Exam 32: Intake and Exhaust Systems

What is the best way to check whether a catalytic converter is working?

Technician A says the bearings in a turbocharger are cooled by engine oil. Technician B says turbocharger bearings are cooled by engine coolant. Who is correct?

Technician A says proper tuning of the exhaust manifold tubes can create a partial vacuum that helps draw exhaust gases out of the cylinder, improving volumetric efficiency. Technician B says combined headers allow the cylinders next to each other in the firing order to be combined. This increases exhaust efficiency. Who is correct?

Technician A tests for a restricted exhaust with an exhaust pressure gauge. Technician B uses a digital infrared pyrometer. Who is correct?

In a turbocharger, the turbine and compressor wheels rotate at speeds up to ______.

A restricted exhaust system can cause ______.

A catalytic converter is being tested with a pyrometer. The outlet temperature is 100 degrees Fahrenheit higher than the inlet temperature. What is indicated?

A pyrometer, an electronic device that measures heat, can be used to check the operation of a catalytic converter.

Technician A says a catalytic converter may be tested with a pyrometer. Technician B says a converter may tested using an exhaust gas analyzer. Who is correct?

A(n) ____________________ is an electronic device that measures temperature.

Variable intake manifolds for engines with port fuel injection are being discussed. Technician A says at low speeds, the air travels through a short or large diameter runner. Technician B says they deliver more power at high speed. Who is correct?

What are the two ways of artificially increasing the amount of airflow into the engine?

Technician A says engine vacuum is normally measured in inches of mercury (in. Hg). Technician B says a pressure gauge that is labeled psig will read 14.7 psi at sea level. Who is correct?

Superchargers are normally lubricated by engine oil through passages in the intake manifold.

What is the function of the exhaust flex joint?

The function of the catalytic converter on a diesel engine is to eliminate ______.

What is the first step in turbocharger inspection?

Tuned exhaust manifolds are primarily designed to reduce noise.

Acoustic supercharging uses the pressure of the air bouncing back and forth between the closed intake valve and incoming air from the plenum to increase the amount of air drawn into the cylinders.

Exhaust manifold gaskets are being discussed. Technician A says many modern vehicles are built without gaskets between the cylinder head and exhaust manifold. Technician B says when performing any service on theses engines that will require removing the manifold from the head, a new gasket should be installed.