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Polytechnic Interview Q&A — 24 branches, 480 interview questions. Click a branch to see its 20 Q&A. Mechanical Engineering 20 Q&A Q1. What is Mechanical Engineering? Mechanical Engineering is the branch that deals with the design, manufacturing, and maintenance of mechanical systems, covering areas like thermodynamics, machine design, manufacturing processes, and fluid mechanics. Q2. What is the difference between stress and strain? Stress is the internal resisting force per unit area developed inside a material when an external load is applied, while strain is the resulting deformation (change in length or shape) per unit original dimension caused by that stress. Q3. What is the difference between a two-stroke and four-stroke engine? A two-stroke engine completes a power cycle in one crankshaft revolution (two piston strokes), while a four-stroke engine takes two revolutions (four strokes: intake, compression, power, exhaust); four-stroke engines are more fuel effi...

ITI Interview – Mechanical/Manufacturing Trades — 15 trades, 300 interview questions. Click a trade to see its 20 Q&A. Fitter 20 Q&A Q1. What does a Fitter do? A Fitter assembles, fits, and repairs machine parts and mechanical components using hand tools and machine tools, ensuring parts fit together with correct alignment and tolerance. Q2. What is a try square used for? A try square checks whether two surfaces of a workpiece are exactly at 90 degrees to each other, and is also used to mark perpendicular lines. Q3. What is the difference between a file and a hacksaw? A file removes material by rubbing its toothed surface across a workpiece to smooth or shape it, while a hacksaw uses a thin, toothed blade to cut through metal. Q4. What is a vernier caliper used for? A vernier caliper measures internal, external, and depth dimensions of a workpiece with high precision, typically to an accuracy of 0.02mm. Q5. What is marking in fitting work? Marking is the process o...

EV Troubleshooting — real-world interview & field troubleshooting questions with clear, practical answers. Tap any question to open its answer. Showing the first 70 questions free. The complete question bank is available as a PDF below. EV Safety, High-Voltage Basics & Interlocks Q1 An EV will not power up after a repair. What should you check before touching the high-voltage system? Answer I will first follow the manufacturer's shutdown and high-voltage isolation procedure. I will verify the vehicle is in a safe state, disconnect the approved service disconnect where applicable, wait the specified discharge time, and confirm absence of hazardous voltage with the correct CAT-rated meter and PPE. I will never bypass interlocks or improvise a high-voltage isolation method. Q2 Why are orange cables used in EVs, and what does that mean during troubleshooting? Answer Orange cables normally identify high-voltage circuits. I treat any orange cable or component as potentially...