MDE 4 Q1

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1. Basic Function of a Turbocharger

Question: What is the primary function of a turbocharger in a main engine?

C) To reduce the exhaust emissions by filtering out harmful gases

B) To increase the air intake pressure, allowing more air to enter the engine cylinders

A) To increase the fuel efficiency by injecting more fuel into the cylinders

D) To cool the engine by circulating coolant through the cylinder block

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5. Turbocharger Efficiency

Question: How can the efficiency of a turbocharger be improved?

D) By decreasing the engine's RPM

C) By reducing the size of the exhaust manifold

A) By increasing the fuel injection pressure

B) By optimizing the turbine and compressor design to reduce energy losses

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2. Components of a Turbocharger

Question: Which of the following components are essential parts of a turbocharger?

A) Compressor wheel and turbine wheel

B) Fuel injector and exhaust manifold

D) Piston rings and cylinder head

C) Crankshaft and camshaft

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4. Turbocharger and Exhaust Gases

Question: What role do exhaust gases play in the operation of a turbocharger?

A) They are recirculated into the intake manifold to reduce emissions

D) They are vented directly to the atmosphere without any impact on the turbocharger

B) They power the turbine, which drives the compressor

C) They cool the turbocharger to prevent overheating

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Turbocharger Cooling

Question: How is the turbocharger typically cooled in a marine diesel engine?

D) By routing exhaust gases through a separate cooling system

C) By injecting fuel into the turbocharger to absorb heat

B) By the circulation of lubricating oil through the turbocharger bearings and water jackets

A) By air flowing over the surface of the turbocharger housing

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Turbocharger Lubrication

Question: How is a turbocharger typically lubricated in a marine diesel engine?

B) By circulating engine lubricating oil through the turbocharger bearings under pressure

D) By mixing lubricating oil with the fuel before combustion

A) By injecting grease directly into the turbocharger bearings

C) By using a separate lubrication system dedicated to the turbocharger

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3. Impact on Engine Performance

Question: How does a turbocharger affect the performance of a diesel engine?

A) It reduces the engine's power output by restricting airflow

D) It slows down the engine's RPM by increasing the exhaust back pressure

B) It increases the engine's power output by compressing more air into the cylinders

C) It decreases the engine's fuel consumption by burning less fuel

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