What is a lifting jack that uses hydraulic fluid power supplied from a manually operated hand lever?

• A. Bottle jack
• B. Scissor jack
• C. Hydraulic jack
• D. Pneumatic jack

Answer: (C)

A lifting jack that uses hydraulic fluid power supplied from a manually operated hand lever works by converting the manual pumping action into hydraulic pressure. The hand lever drives a small pump that pushes hydraulic fluid into a lifting cylinder. The fluid’s pressure moves the piston, raising the jack’s lifting ram and enabling heavy loads to be lifted with relatively little effort. This hydraulic pressure transmission, not air pressure, is what defines the device.

Pneumatic jacks rely on compressed air rather than hydraulic fluid, so they operate differently. Scissor jacks are typically mechanical screw-type lifts, though some hydraulic versions exist, but the defining feature described is the hydraulic system powered by a hand pump. Bottle jacks are a type of hydraulic jack, but the general category described is hydraulic jack.