Which device uses exhaust energy to compress the intake air in an engine?

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Prepare for the SEPTA Bus Mechanic Test with flashcards and multiple-choice questions, each offering hints and explanations. Master every aspect of the exam!

Multiple Choice

Which device uses exhaust energy to compress the intake air in an engine?

Explanation:
A turbocharger uses exhaust energy to compress the intake air by driving a turbine with exhaust gases, which in turn spins a compressor on the same shaft. This setup reclaims energy that would otherwise be wasted, increasing the density of the air entering the engine and allowing more fuel for more power without raising engine displacement. An intercooler, while helpful, is just a cool-down stage for the compressed air and does not perform compression. A supercharger also boosts air, but it’s powered by the engine itself (belt or gear driven), not from exhaust gases. A radiator is part of the cooling system for coolant and has no role in compressing intake air.

A turbocharger uses exhaust energy to compress the intake air by driving a turbine with exhaust gases, which in turn spins a compressor on the same shaft. This setup reclaims energy that would otherwise be wasted, increasing the density of the air entering the engine and allowing more fuel for more power without raising engine displacement. An intercooler, while helpful, is just a cool-down stage for the compressed air and does not perform compression. A supercharger also boosts air, but it’s powered by the engine itself (belt or gear driven), not from exhaust gases. A radiator is part of the cooling system for coolant and has no role in compressing intake air.

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