Which term describes the efficiency of filling the engine cylinders with air during the intake stroke?

Which term describes the efficiency of filling the engine cylinders with air during the intake stroke?

• A. Thermal Efficiency
• B. Volume Metric Efficiency
• C. Mechanical Efficiency
• D. Fuel Efficiency

Answer: (B)

During the intake stroke, the key is how effectively the cylinder is filled with air. The term that describes this filling efficiency is volumetric efficiency. It measures the actual amount of air that enters the cylinder compared to the theoretical maximum the cylinder could hold at a given displacement and conditions. Higher volumetric efficiency means more air—and thus more oxygen—for combustion, which typically leads to more power. The option that resembles this idea is Volume Metric Efficiency, which aligns with the concept of how much air actually fills the cylinder. The other terms refer to different aspects: thermal efficiency relates to converting heat into work, mechanical efficiency to losses from friction, and fuel efficiency to fuel usage per distance or power.

During the intake stroke, the key is how effectively the cylinder is filled with air. The term that describes this filling efficiency is volumetric efficiency. It measures the actual amount of air that enters the cylinder compared to the theoretical maximum the cylinder could hold at a given displacement and conditions. Higher volumetric efficiency means more air—and thus more oxygen—for combustion, which typically leads to more power. The option that resembles this idea is Volume Metric Efficiency, which aligns with the concept of how much air actually fills the cylinder. The other terms refer to different aspects: thermal efficiency relates to converting heat into work, mechanical efficiency to losses from friction, and fuel efficiency to fuel usage per distance or power.