MDE 4 End of Unit Quiz

MDE 4 End Of Unit Quiz

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Indications of Poor Turbocharger Performance

Question: What are possible indications of poor turbocharger performance? (Select FOUR)

B) Excessive exhaust smoke or black smoke from the engine

F) Reduced power output and overall engine performance

E) Decreased engine coolant temperature

A) Increased turbo lag and delayed acceleration

C) Higher engine oil temperature than usual

D) Unusual whining or rattling noises from the turbocharger

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5. Possible Cause: Boost Control Issues

Question: What boost control issue could lead to a decrease in boost pressure in a turbocharged engine?

B) A failing battery

D) A clogged fuel filter

A) A faulty wastegate or boost control valve

C) A broken starter motor

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3. Cooling Medium for Air Coolers

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

B) Engine coolant (water or antifreeze)

A) Exhaust gases

D) Fuel oil

C) Ambient air

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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?

D) At the intake manifold to reduce air pressure fluctuations

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

B) On the exhaust manifold to support the turbocharger housing

A) Between the compressor wheel and the turbine wheel

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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?

C) Adjust the fuel injection timing

B) Replace the intake manifold with a new one

C) Adjust the fuel injection timing

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

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3. Damaged or Clogged Charge Air Cooler

Question: What is an economical maintenance routine to address a damaged or clogged charge air cooler?

D) Flush the engine cooling system

A) Inspect and clean the charge air cooler, and replace it if necessary

B) Replace the entire intake manifold

C) Adjust the engine timing

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5. Faulty Wastegate or Boost Control Valve

Question: What routine maintenance can be performed to address a faulty wastegate or boost control valve?

D) Change the engine coolant

A) Inspect and clean the wastegate and boost control valve, and check for proper operation

C) Adjust the engine's air-fuel ratio

B) Replace the wastegate or boost control valve with a new one

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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

A) Increased engine noise and vibration

D) Increased coolant temperature

B) Reduced engine responsiveness and increased turbo lag

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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

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

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

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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?

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

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

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

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

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Components of a Resilient/Flexible Engine Mounting

Question: In a cross section through a resilient/flexible mounting for a diesel engine, what are the MAIN components typically found? (Select THREE)

F) Fastening bolts

B) Vibration isolators

D) Rubber or elastomeric pads

A) Mounting brackets

E) Shock absorbers

C) Engine support beams

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1. Air Leak in Intake System or Charge Air Cooler

Question: What is a simple and economical maintenance routine to address an air leak in the intake system or charge air cooler?

A) Tighten all intake and charge air cooler clamps and inspect for visible damage

B) Replace the turbocharger with a new unit

D) Replace the engine oil and filter

C) Clean the engine air filter

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