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Theory of Machine

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

Rolling pair
Higher pair
Sliding pair
Surface pair

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Theory of Machine
The mechanism consisting of three turning pairs and one sliding pair, is called a

Single slider crank chain
All of these
Whitworth quick return motion mechanism
Crank and slotted lever quick return motion mechanism

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Theory of Machine
When two links are connected by a pin joint, their instantaneous center lies

At the pin joint
At the center of curvature
On their point of contact
At the center of circle

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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)2r
(ω₁ + ω₂)r
(ω₁ - ω₂)r
ω₁.ω₂.r

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Theory of Machine
When a point moves along a straight line, its acceleration will have

Radial and tangential components both
Tangential component only
Radial component only
Coriolis component only

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Theory of Machine
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The minimum length of the coupler will be

45 mm
Slightly more than 45 mm
Slightly less than 45 mm
95 mm

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