Caterpillar Inc Research Intern Interview Questions and Answers

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Q1. What is shear stress and bending moment
Ans. 
Shear stress is the force per unit area perpendicular to the material's cross-section, while bending moment is the internal moment that causes a beam to bend.
• Shear stress is calculated as force divided by area (τ = F/A)

• Bending moment is calculated as force multiplied by distance (M = F * d)

• Shear stress causes deformation parallel to the force applied, while bending moment causes deformation perpendicular to the force a...read more
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Q2. When is shear stress zero?
Ans. 
Shear stress is zero when there is no force applied parallel to the surface.
• Shear stress is zero in static fluids, where there is no movement or deformation.

• At the boundaries of a fluid at rest, shear stress is zero.

• In a material with no viscosity, shear stress is zero.

• Shear stress is zero at the center of a pipe with fluid flowing through it.

• In a solid material under pure normal stress, shear stress is zero.
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Q3. Why is shear stress zero when bending moment is maximum
Ans. 
Shear stress is zero when bending moment is maximum due to the distribution of forces in the cross-section of the beam.
• Shear stress is the force per unit area acting parallel to the cross-section of the beam.

• Bending moment is the internal moment that causes a beam to bend.

• When the bending moment is maximum, the forces are distributed in a way that results in zero shear stress at that point.

• This is because the shear str...read more
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