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

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

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Engineering Mechanics
The term 'Centroid' is

The point of suspension
None of the listed here
The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
The same as centre of gravity

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