MDE 5 End of Unit Quiz

MDE 5 End Of Unit Quiz

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Question 2: Which defect in a fuel injector can cause fuel to leak into the combustion chamber continuously?

C) Leaking nozzle seals

D) Misaligned injector nozzle

B) Worn nozzle tip

A) Faulty solenoid

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Effects of Advanced Fuel Injection in Four-Stroke Engines

Question: What are the effects of advanced fuel injection in a four-stroke engine?

D) Decreased engine performance and increased fuel vaporization

C) Lower engine temperature and increased fuel consumption

B) Improved power output and reduced exhaust emissions

A) Increased engine knocking and reduced fuel efficiency

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Question 3: What defect can lead to erratic engine operation and knocking?

B) Overheating of the fuel pump

D) Damaged air filter

A) Incorrect spray pattern

C) Faulty engine thermostat

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Controlling Delivered Fuel Quantity in Bosch or Jerk Type Pumps

Question: In Bosch or Jerk type fuel injection pumps, how is the delivered quantity of fuel oil controlled?

C) By changing the position of the plunger within the pump cylinder

B) By varying the nozzle opening pressure

A) By adjusting the speed of the fuel pump

D) By regulating the temperature of the fuel oil

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Question 5: What is a possible defect in fuel injectors that may result in a rough engine idle and excessive exhaust smoke?

A) Damaged fuel pump

B) Leaking nozzle tip

D) Low oil pressure

C) Faulty ignition coil

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Purpose of the Delivery Valve in Bosch or Jerk Type Fuel Injection Pumps

Question: What is the purpose of the delivery valve in Bosch or Jerk type fuel injection pumps?

A) To regulate the fuel pressure before injection

D) To filter impurities from the fuel before it enters the pump

C) To control the timing of fuel injection

B) To prevent fuel leakage back into the pump after injection

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Understanding Atomization

Question: What is meant by atomization in the context of diesel engine fuel injection?

D) The process of filtering impurities from the fuel before injection

A) The process of cooling the fuel before it enters the combustion chamber

C) The process of increasing the temperature of the fuel to enhance combustion

B) The process of breaking down fuel into fine droplets for efficient mixing with air

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Question 4: Which defect in a fuel injector can cause reduced fuel efficiency and increased fuel consumption?

D) Worn valve guides

C) Faulty turbocharger

A) Blocked fuel filter

B) Poor injector atomization

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Effects of Retarded Fuel Injection in Four-Stroke Engines

Question: What are the effects of retarded fuel injection in a four-stroke engine?

A) Increased engine knocking and reduced power output

D) Lower engine temperature and smoother operation

B) Improved fuel atomization and reduced exhaust smoke

C) Enhanced acceleration and increased fuel efficiency

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Components of a Scroll Type Fuel Pump

Question: Which of the following labels the MAIN components of a scroll type fuel pump?

B) Plunger, needle valve, delivery valve, and fuel filter

D) Camshaft, high-pressure pipe, fuel tank, and throttle valve

A) Scroll mechanism, camshaft, delivery valve, and pump housing

C) Scroll mechanism, delivery valve, pressure relief valve, and injector nozzle

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Defects in Diesel Engine Fuel Nozzles

Question: What are some defects that diesel engine fuel nozzles may encounter during service? (Select THREE)

A) Clogged nozzle orifices

D) Corrosion or erosion of the nozzle tip

C) Excessive fuel pressure

F) Overheating of the fuel pump

B) Leaking nozzle seals

E) Incorrect spray pattern

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Fuel Metering in Scroll Type Fuel Pumps

Question: How does a scroll type fuel pump meter fuel for high and low loads?