Which of the following is NOT a type of abnormal engine start?

A cold start refers to starting an engine at ambient temperatures and conditions without issues, and it typically does not indicate any malfunction or abnormality. In contrast, the other three terms—hot start, hung start, and no start—indicate specific problems that can occur during the engine starting process.

A hot start occurs when an engine temperature rises excessively, possibly due to a rich fuel-air mixture or insufficient cooling, which may lead to engine damage if not addressed. A hung start describes a situation where the engine fails to develop sufficient power after ignition, often because of fuel supply issues or mechanical problems. A no start situation indicates that the engine does not start at all, often due to electrical or fuel delivery issues.

By understanding these distinctions, it's clear that a cold start is a standard operation rather than an abnormal condition, which makes it the correct answer to the question of which option is NOT a type of abnormal engine start.