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Theory of Machine

Theory of Machine
The minimum force required to slide a body of weight W on a rough horizontal plane is

W sinθ
W tanθ
W cosecθ
W cosθ

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

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

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Theory of Machine
A foot step bearing and rotor of a vertical turbine form examples of

Incompletely constrained motion
Completely constrained motion
Partially constrained motion
Successfully constrained motion

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Theory of Machine
In a shaper mechanism, the Coriolis component of acceleration will

Depend on position of crank
Exist
None of these
Not exist

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Theory of Machine
When the sleeve of a Porter governor moves upwards, the governor speed

Decreases
First increases and then decreases
Increases
Remain unaffected

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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/D₂
D₁
D₂/D₁

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