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Theory of Machine

Theory of Machine
The acceleration of the particle moving with simple harmonic motion is _________ at the mean position.

Minimum
Zero
None of these
Maximum

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Theory of Machine
The frictional torque transmitted in a flat pivot bearing with assumption of uniform pressure is _________ as compared to uniform wear.

Less
Same
More
None of the listed here

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

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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)

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

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Theory of Machine
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

(ω₁ - ω₂)r
(ω₁ - ω₂)2r
(ω₁ + ω₂)r
ω₁.ω₂.r

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Theory of Machine
What is the number of instantaneous centers for an eight link mechanism?

15
8
28
30

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