Machine Design
Which is correct statement?

Both will be equally rigid
Which one is rigid will depend on several other factors
A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel
A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron

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Machine Design
The face of the tooth is the

Surface of the top of the tooth
Surface of the tooth above the pitch surface
Width of the tooth measured along the pitch circle
Surface of the tooth below the pitch surface

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