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Engineering Mechanics

Engineering Mechanics
In ideal machines, mechanical advantage is __________ velocity ratio.

Greater than
Equal to
Less than
None of these

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Engineering Mechanics
If a number of forces are acting at a point, their resultant will be inclined at an angle 'θ' with the horizontal, such that

tanθ = ΣV × ΣH
tanθ = √(ΣV + ΣH)
tanθ = ΣV/ΣH
tanθ = ΣH/ΣV

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Engineering Mechanics
According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through center of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)

IP = IG - Ah2
IP = IG + Ah2
IP = IG / Ah2
IP = Ah2 / IG

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Engineering Mechanics
The linear velocity of a body rotating at ω rad/s along a circular path of radius r is given by

ω².r
ω²/r
ω.r
ω/r

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Engineering Mechanics
The velocity ratio of a single purchase crab winch can be increased by

All of these
Increasing the length of the handle
Increasing the radius of the load drum
Increasing the number of teeth of the pinion

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Engineering Mechanics
The velocity ratio of a first system of pulleys with 4 pulleys is

4
16
8
20

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