AUT 102 Pre/Post test

Which of the following statements is true with respect to a rotary engine?

• The rotor is mounted in a cylindrical housing.

• There is no reciprocating motion.

• The engine produces one power pulse per rotor rotation.

• The engine produces more vibration when compared to other ICEs.

Technician A says that the Apex seals in a rotary engine act like piston rings. Technician B says that the rotor is mounted in a rectangular housing. Who is correct?

• Tech A

• Tech B

• Both Tech A and B

• Neither Tech A or B

With a(n) ________, instead of mixing the fuel/air in the intake manifold, it mixes in the combustion chamber.

• Oval combustion chamber

• Wedge combustion chamber

• Gas direct injection cylinder head

• Bathtub combustion chamber

The overhead cam engine system is more complicated than the OHV engine due to the need for enhanced oiling at the top of the engine for the ______.

• Camshaft

• Lifters

• Followers

• All of the above

_______ is a measure of the amount of pressure the valve spring is exerting to overcome the inertia of the valve train as the valve reaches its fully opened position.

• Valve spring closed pressure

• Valve spring open pressure

• Valve spring retainer pressure

• Valve float pressure

All the statements below are true EXCEPT:

• The timing of the valves is controlled by the physical shape and position of the cam lobes on the cam shaft.

• Racing engines are designed to minimize the effect of the column inertia encountered at higher rpm.

• Valve timing is critical to the proper operation of the ICE.

• On variable valve timing engines, the valve timing can be modified to provide the best operating conditions.

Tech A says that valve overlap occurs between the exhaust stroke and the intake stroke. Tech B says that valve overlap occurs to assist in scavenging the cylinder. Who is correct?

• Tech A

• Tech B

• Both Tech A and B

• Neither Tech A or B

Technician A says that when the lifter is on the base circle of the cam lobe, the valve is closed. Technician B says that the cam-in-block lifter rides directly against the valve. Who is correct?

• Tech A

• Tech B

• Both Tech A and B

• Neither Tech A or B

Which of the following is NOT a style of pushrod end?

• Ball to ball

• Cup to adjustable tip

• Ball to adjustable tip

• Ball to cup

When oil inside of an engine's valve cover penetrates the edge of the valve cover gasket material, it may be designed to swell by approximately ____.

• 10%

• 20%

• 30%

• 40%