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Theory of Machine

Theory of Machine
A cam mechanism imparts following motion

All of these
Oscillating
Reciprocating
Rotating

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Theory of Machine
Which type of gear train is used in clock mechanism to join hour hand and minute hand?

Reverted gear train
Epicyclic gear train
Compound gear train
Simple gear train

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Theory of Machine
The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)

(3/4) μ W R
(2/3) μ W R
(1/2) μ W R
μ W R

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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) 2r
ω₁.ω₂.r
(ω₁ + ω₂) r
(ω₁ - ω₂) r

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Theory of Machine
A completely constrained motion can be transmitted with.

3 links with pin joints
2 links with pin joints
1 link with pin joints
4 links with pin joints

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Theory of Machine
The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft, and I = Mass moment of inertia of the disc attached at the end of a shaft)

2π qI
1/2π
2π. √(q/I)
(1/2π). √(q/I)

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