MDE 4 End of Unit Quiz

MDE 4 End Of Unit Quiz

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Location of Thrust Bearing in Turbochargers

Question: Where is the thrust bearing typically fitted in a large medium-speed diesel engine turbocharger?

C) On the shaft between the compressor side and the bearing housing

A) Between the compressor wheel and the turbine wheel

D) At the intake manifold to reduce air pressure fluctuations

B) On the exhaust manifold to support the turbocharger housing

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Purpose of the Inducer in Turbochargers

Question: What is the primary purpose of the inducer in the construction of a diesel engine turbocharger?

D) To enhance the flow of lubricating oil to the turbocharger bearings

A) To direct the exhaust gases onto the turbine wheel for efficient energy extraction

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

B) To draw in and compress the intake air before it enters the compressor wheel

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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

B) They power the turbine, which drives the compressor

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

C) They cool the turbocharger to prevent overheating

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2. Impact of Air Cooler on Engine Performance

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

A) By reducing fuel consumption and increasing power output

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

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

D) By preventing the turbocharger from overheating during operation

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5. Maintenance of Air Coolers

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

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

C) Reducing the engine's operating temperature

A) Regularly replacing the turbocharger

D) Adding fuel additives to the diesel fuel

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3. Troubleshooting Pulse System Issues

Question: What could be a symptom of a problem with the pulse system in a turbocharged diesel engine?

C) Decreased engine oil temperature

B) Reduced engine responsiveness and increased turbo lag

A) Increased engine noise and vibration

D) Increased coolant temperature

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2. Possible Cause: Turbocharger Failure

Question: What could be a reason for a reduction in boost pressure over time in a turbocharged engine?

A) A malfunctioning turbocharger or worn turbine blades

D) A malfunctioning air conditioning system

C) An incorrect engine timing setting

B) A faulty ignition system

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Lubrication of Thrust Bearing in Turbochargers

Question: How is the thrust bearing typically lubricated in a large medium-speed diesel engine turbocharger?

A) By grease that is manually applied during maintenance intervals

D) By the engine’s lubricating oil system, which circulates oil through the turbocharger bearing housing

B) By engine coolant circulating through the bearing housing

C) By a dedicated oil pump that supplies pressurized lubricating oil directly to the bearing

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Purpose of Fins on Charge Air Cooler Tubes

Question: Why are fins attached to the tubes of a charge air cooler?

C) To reduce the weight of the charge air cooler

A) To increase the surface area for heat dissipation and enhance the cooling efficiency of the air

D) To provide a mounting point for additional components

B) To strengthen the structural integrity of the cooler tubes

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Purpose of the Diffuser in Turbochargers

Question: What is the primary purpose of the diffuser in the construction of a diesel engine turbocharger?

D) To filter out impurities from the intake air before it reaches the compressor

A) To increase the temperature of the compressed air before it enters the intake manifold

B) To reduce the pressure of the exhaust gases before they reach the turbine wheel

C) To slow down the high-velocity air exiting the compressor and convert kinetic energy into increased pressure

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4. Blocked or Restricted Intake Pipe or Manifold

Question: What is a simple maintenance task to address a blocked or restricted intake pipe or manifold?

A) Inspect and clean the intake pipe and manifold to remove any obstructions

C) Adjust the fuel injection timing

B) Replace the intake manifold with a new one

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2. Components of a Turbocharger

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

C) Crankshaft and camshaft

A) Compressor wheel and turbine wheel

D) Piston rings and cylinder head

B) Fuel injector and exhaust manifold

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