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Theory of Machine

Theory of Machine
If there are L number of links in a mechanism, then number of possible inversions is equal to

L - 1
L + 1
L
L + 2

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Theory of Machine
The two elements of a pair are said to form a higher pair, when they

Are kept in contact by the action of external forces, when in motion
Have a surface contact when in motion
Have a line or point contact when in motion
Permit relative motion

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Theory of Machine
When a ship travels in a sea, which of the effect is more dangerous

Rolling
Pitching
All of these
Steering

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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)r
(ω₁ - ω₂)2r

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Theory of Machine
Peaucellier’s mechanism has

Six links
Twelve links
Four links
Eight links

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Theory of Machine
The two elements of a pair are said to form a _________ when they permit relative motion between them.

None of these
Sliding pair
Open pair
Kinematic pair

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