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

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

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Engineering Mechanics
Non-coplanar non-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 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

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