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Theory of Machine

Theory of Machine
When the speed of the engine fluctuates continuously above and below the mean speed, the governor is said to be

Unstable
Stable
Isochronous
Hunt

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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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Theory of Machine
The motion of a shaft in a circular hole is an example of

Incompletely constrained motion
None of these
Completely constrained motion
Successfully constrained motion

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Theory of Machine
When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a

Self-closed pair
Higher pair
Lower pair
Force-closed pair

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Theory of Machine
An automobile steering gear is an example of

Higher pair
Lower pair
Rolling pair
Sliding pair

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Theory of Machine
In a pantograph, all the pairs are

Turning pairs
Sliding pairs
Self-closed pairs
Spherical pairs

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