Theory of Machine
Angular acceleration of a link can be determined by dividing the

Tangential component of acceleration with length of link
All of these
Centripetal component of acceleration with length of link
Resultant acceleration with length of link

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Theory of Machine
Which of the following statement is correct as regard to the difference between a machine and a structure?

All of these
The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only
A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work
The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another

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Theory of Machine
Open pairs are those which have

Point or line contact between the two elements when in motion
Two elements that permit relative motion
Surface contact between the two elements when in motion
Elements of pairs not held together mechanically

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