Engineering Mechanics
A machine having an efficiency less than 50%, is known as

Ideal machine
Neither reversible nor non-reversible machine
Reversible machine
Non-reversible machine

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Engineering Mechanics
Coplanar concurrent forces are those forces which

Meet at one point, but their lines of action do not lie on the same plane
Do not meet at one point and their lines of action do not lie on the same plane
Meet at one point and their lines of action also lie on the same plane
Do not meet at one point, but their lines of action lie on the same plane

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Engineering Mechanics
For any system of coplanar forces, the condition of equilibrium is that the

Algebraic sum of the horizontal components of all the forces should be zero
Algebraic sum of the vertical components of all the forces should be zero
All of these
Algebraic sum of moments of all the forces about any point should be zero

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