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

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

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Engineering Mechanics
Non-coplanar non-concurrent forces are those forces which

Do not meet at one point but their lines of action lie on the same plane
None of these
Do not meet at one point and their lines of action do not lie on the same plane
Meet at one point, but their lines of action do not lie on the same plane

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Engineering Mechanics
Which is the correct statement about law of polygon of forces?

If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium
If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium
If a polygon representing forces acting at a point is closed then forces are in equilibrium
If any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium

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