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Engineering Mechanics

Engineering Mechanics
An ideal machine is one whose efficiency is

Between 80 and 90%
Between 60 and 70 %
1
Between 70 and 80%

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Engineering Mechanics
Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to

Half the area of the triangle
Area of the triangle
Twice the area of the triangle
None of these

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Engineering Mechanics
In actual machines, mechanical advantage is _________ velocity ratio.

None of these
Equal to
Less than
Greater than

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

16
20
4
8

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Engineering Mechanics
The units of moment of inertia of mass are

kg/m²
m²/kg
kg/m
kg-m²

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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

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

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