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Engineering Mechanics

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

None of these
Unstable
Neutral
Stable

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Engineering Mechanics
Mass moment of inertia of a thin rod about its one end is ___________ the mass moment of inertia of the same rod about its mid-point

Twice
Four times
Same as
Thrice

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Engineering Mechanics
The maximum mechanical advantage of a lifting machine is

1 - m
1 / m
m
1 + m

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

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Engineering Mechanics
The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as

Coplanar non-concurrent forces
Coplanar concurrent forces
Unlike parallel forces
Like parallel forces

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Engineering Mechanics
The time of flight (t) of a projectile on an upward inclined plane is(where u = Velocity of projection, α = Angle of projection, and β = Inclination of the plane with the horizontal.)

t = 2u sin (α + β)/g cos β
t = g cos β/2u sin (α + β)
t = g cos β/2u sin (α - β)
t = 2u sin (α - β)/g cos β

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