FAA Commercial Pilot Airplane (CAX)Aircraft SystemsMedium
A turbocharged airplane's induction system includes a heat exchanger positioned between the turbocharger compressor discharge and the intake manifold. What is the primary purpose of this component?
- ACool the compressed induction air to increase its density and reduce detonation tendency
- BFilter particulates from the turbine exhaust before it reaches the wastegate
- CIncrease induction air temperature to improve fuel vaporization
- DRegulate propeller blade angle in response to manifold pressure changes
Show answer & explanationAnswer & explanation
Correct answer: A. Cool the compressed induction air to increase its density and reduce detonation tendency
Compressing air with a turbocharger raises its temperature, which reduces density and increases detonation risk. An intercooler removes this heat before the air enters the cylinders, restoring density and improving the engine's detonation margin.
Why the other options are wrong
- B. Intercoolers act on induction air, not turbine exhaust filtration.
- C. Warmer air would reduce density, which is counterproductive at high power.
- D. Propeller blade angle control is unrelated to the induction heat exchanger.
Intercooler
A heat exchanger that cools compressed induction air from the turbocharger before it reaches the cylinders, increasing density and reducing detonation risk.
- Located between compressor discharge and intake manifold
- Increases air density for more power/less detonation risk
- Common on turbocharged high-performance engines
Memory trick: Hot squeezed air needs a cool-down before the burn.