A direct-drive oil pump uses gear to move the oil.

A direct-drive oil pump uses gear to move the oil.

• A. Gear
• B. Pump
• C. Valve
• D. Belt

Answer: (A)

The key idea is how the oil is moved inside the pump. A direct-drive oil pump that is driven straight from the engine uses a gear-type mechanism. In a gear pump, two gears rotate and trap oil in the spaces between their teeth and the housing. As they turn, those trapped pockets are carried from the suction side to the discharge side, delivering oil to the engine’s bearings and surfaces. This positive-displacement action means the flow is set by the gear size and engine speed, providing reliable lubrication across RPMs. That’s why identifying gear as the mechanism is the best answer: it directly describes how the oil is moved inside the pump. The other terms don’t specify the movement method: a pump is the general device, a valve controls flow rather than moving it, and a belt would be a drive method rather than the internal mechanism that moves the oil.

The key idea is how the oil is moved inside the pump. A direct-drive oil pump that is driven straight from the engine uses a gear-type mechanism. In a gear pump, two gears rotate and trap oil in the spaces between their teeth and the housing. As they turn, those trapped pockets are carried from the suction side to the discharge side, delivering oil to the engine’s bearings and surfaces. This positive-displacement action means the flow is set by the gear size and engine speed, providing reliable lubrication across RPMs. That’s why identifying gear as the mechanism is the best answer: it directly describes how the oil is moved inside the pump. The other terms don’t specify the movement method: a pump is the general device, a valve controls flow rather than moving it, and a belt would be a drive method rather than the internal mechanism that moves the oil.