Examkin

Soru

Zorluk: OrtaEngine Principles and Internal Components

Inside an engine cylinder, both the intake and exhaust valves remain sealed shut while the piston travels upward from bottom dead center (BDC) toward top dead center (TDC). Which stroke of the operating cycle is taking place?

  1. A
    Exhaust stroke
  2. Compression strokeCevap
  3. C
    Power stroke
  4. D
    Intake stroke

Cevap

Compression stroke
During the compression stroke, the piston travels upward from bottom dead center (BDC) to top dead center (TDC) to compress the air-fuel mixture into the combustion chamber, which requires both the intake and exhaust valves to remain completely closed.

Adım Adım Çözüm

1
Analyze the valve operating states
Both the intake and exhaust valves are fully closed.
Both valves are closed only during two phases of the four-stroke cycle: the compression stroke and the power stroke.
2
Evaluate the direction of piston travel
The piston travels upward from BDC toward TDC.
Upward piston motion reduces the volume of the combustion chamber, compressing the trapped charge.
3
Combine physical conditions to identify the stroke
The cycle phase is the compression stroke.
The power stroke involves downward piston travel, making the compression stroke the only phase matching upward motion with both valves closed.

Anahtar Kavram

Four-stroke internal combustion engine cycle phases and valve operating states
Tahmini Süre:45s
Bu soruyu puanla

Konular

Engine Principles and Internal Components

Bu konudan daha fazla soru