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Theory of Machine

Theory of Machine
A slider crank chain consists of following numbers of turning and sliding pairs

1, 3
3, 1
4, 0
2, 2

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

¾μWR
μwr
²/₃ μWR
½μWR

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Theory of Machine
The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where l₁ and l₂ = Distance of two masses from the centre of gravity of the body, and kG = Radius of gyration of the body)

l₁l₂ = kG²
l₁ = kG
l₂ = kG
l₁l₂ = kG

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Theory of Machine
In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO. The acceleration of the piston P with respect to the crank-pin C is given by

ω² × QN
ω² × NO
ω² × CN
ω² × CO

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Theory of Machine
Which of the below are inversions of slider crank mechanism?
1. Oscillating cylinder engine mechanism
2. Toggle mechanism
3. Radial cylinder engine mechanism
4. Quick return mechanism

1, 3 and 4
1, 2 and 4
1, 2 and 3
2, 3 and 4

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Theory of Machine
The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to

90° and 180°
135° and 315°
270° and 360°
0° and 90°

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MORE MCQ ON Theory of Machine

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