Yes. Cyclones need sea temperatures of 26.5 degrees Celsius or higher to form.
The tropical Cyclone gets its energy from latent heat of condensation and the moisture generated from the sea, acts like fuel for the heat engine.
Yes, Cyclone Tracy was a tropical cyclone.
Yes, cyclone Mahina was a category 5 tropical cyclone and it hit north Queensland on the 4th of March 1899. It killed 307 people.
No