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Theory of Machine

Theory of Machine
In vibration isolation system, if ω/ωn > 1, then the phase difference between the transmitted force and the disturbing force is

270°
90°
0°
180°

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Theory of Machine
In a disc clutch, if there are n₁ number of discs on the driving shaft and n₂ number of discs on the driven shaft, then the number of pairs of contact surfaces will be

n₁ + n₂ - 2
n₁ + n₂ + 1
n₁ + n₂
n₁ + n₂ - 1

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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

0.5
1.5
2
1

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Theory of Machine
Which gear train is used for higher velocity ratios in a small space?

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

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Theory of Machine
If some links are connected such that motion between them can take place in more than one direction, it is called

Incompletely constrained motion
Completely constrained motion
Partially constrained motion
Successfully constrained motion

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Theory of Machine
The frictional torque transmitted in a conical pivot bearing, considering uniform wear, is

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

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