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Theory of Machine

Theory of Machine
If the opposite links of a four bar linkage are equal, the links will always form a

Rectangle
Pentagon
Triangle
Parallelogram

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Theory of Machine
A body having moment of inertia o:m2 is rotating at 210 RPM and r with another body at rest having I 40 kg m2. The resultant speed after ing will be

90 RPM
data are insufficient
80 RPM
100 RPM

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Theory of Machine
The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose)

ω² × OQ cosθ
ω² × OQ tanθ
ω² × OQ
ω² × OQ sinθ

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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)2r
(ω₁ - ω₂)r
ω₁.ω₂.r

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Theory of Machine
To obviate axial thrust, following gear drive is used

Double helical gears having opposite teeth
Mutter gears
Single helical gear in which one of the teeth of helix angle a is more
Double helical gears having identical teeth

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Theory of Machine
A body will begin to move down an inclined plane, if the angle of inclination of the plane is ________ the angle of friction.

Greater than
Equal to
Less than
None of these

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