Theory of Machine
When the two elements of a pair have __________ when in motion, it is said to a lower pair.

Surface contact
None of these
Line or point contact
Body contact

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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
A body in motion will be subjected to Coriolis acceleration when that body is

In plane translation with variable velocity
Restrained to rotate while sliding over another body
In plane motion which is a resultant of plane translation and rotation
In plane rotation with variable velocity

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