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Theory of Machine

Theory of Machine
Carnot cycle is

an irreversible cycle
a quasi static cycle
a semi-reversible cycle
a reversible cycle

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Theory of Machine
In its simplest form, a cam mechanism consists of following number of links

3
1
2
4

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Theory of Machine
Length of arc of contact is given by

Arc of approach / Arc of recess
Arc of approach × Arc of recess
Arc of approach - Arc of recess
Arc of approach + Arc of recess

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Theory of Machine
In an open pair, the two elements of a pair

Are kept in contact by the action of external forces, when in motion
Have a line or point contact when in motion
Have a surface contact when in motion
Are not held together mechanically

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Theory of Machine
The example of spherical pair is

Ball bearing and roller bearing
Ball and socket joint
Bolt and nut
Lead screw of a lathe

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Theory of Machine
In a Hartnell governor, the stiffness of the spring is given by (where S1 and S2 = Spring forces exerted on the sleeve at max. and min. radii of rotation, and h = Compression of the spring)

(S₁ + S₂) / 2h
(S₁ + S₂) / h
(S₁ - S₂) / 2h
(S₁ - S₂) / h

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