Final answer:
The opposed-type engine has two banks of cylinders opposite each other with a crankshaft in the center. Air cooling is the predominant method used for this type of engine.
Step-by-step explanation:
The opposed-type engine has two banks of cylinders opposite each other with a crankshaft in the center. This type of engine can be either liquid cooled or air cooled, but air cooled is predominant. The cylinders are arranged in such a way that the pistons in each bank move in opposite directions. This configuration helps in balancing the engine and reducing vibrations.