Machine Design
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

8W/9
W/2
W/9
2W/3

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Machine Design
Which is correct statement?

A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron
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

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