Exam 20: Fuel Injection Basics and Governor Principles

?Which of the following would represent the fastest engine rpm?

Which two factors define the droplet sizing emitted from a diesel fuel injector?

?If the signal from the accelerator pedal sensor is lost, which of the following is the likely outcome?

Which two truck engine manufacturers were known for favoring variable speed type governors on hydromechanical engines?

A truck has a governor classified a variable speed and the driver is moving the vehicle down a highway using 50% pedal travel. In order to maintain the same road speed to climb a hill, what should the driver do initially?

Where is the ideal location for peak cylinder pressure to occur on the power stroke?

A truck diesel engine rated speed governed at 2000 rpm has a droop curve of 10%. What should be the high idle speed?

If a truck diesel engine is said to be operating in isochronous mode, which of the following is it most likely doing?

A driver complains that when his truck engine is under load, whenever he removes his foot from the accelerator pedal, engine rpm drops below specified idle speed and occasionally stalls. Which of the following terms is used to describe this condition?

What replaces the governor functions of a hydromechanical engine on a current, electronically controlled engine?

Technician A says that diesel fuel droplets burn from the inside out. Technician B says that small fuel droplets heat up to their ignition temperature more rapidly than larger droplets. Who is correct?

If the main governor spring in a mechanical governor was worn out, what would be the likely performance symptom?

Technician A says recent CR fuel systems can produce injection pressures exceeding 2,450bar(35,000 psi). Technician B says that larger size fuel droplets are produced when fuel injection pressure are close to their maximum. Who is correct?

What is the term used to describe the graduated fuel deration (reduction in maximum fuel) that takes place between rated speed rpm and high idle rpm?

Which of the following is a common toggle option in the software of an electronically managed diesel engine?

In which of the following engine locations would ignition typically take place?

Technician A says that limiting speed (LS) governing is not an option in most electronically controlled engines. Technician B tells a truck driver that he can program his truck to operate in variable speed (VS) governing mode. Who is correct?

What type of governor is used in almost all current truck diesel engines?

What do most mechanical governors on truck engines use to sense engine speed?

How is an engine that is electronically managed, controlled?