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Engineering Mechanics

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

Neutral
Stable
Unstable
None of these

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Engineering Mechanics
Static friction is always __________ dynamic friction.

Greater than
Less than
Equal to
None of these

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

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

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Engineering Mechanics
In a single threaded worm and worm wheel, the number of teeth on the worm is 50. The diameter of the effort wheel is 100 mm and that of load drum is 50 mm. The velocity ratio is

100
200
50
400

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Engineering Mechanics
If u₁ and u₂ are the velocities of two moving bodies in the same direction before impact and v₁ and v₂ are their velocities after impact, then coefficient of restitution is given by

(u₁ - u₂)/(v₁ - v₂)
(v₁ - v₂)/(u₁ - u₂)
(v₂ - v₁)/(u₁ - u₂)
(u₂ + u₁)/(v₂ + v₁)

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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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