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Theory of Machine

Theory of Machine
If the number of links in a mechanism is equal to l, then the numbers of possible inversions are equal to

l + 1
l - 1
l - 2
l

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Theory of Machine
In an open pair, the two elements of a pair

Have a surface contact when in motion
Are kept in contact by the action of external forces, when in motion
Are not held together mechanically
Have a line or point contact when in motion

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Theory of Machine
The frictional torque transmitted in a conical pivot bearing, considering uniform pressure, is (where R = Radius of shaft, and α = Semi-angle of the cone)

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

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Theory of Machine
The frequency of damped vibrations with viscous damping is ________ the frequency of undamped vibrations.

None of these
More than
Less than
Same as

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Theory of Machine
In under damped vibrating system, if x₁ and x₂ are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to

loge(x₁/x₂)
log(x₁/x₂)
x₁/x₂
log(x₁.x₂)

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Theory of Machine
Torsional vibrations are said to occur when the particles of a body moves

In a circle about its axis
None of these
Perpendicular to its axis
Parallel to its axis

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