helical spring- open coil

What is an open-coil helical spring?

• A spring with an increasing pitch
• A spring with a decreasing pitch
• A spring with a uniform pitch
• A spring with a variable pitch

Which of the following is not a use of open-coil helical springs?

• Valve springs
• Suspension springs
• Torsion springs
• Toy springs

What is the formula for the stress produced by a helical spring under axial load?

• σ = Mc/I
• σ = Mb/I
• σ = F/A
• σ = Fd/4d^3

What is the name of the process used to manufacture helical springs?

• Extrusion
• Stamping
• Forging
• Coiling

Which of the following is not a material commonly used in the manufacture of open-coil helical springs?

• High-carbon steel
• Stainless steel
• Copper
• Titanium