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Engineering Mechanics

Engineering Mechanics
A screw jack used for lifting the loads is

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

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Engineering Mechanics
The moment of inertia of a thin disc of mass ‘m’ and radius ‘r’, about an axis through its center of gravity and perpendicular to the plane of the disc is

mr²/6
mr²/2
mr²/4
mr²/8

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Engineering Mechanics
The moment of inertia of a square of side (a) about an axis through its center of gravity is

a4/36
a4/12
a4/4
a4/8

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Engineering Mechanics
When the spring of a watch is wound, it will possess

Strain energy
Electrical energy
Kinetic energy
Heat energy

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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 number of teeth of the pinion
Increasing the radius of the load drum

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Engineering Mechanics
Two forces are acting at an angle of 120°. The bigger force is 40 N and the resultant is perpendicular to the smaller one. The smaller force is

20 N
40 N
120 N
None of the listed here

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