🕒 Duration: 50 Minutes
🧠 Mode: Technical | Conceptual | Numerical
📐 Approach: Conceptual clarity, derivations, and diagram-based explanations
🔹 1. Warm-Up – General Discussion
The panel started with light, friendly conversation to ease into the interview.
✨ Tip: Always be ready for questions tied to your intro, background, or work experience, as these often set the tone for follow-up technical discussions.
🔸 2. Strength of Materials – Beam Bending Analysis
Problem Statement:
A simply supported beam of total length 3L, carrying a uniformly distributed load (UDL) over its entire span.
Questions Asked:
- a) Draw the Shear Force Diagram (SFD)
- b) Draw the Bending Moment Diagram (BMD)
- c) Calculate the deflection at midspan
Emphasis was placed on:
- Proper boundary condition application
- Sign conventions for SFD/BMD
- Correct scaling of diagrams
- Understanding of slope–deflection relationships
🔸 3. Heat Transfer – Transient Heating of Water
Scenario:
A 1 kg block of water initially at 0°C is heated using a 3 kW electric heater. Heating is continued for 150 seconds, after which it’s switched off.
Task:
- Plot and explain the Temperature vs. Time (T–t) graph for the full process.
Concepts Tested:
- Specific heat and energy balance
- Whether phase change (melting/boiling) occurs within 150 sec
- Post-heating behavior—natural cooling, heat losses
📘 Solved in Chayan Batch – Thermodynamics Lecture 04
🔸 4. Fluid Mechanics – Flow Reversal Paradox
Scenario:
Two tanks A and B are connected. Pressure at B > A, but no flow is observed.
Question:
Why is there no fluid flow from B to A, despite a higher pressure at B?
Concepts Explored:
- Elevation head
- Gravitational potential
- Hydrostatic balance
- Presence of flow resistance or siphoning threshold
📘 Solved in Chayan Batch – FM Lecture 10
🔸 5. Convective Heat Transfer – Temperature Profile
Question:
A cold fluid at 20°C flows through a long pipe with steady velocity V.
Task:
Plot the Temperature vs. Distance (T–x) graph along the pipe.
Discussion Focus:
- Convective heat transfer fundamentals
- Entry region vs. fully developed flow
- Axial temperature gradient
- Impact of thermal boundary layer growth
🔸 6. Heat Transfer Theory – Biot Number vs. Nusselt Number
Question:
- Define the Biot Number and Nusselt Number
- Explain their physical significance and differences
Key Concepts:
- Biot Number (Bi): Internal vs. surface resistance to heat flow
- Nusselt Number (Nu): Ratio of convective to conductive heat transfer
- Application in lumped capacitance and heat exchanger design
✅ Final Takeaways
📌 Master Core Areas:
- Strength of Materials (especially beam theory)
- Heat Transfer (conduction, convection, transient heating)
- Fluid Mechanics (flow scenarios and pressure head analysis)
📌 Draw to Explain:
Be ready to sketch and explain:
- SFD/BMD
- T–t and T–x plots
- Conceptual flow/thermal diagrams
📌 Interview Insight:
This wasn’t just a formula-based assessment. The panel focused on your engineering intuition, visualization skills, and how well you connect theory to real-world applications.