The answer to the above poll is


2 Decreases- Pressure generally is applied by fluids, solids cannot apply pressure they induce stress always.
So, by using continuity equation and Bernoulis equation we will get that Area increases pressure increases which happens in Diffuser and vise versa in Nozzle.

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In lewis beam strength there is an assuption that the beam is of uniform strength.
This assumption is bit practical as we can make a beam of equal strenght either by varying its width linearly or by varying its depth parabollicaly.
Gear tooths when seen as a Cantilever joint we can observe that depth increases as we move from free end towards the fixed end of the tooth.

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For wear strength we always make safe Pinion because more contact is of pinion rather than gear becuase pinion is of smaller size.
In checking beam strength we check by product of bending stress and tooth factor.
But to find wear strength we just directly design for pinion.


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