Theory of Machine
When the two elements of a pair have __________ when in motion, it is said to a lower pair.

Surface contact
Body contact
Line or point contact
None of these

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

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

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