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Theory of Machine

Theory of Machine
The size of cam depends upon

Prime circle
Base circle
Pitch circle
Pitch curve

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Theory of Machine
A machine mounted on a single coil spring has a period of free vibration of tp . If the spring is cut into four equal parts and placed in parallel and the machine is mounted on them, then the period of free vibration of the new system will become

tp /4
4 tp
tp /16
16 tp

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Theory of Machine
The example of higher pair is

All of these
Gears, cams
Ball and roller bearings
Belt, rope and chain drives

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Theory of Machine
To obviate axial thrust, following gear drive is used

Single helical gear in which one of the teeth of helix angle a is more
Mutter gears
Double helical gears having opposite teeth
Double helical gears having identical teeth

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Theory of Machine
In S.H.M., the velocity vector w.r.t. displacement vector

Leads by 180°
Lags by 90°
Are in phase
Leads by 90°

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Theory of Machine
An engine operates between temperatures of 900°Kandr2 and another engine between T2 and 400°K For both to do equal work, value of T2 will be

650°K
600°K
700°K
625°K

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