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

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

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

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

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