Theory of Machine
In gears, interference takes place when

Gears do not move smoothly in the absence of lubrication
The tip of a tooth of a mating gear digs into the portion between base and root circles
Gear teeth are undercut
Pitch of the gears is not same

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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?

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

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