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

A hot start is a known jet engine start malfunction characterized by the temperature of the engine rising beyond safe limits during the start-up phase. During the starting process, fuel is introduced into the combustion chamber, and when the engine fails to ignite properly or if there is an excessive amount of fuel added, this can lead to unburned fuel igniting and causing an increase in temperature.

The primary concern with a hot start is the potential damage to the engine. If the temperature exceeds specified thresholds, it can result in severe damage to engine components, including the turbine blades. Monitoring temperature during startup is crucial, and if a hot start is detected, actions such as shutting down the engine may be necessary to prevent damage.

Other options, while they may sound plausible, do not specifically denote recognized jet engine start malfunctions. A cold start refers to starting an engine at low temperatures, which does not typically indicate a malfunction. Quick start and delayed start can refer to engine starting processes but are not classified as malfunctions in the context of jet engines.