Inside the Interview Room: Essential CFD Engineer Questions at Tech Mahindra | Engineer’s Interview Blueprint

Landing a role as a CFD Engineer at Tech Mahindra is an exciting step toward a rewarding career in computational fluid dynamics and design engineering.  

However, candidates are often challenged with questions that assess their foundational engineering knowledge, design expertise, and understanding of modern automotive technologies like EVs and HEVs.  

This blog dives into the types of questions you might encounter, covering critical topics.  

Whether you’re a fresh graduate or an experienced engineer, these questions will help you prepare to stand out in your interview and showcase the essential skills expected of a CFD engineer. 

Interview Questions and Answers for a CFD Engineer Role at Tech Mahindra 

1. Petrol vs. Diesel Engines 

Answer: Petrol and diesel engines differ mainly in their combustion process and efficiency. Petrol engines use spark ignition, while diesel engines use compression ignition, which allows them to achieve higher compression ratios and efficiency. Diesel engines are generally more fuel-efficient and have a higher torque, while petrol engines are often smoother and quieter but consume more fuel per mile. 

2. 2WD vs. 4WD Difference 

Answer: In a 2WD (Two-Wheel Drive) vehicle, power is delivered to either the front or rear wheels only, which is common in lighter, more fuel-efficient vehicles. In contrast, 4WD (Four-Wheel Drive) vehicles distribute power to all four wheels, providing enhanced traction and control, especially on rough terrain. 4WD is ideal for off-road conditions or adverse weather but generally reduces fuel efficiency. 

3. EV and HEV Basics 

Answer: EVs (Electric Vehicles) run entirely on electric power stored in batteries, emitting zero tailpipe emissions and offering a quieter, cleaner drive. HEVs (Hybrid Electric Vehicles) combine an internal combustion engine with an electric motor, allowing the vehicle to run on either or both power sources. HEVs improve fuel efficiency and reduce emissions compared to traditional fuel-powered cars by switching between or combining power sources based on driving conditions. 

4. GD&T Basics 

Answer: Geometric Dimensioning and Tolerancing (GD&T) is a system for defining engineering tolerances. It uses symbols to describe the allowable variations in part geometry and is essential for ensuring that parts fit and function properly. GD&T includes concepts like form, orientation, location, and runout, which help maintain the precision required in engineering designs, especially in complex assemblies. 

5. Dimension Definition and Types 

Answer: Dimensioning refers to the measurements and specifications used to define the size, shape, and location of features on a part or assembly. Types of dimensions include linear, angular, and radial dimensions. Accurate dimensioning ensures that parts are manufactured to the required specifications and are compatible with mating parts in an assembly. 

6. Dimensioning Symbols Basics 

Answer: Dimensioning symbols are used in engineering drawings to convey important information about the size, location, and tolerance of features. Common symbols include diameter (Ø), radius (R), and various GD&T symbols like parallelism, perpendicularity, and flatness. These symbols help maintain clarity and consistency in interpreting design requirements. 

7. Center of Gravity 

Answer: The center of gravity (CG) is the point at which the weight of an object is evenly distributed in all directions. In automotive design, a lower CG can improve stability and handling, making it a critical factor in vehicle design and performance. Accurate placement of the CG is essential for ensuring vehicle safety and handling dynamics. 

8. Degree of Freedom (DOF) 

Answer: Degree of freedom refers to the number of independent movements allowed to a body. In mechanical design, a rigid body in 3D space has six degrees of freedom: three translational (movement along X, Y, Z axes) and three rotational (rotation around X, Y, Z axes). Understanding DOF is essential in design to predict and control how parts will move and interact within an assembly. 

Conclusion: 

Securing a position as a CFD Engineer requires a solid understanding of fundamental engineering principles, automotive technology, and design concepts.  

By preparing for questions like these, you’ll not only demonstrate your technical expertise but also showcase your ability to communicate complex ideas clearly—a skill highly valued at Tech Mahindra.  

Review these answers, relate them to your own experiences, and walk into your interview with confidence.  

Good luck, and may this preparation bring you one step closer to your desired role in CFD engineering! 

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