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Theory of Machine

Theory of Machine
Cam size depends upon

Pitch circle
Prime circle
Outer circle
Base circle

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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.

None of the listed here
Less
Same
More

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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 anticlockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

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

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Theory of Machine
In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)

P = W tan(φ - α)
P = W cos(α + φ)
P = W tan(α + φ)
P = W tan(α - φ)

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Theory of Machine
In multi V-belt transmission, if one of the belt is broken, we have to change the

Broken belt and its adjacent belts
There is no need of changing any one as remaining belts can take care of transmission of load
All the belts
Broken belt

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Theory of Machine
If ‘D₁’ and ‘D₂’ be the diameters of driver and driven pulleys, then belt speed is proportional to

D₁/D₂
D₁
D₁.D₂
D₂/D₁

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