Question

technician a says that spark ignition engines use the heat of compression to ignite the air - fuel mixture. technician b says that compression ignition engines use spark plugs to ignite the air - fuel mixture. who is correct?

a. technician a

b. technician b

c. both technician a and technician b

d. neither technician a nor technician b

Explanation:

• Spark ignition engines (like gasoline engines) use spark plugs to ignite the air - fuel mixture, not the heat of compression. So Technician A is wrong.
• Compression ignition engines (like diesel engines) use the heat of compression to ignite the air - fuel mixture, not spark plugs. So Technician B is wrong.

Answer:

d. Neither Technician A nor Technician B