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Theory of Machine

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

All of these
Pitching
Rolling
Steering

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Theory of Machine
A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the

Angular velocity of journal
Radius of journal
Clearance between journal and bearing
Magnitude of the forces on journal

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Theory of Machine
The Ackermann steering mechanism is preferred to the Davis type in automobiles because

The former is having turning pair
The former is mathematically accurate
The former is most rigid
The former is most economical

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Theory of Machine
The acceleration of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by

ω². (r₁ - r₂). (1 - sin² θ)
ω². (r₁ + r₂). (1 + cos² θ)
ω². (r₁ r₂). (1 - cos² θ)
ω². (r₁ + r₂). [(2 - cos² θ)/cos³ θ]

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Theory of Machine
The number of centers in a crank driven slider crank mechanism is

4
2
6

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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) 2r
(ω₁ + ω₂) r
(ω₁ - ω₂) r

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