MDE 4 Q2

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Question: How does an air cooler improve the performance of a diesel engine when fitted after a turbocharger?

B) By slowing down the engine's RPM and reducing wear

A) By reducing fuel consumption and increasing power output

D) By preventing the turbocharger from overheating during operation

C) By filtering out impurities from the intake air before it enters the engine

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Question: What is an important maintenance task for ensuring the efficient operation of air coolers in a turbocharged diesel engine?

D) Adding fuel additives to the diesel fuel

C) Reducing the engine's operating temperature

B) Cleaning the air cooler to remove any buildup of dirt or oil

A) Regularly replacing the turbocharger

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Question: What medium is commonly used to cool the air in an intercooler fitted after a turbocharger?

C) Ambient air

B) Engine coolant (water or antifreeze)

D) Fuel oil

A) Exhaust gases

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Question: Why are air coolers (intercoolers) typically fitted after the main engine turbochargers?

A) To increase the temperature of the intake air for better combustion

D) To eliminate moisture from the intake air and prevent engine corrosion

C) To reduce the engine's overall weight and improve its fuel efficiency

B) To decrease the temperature of the intake air, increasing its density and improving engine efficiency

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Question: What is a likely consequence if an air cooler fails or becomes inefficient on a turbocharged diesel engine?

A) Increased engine cooling efficiency

D) Improved fuel economy and lower engine emissions

C) Higher intake air temperature, leading to reduced engine efficiency and increased risk of knocking

B) Lower exhaust gas temperature and reduced power output

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