Skid Steers Certification Practice Test

What describes a fixed displacement pump?

A pump that can vary the fluid volume in a pumping cycle A pump that uses air to operate A pump that is only used in mechanical systems A pump that cannot be adjusted to deliver more or less fluid volume in a pumping cycle

Correct Answer:

A pump that cannot be adjusted to deliver more or less fluid volume in a pumping cycle

Explanation:

A fixed displacement pump moves the same amount of fluid with every pumping cycle, so at a given shaft speed the output flow is essentially constant. The volume displaced per cycle is determined by the pump’s internal geometry and cannot be adjusted to deliver more or less fluid per cycle. If you need variable flow, you’d use a variable displacement pump, but a fixed displacement design keeps that per-cycle volume fixed and only changes overall flow by changing speed or throttling, not by changing the displacement itself. The other options describe pneumatic operation, a mischaracterization of its use, or variability that fixed displacement pumps do not provide.

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