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Theory of Machine

Theory of Machine
What is the number of instantaneous centers for an eight link mechanism?

15
28
8
30

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Theory of Machine
The Kutzbach criterion for determining the number of degrees of freedom (n) is (where l = number of links, j = number of joints and h = number of higher pairs)

n = 3(l - 1) - 2j - h
n = 2(l - 1) - 3j - h
n = 3(l - 1) - 3j - h
n = 2(l - 1) - 2j - h

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Theory of Machine
In a gear having involute teeth, the normal to the involute is a tangent to the

Addendum circle
Pitch circle
Base circle
Dedendum circle

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Theory of Machine
When the nature of contact between the elements of a pair is such that it can only slide relative to the other, the pair is known as a

Turning pair
Spherical pair
Sliding pair
Screw pair

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Theory of Machine
The example of successfully constrained motion is a

Motion of an I.C. engine valve
Piston reciprocating inside an engine cylinder
All of these
Motion of the shaft between a footstep bearing

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Theory of Machine
In a spring controlled governor, when the controlling force ____ as the radius of rotation increases, it is said to be a stable governor.

Increases
Remains constant
Decreases
None of the listed here

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