Subtopic: I.C. engine systems – fuel, cooling, lubrication, ignition, electrical, intake and exhaust
Question Statement:
Which of the following benefits are achieved by fitting an exhaust-gas-driven turbocharger with an intercooler to a tractor diesel engine?
Options:
(A) Increased charge air density entering the cylinders, enabling burning more fuel per cycle and raising brake power output by $20\text{--}40\%$
(B) Recovery of waste enthalpy from high-temperature exhaust gas to drive the compressor turbine
(C) Significant compensation for loss of engine power when operating at high altitudes with low ambient air density
(D) Elimination of the need for an engine cooling radiator
Answer Key:
A, B, C
Step-by-Step Solution & Explanation
- **A is correct:** Turbocharging compresses intake air, and the aftercooler (intercooler) cools it to raise volumetric density, increasing power density.
- **B is correct:** The turbine extracts kinetic and pressure energy from exhaust gas that would otherwise be rejected to the atmosphere.
- **C is correct:** Turbochargers spin faster in thin high-altitude air, automatically compensating for lower ambient air pressure.
- **D is incorrect:** Turbocharging INCREASES total heat rejection to coolant and oil, requiring a larger radiator, not eliminating it.