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Theory of Machine

Theory of Machine
Cylindrical cams can be classified as

None of these
Tangent
Reciprocating
Circular

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Theory of Machine
If ω/ωn is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

360°
0°
180°
90°

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Theory of Machine
The frictional torque transmitted in a flat pivot bearing, assuming uniform wear, is(Where μ = Coefficient of friction, W=Load over the bearing, R=Radius of bearing)

μwr
²/₃ μWR
½μWR
¾μWR

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Theory of Machine
When the sleeve of a Porter governor moves downwards, the governor speed

Remain unaffected
Increases
Decreases
First increases and then decreases

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Theory of Machine
A watt's governor can work satisfactorily at speeds from

200 to 300 r.p.m.
60 to 80 r.p.m.
100 to 200 r.p.m.
80 to 100 r.p.m.

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Theory of Machine
A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the

Magnitude of the forces on journal
Angular velocity of journal
Radius of journal
Clearance between journal and bearing

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