MDE 5 End of Unit Quiz

MDE 5 End Of Unit Quiz

1 / 12

2. Purpose of Fuel Atomization

Question: Why is fuel atomization important in a diesel engine fuel nozzle?

B) To ensure the fuel mixes thoroughly with air for efficient combustion

C) To reduce the temperature of the fuel before injection

A) To increase the fuel's viscosity

D) To decrease the pressure of the fuel in the system

2 / 12

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

B) Worn nozzle tip

A) Faulty solenoid

C) Leaking nozzle seals

D) Misaligned injector nozzle

3 / 12

3. Fuel Nozzle Construction

Question: Which component of a diesel engine fuel nozzle is responsible for controlling the spray pattern of the fuel?

B) The fuel pump

A) The nozzle tip

C) The fuel filter

D) The injector body

4 / 12

1. Operation of a Diesel Engine Fuel Nozzle

Question: What is the primary function of a diesel engine fuel nozzle?

A) To regulate the engine speed

C) To cool the engine by circulating coolant

B) To inject fuel into the combustion chamber at high pressure

D) To control the airflow into the engine

5 / 12

Effects of Advanced Fuel Injection in Four-Stroke Engines

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

C) Lower engine temperature and increased fuel consumption

A) Increased engine knocking and reduced fuel efficiency

D) Decreased engine performance and increased fuel vaporization

B) Improved power output and reduced exhaust emissions

6 / 12

Main Components of a Fuel Injector Nozzle

Question: What are the MAIN components found in a cross section through the nozzle of a fuel injector? (Select THREE)

C) Needle valve

F) Injector body

E) Spring

A) Nozzle tip

B) Solenoid coil

D) Fuel filter

7 / 12

Defects in Main Engine Fuel Injectors

Question 1: What is a common defect in fuel injectors that results in poor engine performance and increased exhaust smoke?

C) Worn piston rings

A) Clogged nozzle orifices

B) Leaking fuel lines

D) Faulty glow plugs

8 / 12

5. Common Issues with Diesel Fuel Nozzles

Question: What is a common issue that can affect the performance of a diesel engine fuel nozzle?

D) Dirty air filter

C) Worn-out spark plugs

B) Excessive engine coolant pressure

A) Clogged nozzle orifices

9 / 12

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

B) Overheating of the fuel pump

A) Incorrect spray pattern

C) Faulty engine thermostat

D) Damaged air filter

10 / 12

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

D) Worn valve guides

B) Poor injector atomization

A) Blocked fuel filter

C) Faulty turbocharger

11 / 12

Fuel Metering in Scroll Type Fuel Pumps

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

A) By adjusting the speed of the scroll mechanism

C) By varying the displacement of the scroll mechanism

B) By changing the position of the camshaft

D) By altering the temperature of the fuel

12 / 12

Effects of Low Compression Pressure in Four-Stroke Engines

Question: What are the effects of low compression pressure in a four-stroke engine?

C) Enhanced throttle response and reduced exhaust emissions

B) Decreased engine temperature and improved fuel efficiency

D) Improved engine start-up and smoother operation

A) Increased fuel consumption and reduced power output

Your score is