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Theory of Machine

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

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

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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

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

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Theory of Machine
Which of the following is a pendulum type governor?

Porter governor
Watt governor
Hartnell governor
None of these

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Theory of Machine
A disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively)

m₁ r₂ = m₂ r₁
m₁ r₁ = m₂ r₂
m₁ m₂ = r₁ r₂
None of these

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Theory of Machine
The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (θ) is equal to

180° and 270°
270° and 360°
45° and 225°
90° and 180°

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Theory of Machine
Which of the following disciplines provides study of relative motion between the parts of a machine?

Theory of machines
Mechanisms
Applied mechanics
Kinematics

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