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Theory of Machine

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

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

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Theory of Machine
The rotating shafts tend to vibrate violently at whirling speeds because

Bearing centre line coincides with the axis
The system is unbalanced
The shafts are rotating at very high speeds
Resonance is caused due to the heavy mass of the rotor

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Theory of Machine
In a kinematic chain, a quaternary joint is equivalent to

Four binary joints
Two binary joints
One binary joint
Three binary joints

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Theory of Machine
The lower pair is a

Point contact pair
Open pair
Closed pair
Sliding pair

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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)
log(x₁/x₂)
x₁/x₂

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Theory of Machine
In a Hartnell governor, the compression of the spring is __________ the lift of the sleeve.

Equal to
Less than
Greater than
None of these

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