Question

when air and fuel are burned in an engine, the process is called combustion. what type of combustion process is used in modern automobiles?
select one:
a. internal combustion
b. reserve combustion
c. external combustion
d. spontaneous combustion

Explanation:

Internal combustion engines are the most common type used in modern automobiles. In an internal combustion engine, the fuel - air mixture is burned inside the engine cylinders. Reserve combustion is not a standard term in this context. External combustion engines (like steam engines) have the combustion occur outside the power - producing part. Spontaneous combustion is an uncontrolled and unwanted ignition of materials without an external ignition source, which is not the normal operation in automobile engines.

Answer:

a. Internal combustion