Please answer all the above questions correctly.

12. Hydrocracking invariably takes place in a catalytic reformer unit - why? Is it desirable - why or why not? 13. FCC is both pressure and heat balanced - how? 14. What will happen if steam-air mixture is fed instead of air in a FCC regenerator? 15. What has to be done if heat generation in a hydrocracker reactor becomes uncontrollable? 16. There is no point in testing flash point of gasoline - comment. 17. What will happen if knock-out drum is not provided at the flare-stack bottom