MDE 4 End of Unit Quiz

MDE 4 End Of Unit Quiz

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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

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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3. Possible Cause: Charge Air Cooler Issues

Question: Which issue related to the charge air cooler could cause a decrease in boost pressure?

B) An overfilled fuel tank

A) A damaged or clogged charge air cooler

C) A malfunctioning thermostat

D) A worn-out timing belt

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1. Purpose of Air Coolers After Turbochargers

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

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

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

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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Purpose of Vent Cocks in Air Coolers

Question: What is the purpose of vent cocks in air coolers?

A) To allow the release of trapped air or gases from the cooling system

B) To adjust the temperature of the air before it enters the engine

D) To monitor the coolant level in the air cooler

C) To increase the pressure of the air within the cooler

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2. Malfunctioning Turbocharger or Worn Turbine Blades

Question: What is a basic maintenance routine that could help with a malfunctioning turbocharger or worn turbine blades?

D) Change the engine's spark plugs

C) Adjust the engine's fuel mixture

B) Replace the turbocharger with a new unit

A) Check and clean the turbocharger air intake and exhaust areas

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1. Advantages of Pulse Systems

Question: What is one of the main advantages of using a pulse system in a turbocharged diesel engine?

A) It reduces the overall weight of the turbocharger

D) It simplifies the engine's fuel injection system

C) It eliminates the need for a separate intercooler

B) It enhances the efficiency of the turbocharger by improving turbine response and reducing turbo lag

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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?

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

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

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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

D) Piston rings and cylinder head

B) Fuel injector and exhaust manifold

A) Compressor wheel and turbine 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)

B) Vibration isolators

C) Engine support beams

E) Shock absorbers

D) Rubber or elastomeric pads

A) Mounting brackets

F) Fastening bolts

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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

D) Replace the engine oil and filter

B) Replace the turbocharger with a new unit

C) Clean the engine air filter

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5. Effect of Pulse System on Exhaust Temperature

Question: How does a pulse system typically affect the exhaust temperature in a turbocharged diesel engine?

A) It significantly lowers the exhaust temperature by reducing exhaust gas pressure

D) It drastically reduces exhaust temperature to prevent turbocharger overheating

B) It has no impact on the exhaust temperature

C) It may increase exhaust temperature by optimizing the utilization of exhaust gases

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Special Considerations for Engine Installation with Resilient/Flexible Mountings

Question: What is a special consideration necessary with respect to engine installation when using a resilient/flexible mounting for a diesel engine?

D) Properly securing the resilient/flexible mounts to prevent excessive movement and alignment issues

A) Ensuring the engine is perfectly aligned with the drive shaft

B) Regularly checking and adjusting the engine oil level

C) Ensuring adequate ventilation around the engine

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