Question 171General Subjects - Assistant Engineer

The correct answer is B) The single-acting ram is not retracted by means of hydraulic force. In a single-acting hydraulic ram, hydraulic force is only used to extend the ram. The retraction of the ram is typically accomplished by means of a spring or gravity, not through the application of hydraulic force. This is the key distinguishing feature of a single-acting ram compared to a double-acting ram, where hydraulic force is used to both extend and retract the ram. The other answer choices are incorrect because A) and C) describe the operation of a double-acting ram, while D) describes the operation of a pulling cylinder, not a single-acting ram.