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Engineering Mechanics

Engineering Mechanics
The velocity ratio for the third system of pulleys is

n
2n - 1
n²
2n

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Engineering Mechanics
The efficiency of a lifting machine is the ratio of

All of these
Output to the input
Work done by the machine to the work done on the machine
Mechanical advantage to the velocity ratio

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Engineering Mechanics
The skidding away of the vehicle on a level circular path can be avoided if the force of friction between the wheels and the ground is __________ the centrifugal force.

Less than
None of these
Equal to
Greater than

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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

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

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Engineering Mechanics
The moment of inertia of a square of side a about its diagonal is

a⁴/12
a⁴/16
a³/12
a²/8

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Engineering Mechanics
The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by

Q / P
P - Q
P + Q
P / Q

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