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19.

Which of the following mechanisms produces mathematically an exact straight line motion                        
A. Grasshopper mechanism B. Watt mechanism
C. Peaucellier's mechanism D. Tchabichiff mechanism



20.

Whitworth quick return mechanism is obtained by inversion of                        
A. slider crank mechanism B. kinematic chain
C. five link mechanism D. roller cam mechanism



21.

A cam mechanism imparts following motion                        
A. rotating B. oscillating
C. reciprocating D. all of the above




22.

A cam with a roller follower would con statute following type of pair                        
A. lower pair B. higher pair
C. open pair D. close pair



23.

A chain comprises of 5 links having 5 joints. Is it kinematic chain ?                        
A. yes B. no
C. it is a marginal case D. data are insufficient to determine it



24.

A circular bar moving in a round hole is an example of                        
A. incompletely constrained motion B. partially constrained motion
C. completely constrained motion D. successfully constrained motion



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