Vehicle Technology and Emerging Trends
What this domain tests
This domain covers current vehicle technology: emission standards, engine management advances, electric and hybrid powertrains, alternative fuels and driver-assistance systems.
Core rules
- BS-VI in India limits particulate matter and NOx through diesel particulate filters, selective catalytic reduction with AdBlue, and precise common-rail injection.
- Common-rail diesel uses a high-pressure rail (often 1,500–2,000 bar) and electronically controlled injectors; variable-geometry turbocharging improves low-speed torque.
- A hybrid combines an engine and electric motor: series (engine drives a generator), parallel (both drive the wheels) or power-split.
- EVs use a high-voltage battery, inverter, motor and regenerative braking; the 12 V system is maintained through a DC-DC converter.
- ADAS levels run from 0 (no automation) to 5 (full automation); features include ABS, ESC, adaptive cruise, lane keeping and automatic emergency braking.
- Hydrogen fuel-cell vehicles generate electricity on board, emitting only water vapour.
Worked example
An EV has a 30 kWh battery and consumes 150 Wh per km. Range = 30,000 Wh ÷ 150 Wh/km = 200 km under ideal conditions. If only 90% of the pack is usable and a 10% reserve is kept, usable energy is 30 × 0.9 = 27 kWh and practical range is 27,000 ÷ 150 = 180 km. The reasoning is that range depends on both consumption and usable energy, not on the badge figure.
Traps that cost marks
Confusing kW (power) with kWh (energy), describing all hybrids as series, forgetting high-voltage PPE and isolation procedures, and assuming an EV battery charges at constant maximum rate.