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Theory of Machine

Theory of Machine
Rectilinear motion of piston is converted into rotary by

Connecting rod
Gudgeon pin
Cross head
Slider crank

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Theory of Machine
The values of velocity and acceleration of piston at near dead center for a slider-crank mechanism will be

0, 0
0, and less than coV
0, and more than co2r
cor, 0

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Theory of Machine
The maximum efficiency of spiral gears is (where θ = Shaft angle, and φ = Friction angle)

sin (θ + φ) + 1/ cos (θ - φ) + 1
cos (θ - φ) + 1/ cos (θ + φ) + 1
cos (θ - φ) + 1/ sin (θ + φ) + 1
cos (θ + φ) + 1/ cos (θ - φ) + 1

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Theory of Machine
The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing)

r tanφ
(r/2) cosφ
r cosφ
r sinφ

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Theory of Machine
The D-slide valve is also known as

Outside admission valve
Inside admission valve
None of these
Piston slide valve

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Theory of Machine
V-belts are usually used for

None of these
Long and short drives
Long drives
Short drives

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