Chapter 4 Test 1 - Compression System

Front

The compression ratio of most small engines ranges between ___.

Back

5:1 and 8.5:1

Front

During compression, heat is produced from the work applied by the ___?

Back

piston

Front

As the piston moves toward TDC, the volume of the combustion chamber is ___.

Back

reduced

Front

__________ is the molecular attraction by which atoms and molecules are united throughout the mass.

Back

Cohesion

Front

When gasoline is heated, it changes rapidly from a liquid to a(n) __________.

Back

vapor

Front

Gasoline molecules become less active as the temperature of the charge is raised. True or False?

Back

False

Front

Excessive compression can lead to detonation and preignition.

Back

True

Front

Detonation is sometimes called ___.

Back

knocking, spark knock, pinging

Front

___________ is an undesirable engine condition which occurs when a small portion of a combustion chamber component or a particle in the combustion chamber becomes excessively heated and ignites the charge as it enters the combustion chamber.

Back

Pre-ignition

Front

Compression ratio is decreased when a large volume of combustion chamber deposits accumulate in the engine.

Back

False