral
None of these
Unstable

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Engineering Mechanics
A machine having an efficiency greater than 50%, is known as

Neither reversible nor non-reversible machine
Non-reversible machine
Reversible machine
Ideal machine

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