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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

Non-reversible
Reversible
Ideal
None of these

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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
If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys.

None of these
First
Second
Third

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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.

3r/ 8
3r/4π
4r/ 3π
8r/3

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Engineering Mechanics
The friction experienced by a body, when at rest, is known as

Static friction
Coefficient of friction
Limiting friction
Dynamic friction

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

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

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