L&T Defence Production Manager Interview Questions, Process, and Tips

I joined as GET and aptitude test was seemed easy.

Q1. What is your favorite subject?
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Q2. What is critical speed?
Ans. 
Critical speed is the speed at which a rotating object experiences resonance and begins to vibrate uncontrollably.
• It is the speed at which the natural frequency of the object matches the frequency of its rotation.

• It can cause damage to the object and surrounding equipment.

• It is important to calculate critical speed in order to avoid resonance and vibration issues.

• Examples include turbine rotors, drive shafts, and centr
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Q3. How do u design a shaft?
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Designing a shaft involves determining its dimensions, material, and manufacturing process.
• Determine the required torque and power to be transmitted

• Select appropriate material based on strength, weight, and cost

• Calculate the shaft diameter and length based on the torque and bending stress

• Choose a manufacturing process such as forging, casting, or machining

• Consider factors such as surface finish, tolerances, and heat tr...read more
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Q4. Which one is better for good weight to strength ratio? Hollow or solid?
Ans. 
Hollow structures have a better weight to strength ratio than solid structures.
• Hollow structures are lighter than solid structures of the same material and size.

• Hollow structures distribute weight more evenly, reducing stress points.

• Hollow structures are often used in aerospace and automotive industries for their weight-saving properties.

• Solid structures may be stronger in certain applications, such as load-bearing col
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Q5. What is equation of Castigliano's theorem?
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Castigliano's theorem relates the partial derivative of the strain energy to the applied loads.
• Castigliano's theorem is used to determine the deflection of a structure under a given load.

• It is based on the principle of minimum potential energy.

• The theorem states that the partial derivative of the strain energy with respect to a force is equal to the displacement caused by that force.

• It can be used to solve for unknown ...read more
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Q1. Are you ready to relocate across India?
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