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Engineering Mechanics

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

Reversible
Non-reversible
None of these
Ideal

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Engineering Mechanics
The center of gravity of a quadrant of a circle lies along its central radius (r) at a distance of

0.6 r
0.5 r
0.7 r
0.8 r

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Engineering Mechanics
The velocity ratio for the first system of pulleys is (where n is the number of pulleys.)

n²
n
2n
2n - 1

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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 center of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius.

8r/3
4r/ 3π
3r/4π
3r/ 8

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Engineering Mechanics
In order to completely specify angular displacement by a vector, it must fix

Sense of angular displacement
Direction of the axis of rotation
Magnitude of angular displacement
All of these

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