Mechanical Springs Quiz

What is the main function of a mechanical spring?

• To control the motion of cams and followers

• To apply forces in brakes and clutches

• To measure the forces in a spring balance

• To absorb the shock or vibration

Which material is commonly used to make springs?

• Titanium

• Copper

• Spring steel

• Aluminum

What type of spring can be stretched to increase its length?

• Constant force spring

• Torsion spring

• Extension spring

• Compression spring

What is the stress concentration factor due to curvature coil if the spring index is 4.5?

• 0.75

• 1.21

• 1.5

• 2.0

What is the wire diameter of a spring with a load of 50 lb, spring index of 8, and induced stress of 90 ksi?

• 0.135 in

• 0.145 in

• 0.125 in

• 0.116 in

If a load of 10kN is applied to a spring with a wire diameter of 25mm and 12 active coils, and it deflects by 75mm, what is the deflection of the spring? Take G = 80GN/m^2

• 100.5 mm

• 115.2 mm

• 125.8 mm

• 134.7 mm

A safety valve spring having 7.5 effective coil has the end squared and ground. The outside diameter of the coil is 115mm and the wire diameter is 13mm. It has length of 203 mm. Determine the length of wire to which this spring must initially compressed to hold the boiler pressure of 1.38MPa on a valve seat of 32 mm diameter. The modulus of elasticity of the spring wire is taken as 80 GPa

• 172 mm

• 150 mm

• 185 mm

• 162 mm

If a weight of 100lb strikes a coil from a height of 18 inches and deflects the spring by 6 inches, what is the maximum force applied on the spring?

• 600 lb

• 700 lb

• 800 lb

• 900 lb

The smaller of two concentric helical springs is made of 22 mm diameter steel spring has an outside diameter of 100mm with 10 active coils. The outside spring is made of a 32mm steel spring and has an outer diameter of 250 mm with 8 active coils, shear modulus of 80 GPa for both springs. Before the load is applied, the outer spring is 25mm longer than the inner spring. Determine the spring rate of the inner spring.

• 567.4 N/mm

• 493.8 N/mm

• 450.2 N/mm

• 520.6 N/mm

•How long a wire is needed to coil the spring having a mean coil diameter of 1 inch if there are 8 active coil

• 25.13 in

• 35.13 in

• 25.50 in

• 35.50 in