Which of the following is a known jet engine start malfunction?

A hot start is characterized as a malfunction during the start-up sequence of a jet engine, where the engine experiences an excessively high temperature during ignition. This condition often occurs when there is an insufficient airflow or fuel flow, leading to an increase in exhaust temperature. Hot starts can be dangerous because they may cause damage to the engine components, risking an engine failure. Pilots and maintenance crews are trained to recognize the indicators of a hot start and take appropriate measures to prevent or respond to this issue, such as shutting down the engine to avoid excessive damage.

In contrast, a cold start refers to the activation of an engine without encountering issues typically associated with high temperatures, while terms like quick start and delayed start do not specifically indicate known malfunctions associated with jet engines. Hence, hot start is the term that directly identifies a malfunction during the engine start process.