> What does the following do ?
> 
> (add-hook 'outline-minor-mode-hook 'tika-minor-mode nil t)
> 
> Does it enable tika-minor-mode when outline-minor-mode gets activated

It enables minor mode `tika-minor-mode' when minor mode `outline-minor-mode' is enabled AND when `outline-minor-mode' is disabled.

See `C-h f define-minor-mode':

 When called from Lisp, the mode command toggles the mode if the
 argument is `toggle', disables the mode if the argument is a
 non-positive integer, and enables the mode otherwise (including
 if the argument is omitted or nil or a positive integer).