Larsen & Toubro Limited Graduate Engineer Trainee(Get) Civil Interview Questions and Answers

Basic Aptitude Questions Reasoning & Verbal Ability

How is culture at IT Industries

Q1. What are the tensile forces acts on material
Ans. 
Tensile forces are forces that stretch or pull materials apart.
• Tensile forces act in the opposite direction of compressive forces

• Examples of tensile forces include stretching a rubber band or pulling on a rope

• Tensile strength is a measure of a material's ability to withstand tensile forces
Answered by AI
Add your answer
Q2. Write all formulas you know of Fluid Mechanics
Ans. 
Formulas in Fluid Mechanics
• Bernoulli's equation: P + 0.5ρv^2 + ρgh = constant

• Continuity equation: A1v1 = A2v2

• Navier-Stokes equation: ρ(∂v/∂t + v∇v) = -∇P + μ∇^2v + ρg

• Ideal gas law: PV = nRT

• Poiseuille's Law: Q = πr^4(ΔP)/(8ηL)
Answered by AI
Add your answer
Q3. Laws of thermodynamics
Ans. 
The fundamental laws of thermodynamics govern the behavior of energy in systems.
• First Law of Thermodynamics: Energy cannot be created or destroyed, only transferred or converted.

• Second Law of Thermodynamics: The entropy of an isolated system will always increase over time.

• Third Law of Thermodynamics: As temperature approaches absolute zero, the entropy of a system approaches a minimum value.

• Examples: A car engine conve...read more
Answered by AI
Add your answer
Q4. What is Fouriers Law write its equation
Ans. 
Fourier's Law describes the flow of heat through a material.
• Fourier's Law states that the rate of heat transfer through a material is directly proportional to the negative gradient of temperature and the area perpendicular to the direction of heat flow.

• The equation for Fourier's Law is q = -k * A * (dT/dx), where q is the heat transfer rate, k is the thermal conductivity of the material, A is the cross-sectional area, ...read more
Answered by AI
Add your answer
Q5. Explain Iron Carbon phase diagram
Ans. 
The Iron-Carbon phase diagram illustrates the phases and microstructures of iron-carbon alloys as a function of temperature and composition.
• Shows the phases of iron and carbon at different temperatures and compositions

• Includes regions for austenite, ferrite, cementite, and pearlite

• Critical points such as eutectic point and eutectoid point are marked

• Used to predict the microstructure of steel based on composition and he
Answered by AI
Add your answer
Q6. Stress Strain Curve Explain
Ans. 
The stress-strain curve shows the relationship between stress (force applied) and strain (resulting deformation) in a material.
• The curve typically consists of three main regions: elastic deformation, plastic deformation, and fracture.

• In the elastic region, the material deforms elastically and returns to its original shape when the stress is removed.

• The plastic region is where permanent deformation occurs, but the mater...read more
Answered by AI
Add your answer
Q7. Calculate SFD & BMD
Ans. 
SFD and BMD are calculated using equations of equilibrium and relationships between load, shear force, and bending moment.
• Calculate reactions at supports using equations of equilibrium

• Determine the shear force at different points along the beam by considering the applied loads and reactions

• Calculate the bending moment at different points by integrating the shear force diagram

• Plot the SFD and BMD based on the calculated...read more
Answered by AI
Add your answer
Q8. How to Calculate velocity of fluid flowing through pipe
Ans. 
Velocity of fluid flowing through a pipe can be calculated using the formula Q = A * V, where Q is the flow rate, A is the cross-sectional area of the pipe, and V is the velocity of the fluid.
• Calculate the cross-sectional area of the pipe using the formula A = π * r^2, where r is the radius of the pipe.

• Determine the flow rate (Q) of the fluid, which is typically measured in cubic meters per second (m^3/s) or liters per...read more
Answered by AI
Add your answer
Q9. What is Difference between entropy and enthalpy
Ans. 
Entropy is a measure of disorder or randomness in a system, while enthalpy is a measure of the heat energy in a system.
• Entropy is a thermodynamic property that measures the amount of energy in a system that is not available to do work.

• Enthalpy is a thermodynamic property that measures the total heat content of a system.

• Entropy increases in irreversible processes, while enthalpy remains constant.

• Entropy is denoted by S,...read more
Answered by AI
Add your answer
Q10. Draw Refrigeration Cycle Graph
Ans. 
The Refrigeration Cycle graph shows the process of cooling a space by transferring heat from inside to outside.
• The cycle starts with the refrigerant entering the compressor as a low-pressure gas.

• The refrigerant is compressed, raising its temperature and pressure, before entering the condenser where it releases heat to the surroundings.

• After losing heat, the refrigerant becomes a high-pressure liquid and flows into the ...read more
Answered by AI
Add your answer
Q11. Draw vapour absorption cycle graph
Ans. 
The vapor absorption cycle graph shows the relationship between pressure, temperature, and enthalpy during the process.
• The graph typically shows pressure on the y-axis and temperature on the x-axis.

• It includes lines representing the various stages of the cycle such as evaporation, absorption, and desorption.

• The enthalpy values at different points in the cycle can also be plotted on the graph.

• Example: The graph will sho...read more
Answered by AI
Add your answer
Q12. Draw Rankine otto & diesel cycle graph
Ans. 
The Rankine, Otto, and Diesel cycle graphs are commonly used in thermodynamics to analyze different types of heat engines.
• The Rankine cycle is used in steam power plants and consists of four processes: heat addition, isentropic expansion, heat rejection, and isentropic compression.

• The Otto cycle is used in spark-ignition engines and consists of four processes: isentropic compression, constant volume heat addition, isen...read more
Answered by AI
Add your answer

Simple aptitude questions

This is a shortlisting round, and many technically knowledgeable individuals did not qualify for this stage.

Q1. Which flow system is more effective: countercurrent flow or concurrent flow, and what are the reasons for this?
Ans. 
Countercurrent flow is more effective due to increased concentration gradient and better utilization of resources.
• Countercurrent flow allows for a greater concentration gradient between the two fluids, leading to more efficient mass transfer.

• Countercurrent flow also allows for better utilization of resources as the fluids are in contact for a longer period of time.

• Concurrent flow, on the other hand, results in a lower ...read more
Answered by AI
Add your answer
Q2. What is the procedure for designing a heat exchanger?
Ans. 
The procedure for designing a heat exchanger involves determining heat transfer requirements, selecting appropriate materials, designing the geometry, and analyzing performance.
• Determine the heat transfer requirements based on the fluids involved, flow rates, temperatures, and desired heat transfer rate.

• Select appropriate materials for the heat exchanger based on compatibility with the fluids, operating conditions, and...read more
Answered by AI
Add your answer