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Aircraft systems and instrumentsQuestion 615 of 934

Why do many turbocharged engines have an intercooler?

  1. To cool the exhaust gases before the turbine
  2. To warm the oil in cold weather before takeoff
  3. To raise the induction air temperature for power
  4. To cool the compressed air and reduce detonation risk
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Correct answer: To cool the compressed air and reduce detonation risk

Compressing a gas raises its temperature. The intercooler uses outside air to cool the compressed air.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 7: Aircraft Systems — Superchargers and Turbosuperchargers — Turbosuperchargers, page 173

Practice aircraft systems and instruments

Questions last reviewed: 18 October 2026