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Theory of Machine

Theory of Machine
The number of links and instantaneous centers in a reciprocating engine mechanism are

5, 4
4, 6
4, 4
4, 5

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Theory of Machine
The mechanism forms a structure, when the number of degrees of freedom (n) is equal to

1
-1
2

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Theory of Machine
In a ball bearing, ball and bearing forms a

Screw pair
Rolling pair
Turning pair
Spherical pair

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Theory of Machine
A slider moves at a velocity v on a link revolving at ω rad/s. The coriolis component of acceleration is

2ωv²
ω²v
ωv
2ωv

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Theory of Machine
The instantaneous center of a rigid thin disc rolling on a plane rigid surface is located at

The point of contact
The center of the disc
The point on the circumference situated vertically opposite to the contact point
An infinite distance on the plane surface

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Theory of Machine
A simple spring-mass vibrating system has a natural frequency of fn. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become

4 fn
fn/2
2 fn
8 fn

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