Question 257Motor Plants - Assistant Engineer

The correct answer is B) Vertical opposed-piston. This type of marine engine has a fuel nozzle and combustion chamber located between two pistons in a common cylinder liner, which is a characteristic of the vertical opposed-piston engine design. In this configuration, the two pistons move in opposite directions within the same cylinder, with the fuel injection and combustion occurring in the space between them. The other options are incorrect because: A) Horizontal reciprocating engines do not have the fuel nozzle and combustion chamber located between two pistons, C) Single acting in-line cylinder engines have the fuel nozzle and combustion chamber at one end of the cylinder, and D) Double acting in-line cylinder engines have the fuel nozzle and combustion chamber at one end of the cylinder, not between two pistons.