MDE 5 Q1

1 / 6

Question: How does high fuel pressure affect the operation of a diesel engine fuel nozzle?

C) It lowers the fuel temperature before injection

A) It decreases the spray pattern's spread

B) It increases the spray pattern's spread and improves atomization

D) It reduces the overall fuel flow rate

2 / 6

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

C) Worn-out spark plugs

B) Excessive engine coolant pressure

D) Dirty air filter

A) Clogged nozzle orifices

3 / 6

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

D) Corrosion or erosion of the nozzle tip

A) Clogged nozzle orifices

C) Excessive fuel pressure

E) Incorrect spray pattern

F) Overheating of the fuel pump

B) Leaking nozzle seals

4 / 6

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

D) The injector body

B) The fuel pump

A) The nozzle tip

C) The fuel filter

5 / 6

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

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

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

6 / 6

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

D) To control the airflow into the engine

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

Your score is