Engineering · Diesel — Air Systems
The air cooler (intercooler/aftercooler) downstream of a turbocharger is fitted to:
- ACool the exhaust before the stack
- BIncrease the density of the charge air so more air mass enters the cylinder✓ Correct
- CWarm the scavenge air for cold starting
- DLubricate the turbocharger bearings
Explanation
Compressing air heats it and lowers its density. Cooling the charge air after the turbocharger increases its density so a greater mass of air — and thus more fuel/power — fits each cylinder.
Authority: Diesel Engines (USCG engineering topic)
Practice the full Engineering bank
Free spaced-repetition quizzing across 2190 USCG exam questions — it schedules your reviews so the ones you miss come back until they stick.
Related Engineering questions
- Diesel — Air Systems
The primary purpose of scavenging in a two-stroke diesel engine is to:
- Diesel — Air Systems
A turbocharger increases engine power output mainly by:
- Diesel — Air Systems
'Blowby' in a diesel engine refers to:
- Diesel — Air Systems
A turbocharger on a diesel engine is driven by:
- Diesel — Air Systems
Surging of a turbocharger is best described as:
- Diesel — Operating Cycle
In a four-stroke-cycle diesel engine, the events occur in which order?