Exam 14: Air Induction and Crankcase Ventilation Systems

Adding ________ can supplement the oxygen in the intake air charge to supply a power boost if additional fuel is added and burned to use up the oxygen in the cylinder.

Two technicians are describing air intake system inspection. Technician A says that you visually inspect the air intake system to make sure it is intact. Technician B says that you inspect all ducts, pipes, hoses, tubing, and elbows used to interconnect the system. Who is right?

What is the primary use for a resonator box on the air inlet of a diesel engine?

Technician A says that a throttle plate on a late-model diesel engine helps increase the exhaust temperatures for the exhaust aftertreatment catalysts. Technician B says diesel air intake is not throttled. Who is correct?

Gases escaping past piston rings is called:

Technician A says that a crankcase depression regulator is used to prevent overpressurizing an engine's crankcase. Technician B says that the crankcase depression regulator prevents dirt from entering the engine through seals and gaskets. Who is correct?

Which of these results in higher pre-ignition temperatures that help ignite fuel faster for longer burn time and more complete combustion?

Technician A says that frequent air filter changes help maintain the cleanest quality of air that enters the engine. Technician B says that dirty filters are better than clean filters at allowing cleaner air to enter the engine. Who is correct?

Two technicians are discussing boosting power in a diesel engine. Technician A says that turbocharging the engine will increase horsepower. Technician B says that water-methanol systems are occasionally used by diesel performance enthusiasts to lower combustion chamber temperatures. Who is right?

Ethyl ether is highly flammable; it should never be sprayed into an engine that uses:

Technician A says that nitrous oxide (N2O) will disintegrate into oxygen and nitrogen components in a combustion chamber at 565°F. Technician B says that black or gray smoke under load can be caused by worn camshaft lobes. Who is right?

Which of the following instruments is the best to use to measure air inlet restrictions?

Which of the following practices is recommended for servicing a restricted air filter?

Which of the following methods can best detect a leaking air intake system?

Particulate matter (PM) emission found during idle conditions from some diesel engines can be as high as:

To obtain the most efficient filtration what should be avoided when servicing air filters?

MAF (mass airflow) sensors are used primarily on OBDII diesels to detect intake air problems as well as measure:

Dirt ingestion into an engine is referred to as:

To prevent engine damage while operating at near maximum threshold temperatures, water is added to the chamber to lower the combustion temperatures. What is this referred to as?

Two technicians are describing measuring an air filter restriction. Technician A says that you connect a Magnehelic gauge to the clean side of the air filter. Technician B says that you place the engine under load during a road test to operate the engine at maximum boost pressure. Who is right?