What is the primary purpose of a spring in a mechanical system?

To act as a flexible joint between two parts, absorbing or controlling energy due to shock and vibration.

Which of the following materials is unsuitable for use at subzero temperatures? A) Music wire B) Chrome-silicon C) Oil-tempered wire D) Stainless steel

A) Music wire

Riddle: I store energy and help control motion, but when I'm compressed or extended, I return to my original position. What am I?

A spring

True or False: Helical springs experience bending moments at all sections when under load.

False. Ideally, no bending moment would result at any section of the spring except for torsion and shear force.

The maximum shear stress in a helical spring occurs at which part of the spring?

The inner side of the spring.

Fill in the blank: The phenomenon where shear strain differs between the inside and outside surfaces of a spring due to its curvature is called ______.

Curvature effect

What is the formula to compute the deflection of a helical spring when a force is applied?

Δ = (64 × F × N) / (G × d³) where N is the number of active turns and G is the shear modulus of elasticity.

Which spring material is known for its high tensile strength and is commonly used for small springs?

Music wire

True or False: The design of springs subjected to variable loads does not require consideration of stress variation.

False. The design procedure should include the effect of stress variation in the spring wire.

What type of spring is primarily used in suspension systems of vehicles?

Leaf springs

Fill in the blank: The method used to design helical springs for variable loads is known as the modified ______ method.

Soderberg

Which of the following is a common type of compression spring? A) Tension spring B) Helical spring C) Extension spring D) Leaf spring

B) Helical spring

Riddle: I help prevent sideways sway in a long spring under compression. What failure am I associated with?

Buckling

What should the free length of a compression spring be, in relation to its coil diameter, to avoid buckling?

Less than 4 times the coil diameter.

True or False: The operational frequency of a spring should be equal to its fundamental frequency to avoid surge.

False. The operational frequency should be at least 15-20 times less than its fundamental frequency.

The weight of the spring is needed to calculate its what?

Fundamental frequency.

Fill in the blank: The two main types of helical springs are ______ and ______.

Compression springs and extension springs.

Which material is typically used for leaf springs due to its good mechanical properties?

Plain carbon steel or Chromium-vanadium steel.

What is the primary function of the master leaf in a laminated leaf spring?

To bear the primary load while distributing stress among the other leaves.

What is the effect of nipping in leaf spring design?

It helps to uniformly distribute stresses and reduce the overall stress on the master leaf.