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Theory of Machine

Theory of Machine
The lead screw of a lathe with nut forms a

Turning pair
Rolling pair
Sliding pair
Screw pair

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Theory of Machine
Which of the following disciplines provides study of relative motion between the parts of a machine?

Theory of machines
Mechanisms
Kinematics
Applied mechanics

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Theory of Machine
When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be

Stable
None of these
Unstable
Isochronous

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Theory of Machine
When the sleeve of a Porter governor moves downwards, the governor speed

First increases and then decreases
Increases
Decreases
Remain unaffected

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Theory of Machine
The lower pairs are _________ pairs.

None of these
Force-closed
Self-closed
Friction closed

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Theory of Machine
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the anticlockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

(ω₁ + ω₂) r
(ω₁ - ω₂) r
(ω₁ - ω₂) 2r
ω₁.ω₂.r

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