The two main types of "compressor" stalls are known as _________.

Correct Answer: Option C — steady state and transient

Compressor stalls are categorized by their onset. Steady-state stalls occur during constant speed operation due to airflow disturbances, while transient stalls result from rapid throttle movements or sudden changes in load. Both disrupt the pressure gradient across the compressor stages, potentially leading to flameout or significant mechanical stress on the blades.