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Theory of Machine

Theory of Machine
Ackermann steering gear consists of

Turning pairs
Sliding pairs
Rolling pairs
Higher pairs

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Theory of Machine
The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)

(3/4) μ W R
(2/3) μ W R
(1/2) μ W R
μ W R

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Theory of Machine
The main disadvantage of the sliding pair is that it is

Difficult to manufacture
Bulky
Wears rapidly
Both (A) and (B) above

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Theory of Machine
Sense of tangential acceleration of a link

Is same as that of velocity
Could be either same or opposite to velocity
Is opposite to that of velocity
Is perpendicular to that of velocity

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Theory of Machine
When the nature of contact between the elements of a pair is such that one element can turn about the other by screw threads, the pair is known as a

Screw pair
Sliding pair
Spherical pair
Turning pair

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Theory of Machine
The arrangement is called bevel gearing, when two __________ are connected by gears.

Parallel and coplanar shafts
Intersecting and coplanar shafts
Non-intersecting and non-coplanar shafts
Parallel and non-coplanar shafts

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