Stout General Knowledge Practice Test

A dud is a propulsion failure that occurs after the round has left the launcher. For a Stinger Round, the flight motor should ignite after ejection and drive the missile toward its target. If the motor fails to operate once the round has been ejected, the round doesn’t perform as intended despite having left the launcher—that's the essence of a dud. A delay in function means the motor fires later than planned but still during flight, not a post‑ejection motor failure. A complete failure to fire describes an ignition failure from the start, i.e., a misfire. So the description that matches a dud is the flight motor failing after ejection.