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Theory of Machine

Theory of Machine
A mechanism is an assemblage of

Four or more than four links
Two links
Three links
All of these

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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

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

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Theory of Machine
Which of the following is a spring controlled governor?

Hartung governor
All of these
Wilson-Hartnell governor
Hartnell governor

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Theory of Machine
A spring controlled governor is said to be unstable when the controlling force

Decreases as the radius of rotation increases
Increases as the radius of rotation decreases
Increases as the radius of rotation increases
Remains constant for all radii of rotation

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

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

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Theory of Machine
Which one of the following is an exact straight line mechanism using lower pairs?

Grasshopper mechanism
Watt’s mechanism
Peaucellier’s mechanism
Robert’s mechanism

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