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Theory of Machine

Theory of Machine
If two moving elements have surface contact in motion, such pair is known as

Surface pair
Higher pair
Sliding pair
Rolling pair

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

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

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Theory of Machine
The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as

Rolling pair
Turning pair
Sliding pair
Spherical pair

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Theory of Machine
The Scott-Russell mechanism consists of

Sliding and rotary pairs
Sliding pairs only
Turning and rotary pairs
Sliding and turning pairs

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Theory of Machine
The velocity of sliding of meshing gear teeth is (Where ω₁ and ω₂ are angular velocities of meshing gears and ‘y’ is distance between point of contact and the pitch point)

(ω₁ + ω₂) y
(ω₁/ω₂) y
(ω₁ + ω₂)/y
(ω₁ × ω₂) y

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Theory of Machine
The frictional torque transmitted in a conical pivot bearing, considering uniform pressure, is (where R = Radius of shaft, and α = Semi-angle of the cone)

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

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