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Theory of Machine

Theory of Machine
The velocity of the rubbing surface __________ with the distance from the axis of the bearing.

None of these
Remain same
Decreases
Increases

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Theory of Machine
The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m).(dx/dt) + (s/m).x = 0, if the roots of the equation are __________ then the system will be under damped.

Complex conjugate
Real
Equal
None of these

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Theory of Machine
The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing)

r tanφ
r sinφ
(r/2) cosφ
r cosφ

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Theory of Machine
The example of spherical pair is

Ball bearing and roller bearing
Bolt and nut
Ball and socket joint
Lead screw of a lathe

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Theory of Machine
The relation between number of links (l) and number of joints (j) in a kinematic chain is

l = j + 4
l = (1/2).(j + 2)
l = (2/3).(j + 2)
l = (3/4).(j + 3)

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Theory of Machine
Instantaneous center of rotation of a link in a four bar mechanism lies on

A point obtained by intersection on extending adjoining links
Left side pivot of this link
Can’t occur
Right side pivot of this link

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