Theory of Machine
When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a

Self-closed pair
Lower pair
Higher pair
Force-closed pair

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Theory of Machine
The Klein's method of construction for reciprocating engine mechanism

Is a simplified form of instantaneous center method
Is based on acceleration diagram
Utilizes a quadrilateral similar to the diagram of mechanism for reciprocating engine
Enables determination of Cariole’s component

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Theory of Machine
A thin circular disc is rolling with a uniform linear speed, along a straight path on a plane surface. Which of the following statement is correct in this regard?

The centre of the disc has centrifugal acceleration
The point on the disc making contact with the plane surface has zero acceleration
The centre of the disc has zero acceleration
All points of the disc have the same velocity

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