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Theory of Machine

Theory of Machine
For fluctuating loads, well suited bearing is

Thrust bearing
Needle roller bearing
Roller bearing
Ball bearing

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Theory of Machine
When a slider moves on a fixed link having curved surface, their instantaneous centre lies

At the centre of curvature
At the pin joint
On their point of contact
At the centre of circle

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Theory of Machine
In S.H.M., the velocity vector w.r.t. displacement vector

Lags by 90°
Leads by 90°
Are in phase
Leads by 180°

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Theory of Machine
The velocity of sliding of meshing gear teeth is(Where ω₁ and ω₂ are angular velocities of meshing gears and ‘y’ is distance between point of contact and the pitch point)

(ω₁/ω₂) y
(ω₁ + ω₂)/y
(ω₁ + ω₂) y
(ω₁ × ω₂) y

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Theory of Machine
In a flat collar pivot bearing, the moment due to friction is proportional to

(r₁³ - r₂³)/(r₁ - r₂)
(r₁² - r₂²)/(r₁ + r₂)
(r₁² - r₂²)/(r₁ - r₂)
(r₁³ - r₂³)/(r₁² - r₂²)

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Theory of Machine
An engine operates between temperatures of 900°Kandr2 and another engine between T2 and 400°K For both to do equal work, value of T2 will be

650°K
700°K
625°K
600°K

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