Exam 2: Introduction to Diesel Engines

Technician A says that most diesel engines used today have direct-injection combustion chambers. Technician B says that most diesel engines built today use multi-orifice spray nozzles. Who is correct?

Not only are diesel emissions as clean as gasoline engine mandated for 2017, but they also emit a minimum of _______ fewer exhaust emissions.

Which diesel engine combustion chamber design will produce the fastest coolant warm-up times?

What are the CO₂ emissions for a diesel engine?

Which one of the following negative characteristics did NOT hinder the more widespread use of diesels?

Which of the following best describes the term "ignition delay"?

Technician A says increasing an engine's compression ratio will produce better fuel economy but less power output. Technician B says increasing an engine's compression ratio produces more power but increases fuel consumption. Who is correct?

Which diesel engine combustion chamber design will produce the fastest coolant warm-up times?

Which of the following is NOT a major characteristic of the IDI chamber?

IDIs are capable of a faster top engine rpm limit due to a higher degree of _____ to produce more rapid and even mixing of air and fuel.

Technician A says a power stroke in a modern diesel engine uses only a single injection of fuel. Technician B says late-model diesel engines use multiple injection events during a combustion cycle. Who is correct?

Which one of the following conditions will be produced by prolonged ignition delay in a diesel engine?

Technician A says that a knocking sound in a diesel is normal and is caused by a sharp rise in cylinder pressure. Technician B says that a knocking sound in a diesel is caused by ignition delay of fuel. Who is correct?

Technician A says that without adequate turbulence, air and fuel will not mix, resulting in lost performance and efficiency and in increased emissions. Technician B says that the semi-toroidal shape of the DI chamber is designed to mix the air and fuel. Who is right?

Technician A says the evaporation of diesel fuel from the tank of a diesel bus on a warm day produces more emissions than a car. Technician B says that diesel fuel does not produce a significant amount of emissions due to fuel evaporation. Who is correct?

Inspiration for the engine concept may have occurred when Rudolf Diesel observed a demonstration of a device used to:

Which diesel engine combustion chamber design will produce the fastest coolant warm-up times?

Technician A says that high horsepower (kilowatts) is the most important attribute that an engine needs to pull heavy loads and accelerate quickly. Technician B says that high torque output is the most important attribute that an engine needs to quickly climb hills. Who is correct?

Technician A says that diesel engines can produce more power because air and fuel are not mixed during the intake stroke. Technician B says that diesel engines produce more power because they use excess air to burn fuel. Who is correct?

Technician A says that technological developments now enable the injection of gasoline directly into the combustion chamber of spark-ignited gasoline engines. Technician B says that gasoline direct-injection (GDI) engines inject gasoline near the beginning of the compression stroke. Who is right?