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Theory of Machine

Theory of Machine
If ω/ωn = 2, where co is the frequency of excitation and ωn is the natural frequency of vibrations, then the transmissibility of vibration will the

1.5
1
2
0.5

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

Pentagon
Rectangle
Parallelogram
Triangle

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Theory of Machine
The fundamental equation for correct steering is (where φ and α = Angle through which the axis of the outer wheel and inner wheel turns respectively, c = Distance between the pivots of the front axles, and d = Wheel base)

cotφ - cotα = c/b
sinφ + sinα = b/c
cosφ - sinα = c/b
tanφ + cotα = b/c

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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 × CN
ω² × CO
ω² × NO

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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
μ W R
(2/3) μ W R
(1/2) μ W R

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Theory of Machine
Which of the following is an open pair?

Ball and socket joint
Cam and follower
Lead screw and nut
Journal bearing

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