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Theory of Machine

Theory of Machine
In a ball bearing, ball and bearing forms a

Turning pair
Screw pair
Rolling pair
Spherical pair

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Theory of Machine
The direction of linear velocity of any point on a link with respect to another point on the same link is

At 45° to the link joining the points
None of the listed here
Perpendicular to the link joining the points
Parallel to the link joining the points

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Theory of Machine
Peaucellier’s mechanism has

Four links
Twelve links
Six links
Eight links

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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 clockwise 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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Theory of Machine
The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship.

Horizontally and perpendicular
Horizontally and parallel
Vertically and perpendicular
Vertically and parallel

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Theory of Machine
The tendency of a body to resist change from rest or motion is known as

Mass
Resisting force
Inertia
Friction

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