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Engineering Mechanics

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

Curved surface
Horizontal surface
None of these
Convex surface

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Engineering Mechanics
In order to double the period of simple pendulum, the length of the string should be

Halved
None of these
Quadrupled
Doubled

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Engineering Mechanics
A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is

None of these
Non-reversible
Reversible
Ideal

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Engineering Mechanics
The maximum mechanical advantage of a lifting machine is

m
1 + m
1 / m
1 - m

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Engineering Mechanics
The time of flight of a projectile on downward inclined plane depends upon

Both (A) and (B)
None of these
Angle of inclination of the plane
Angle of projection

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Engineering Mechanics
In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)

P = W tan (φ - α)
P = W tan (α + φ)
P = W cos (α + φ)
P = W tan (α - φ)

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