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

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

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Engineering Mechanics
Non-coplanar concurrent forces are those forces which

Meet at one point, but 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 and their lines of action do not 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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