Question

technician a says that engine output can be improved by increasing the amount of the air-fuel mixture that is burned in the cylinder. technician b says that increasing the amount of the air-fuel mixture reduces volumetric efficiency. who is correct?

a. technician a

b. technician b

c. both technician a and technician b

d. neither technician a nor technician b

Explanation:

To determine who is correct, we analyze each technician's statement:

• Technician A: Engine output is related to the energy released from burning fuel. Increasing the amount of air - fuel mixture burned in the cylinder (assuming proper combustion) means more fuel is burned, which releases more energy, thus improving engine output. This is consistent with the basic principle of how internal combustion engines work (more fuel - air mixture burned = more power, generally).
• Technician B: Volumetric efficiency is the ratio of the actual air - fuel mixture drawn into the cylinder to the theoretical maximum (cylinder volume). Increasing the amount of air - fuel mixture (e.g., through forced induction like turbocharging or supercharging) increases volumetric efficiency, as more mixture is being put into the cylinder than in a naturally aspirated, lower - mixture scenario. So Technician B's statement is incorrect.

Answer:

a. Technician A