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Theory of Machine

Theory of Machine
The example of higher pair is

Ball and roller bearings
All of these
Gears, cams
Belt, rope and chain drives

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Theory of Machine
The factional torque for square thread at the mean radius r while raising load W is given by

T = W.r tan(φ - α)
T = W.r tan(φ + α)
T = W.r tanφ
T = W.r tanα

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Theory of Machine
The advantage of the piston valve over the slide valve is that in the former case

The pressure developed being high provides tight sealing
Wear is less
Power absorbed is less
Both wear and power absorbed are low

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Theory of Machine
According to Kennedy's theorem, if three bodies have plane motions, their instantaneous centers lie on A. A triangle

Two lines
A point
A triangle
A straight line

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Theory of Machine
The sensitiveness of the governor _____ as the speed range decreases.

Decreases
None of the listed here
Increases
Remains unaffected

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

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