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Theory of Machine

Theory of Machine
What is the number of instantaneous centers for an eight link mechanism?

28
15
8
30

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Theory of Machine
The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship.

Vertically and perpendicular
Horizontally and perpendicular
Vertically and parallel
Horizontally and parallel

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Theory of Machine
In a locomotive, the maximum magnitude of the unbalanced force along the perpendicular to the line of stroke, is known as

Swaying couple
None of these
Hammer blow
Tractive force

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

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

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Theory of Machine
The acceleration of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by

ω². (r₁ + r₂). [(2 - cos² θ)/cos³ θ]
ω². (r₁ - r₂). (1 - sin² θ)
ω². (r₁ r₂). (1 - cos² θ)
ω². (r₁ + r₂). (1 + cos² θ)

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Theory of Machine
An eccentric sheave pivoted at one point rotates and transmits oscillatory motion to a link whose one end is pivoted and other end is connected to it. This mechanism has

2 links
3 links
4 links
5 links

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