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Engineering Mechanics

Engineering Mechanics
The coefficient of friction depends upon

Nature of surfaces
All of these
Area of contact
Shape of the surfaces

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Engineering Mechanics
A screw jack used for lifting the loads is

An ideal machine
None of these
A reversible machine
A non-reversible machine

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Engineering Mechanics
The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.

None of these
Greater than
Less than
Equal to

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Engineering Mechanics
The mechanical advantage of a lifting machine is the ratio of

Output to the input
Distance moved by effort to the distance moved by load
All of these
Load lifted to the effort applied

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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
3r/ 8
4r/ 3π
3r/4π

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Engineering Mechanics
When a body of mass moment of inertia 'I' (about a given axis) is rotated about that axis with an angular velocity to, then the kinetic energy of rotation is

Iω2
0.5 Iω
0.5 Iω2
Iω

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