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Theory of Machine

Theory of Machine
The relation between number of pairs (p) forming a kinematic chain and the number of links (l) is

l = 2p - 4
l = 2p - 2
l = 2p - 5
l = 2p - 3

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Theory of Machine
Whitworth quick return mechanism is obtained by inversion of

Kinematic chain
Roller cam mechanism
Slider crank mechanism
Five link mechanism

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Theory of Machine
The balancing weights are introduced in planes parallel to the plane of rotation of the disturbing mass. To obtain complete dynamic balance, the minimum number of balancing weights to be introduced in different planes is

3
1
4
2

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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)

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

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Theory of Machine
In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from

70°- 80°
50°- 60°
60°-70°
80°- 90°

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Theory of Machine
In a four stroke I.C. engine, the turning moment during the compression stroke is

Negative during major portion of the stroke
Negative throughout
Positive throughout
Positive during major portion of the stroke

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