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55.

Oldham's coupling is the

A.	second inversion of double slider crank chain	B.	third inversion of double slider crank chain
C.	second inversion of single slider crank chain	D.	third inversion of slider crank chain

56.

Open pairs are those which have

A.	point or line contact between the two elements when in motion	B.	surface contact between the two elements when in motion
C.	elements of pairs not held together mechanically	D.	two elements that permit relative motion

57.

Peaucellier mechanism has

A.	eight links	B.	six links
C.	four links	D.	twelve links

58.

Pitch point on a cam is

A.	any point on pitch curve	B.	the point on cam pitch curve having the maximum pressure angle
C.	any point on pitch circle	D.	the point on cam pitch curve having the minimum pressure angle

59.

Rectangular bar in a rectangular hole is the following type of pair

A.	completely constrained motion	B.	partially constrained motion
C.	incompletely constrained motion	D.	freely constrained motion

60.

Rectilinear motion of piston is converted into rotary by

A.	cross head	B.	slider crank
C.	connecting rod	D.	gudgeon pin

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