The three most common types of combustors used in gas turbine engines are which of the following?

Correct Answer: Option A — Can, Annular, and Can-Annular.

Gas turbine combustion systems are categorized by their physical arrangement. Can-type combustors are individual units, annular types use a single continuous ring, and can-annular designs combine individual cans within a common annular casing to balance airflow and structural integrity, ensuring efficient fuel-air mixing across the turbine inlet.