What is Auto-ignition temperature?
(a) maximum temperature to which oil is heated in order to give off inflammable vapour in sufficient quantity to ignite momentarily when bought in contact with a flame
(b) that at which it catches fire without external aid
(c) indicated by 90% distillation temperature
(d) none of the mentioned
The question was posed to me during an online exam.
My question is based upon Qualities of Fuel topic in section Conventional and Alternate Fuels of IC Engine