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Theory of Machine

Theory of Machine
The lower pairs are _________ pairs.

Self-closed
Friction closed
Force-closed
None of these

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

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Theory of Machine
In S.H.M., the velocity vector w.r.t. displacement vector

Lags by 90°
Leads by 180°
Leads by 90°
Are in phase

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Theory of Machine
Length of arc of contact is given by

Arc of approach / Arc of recess
Arc of approach + Arc of recess
Arc of approach × Arc of recess
Arc of approach - Arc of recess

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Theory of Machine
Any point on a link connecting double slider crank chain will trace a

Straight line
Ellipse
Circle
Parabola

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Theory of Machine
If some links are connected such that motion between them can take place in more than one direction, it is called

Partially constrained motion
Successfully constrained motion
Incompletely constrained motion
Completely constrained motion

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