Exam 4: Engine Basics

Technician A says that peak combustion pressures in modern diesel engines may be five times greater than the compression pressure in some modes of operation. Technician B says that while a diesel engine is idling, compression pressures may exceed combustion pressures. Who is correct?

What percentage of carbon is found in a typical highway diesel fuel?

A Navistar A26 engine has a total displacement of 12.4 liters. Convert this into cubic inches:

What is another way of saying manifold boost?

Which of the following correctly defines piston swept volume?

Which of the following does most to define the piston stroke dimension?

Which of the following compression ratios would be typical of a current, turbocharged highway truck diesel engine?

What is a typical compression ratio used on current spark-ignited, gasoline fueled engines with indirect injection?

What is the term used to describe the tendency of an object at rest to want to stay motionless?

If an engine is run for maximum mechanical efficiency, where should peak cylinder combustion pressure be achieved?

Which of the following defines actual piston stroke?

When does scavenging occur in the 4-stroke, diesel cycle?

What do you do to convert cubic inches into liters?

Which of the following acronyms is used to describe an engine piston that is at the exact bottom of its travel?

If an engine is described as square, which of the following would be true?