Bennett Mechanical Test Fluid Mechanics and Hydraulics 2

Question 1

In a hydraulic system, a small piston with area 2 in² pushes against a large piston with area 10 in². If 50 lb is applied to the small piston, what force is produced at the large piston?

Accepted Answer

250 lb

Answer

Pressure is equal throughout, so force scales with area: (50/2) × 10 = 250 lb.

Question 2

Pascal's principle states that pressure applied to a confined fluid is transmitted:

Accepted Answer

Equally in all directions

Answer

Pascal's principle says confined fluid transmits applied pressure undiminished in every direction.

Question 3

Two connected pistons must conserve volume of fluid. If the small piston moves 10 inches and has area 2 in², how far does a 10 in² piston move?

Accepted Answer

2 inches

Answer

Volume is equal: 2 × 10 = 10 × d, so d = 2 inches.

Question 4

Which property allows hydraulic systems to multiply force?

Accepted Answer

Liquids are nearly incompressible

Answer

Because hydraulic fluid is nearly incompressible, applied pressure transmits directly into output force.

Question 5

A car lift uses a 1 in² input piston and a 100 in² output piston. To lift a 2,000 lb car, how much force is needed on the input?

Accepted Answer

20 lb

Answer

Force divides by the area ratio: 2,000 ÷ (100/1) = 20 lb.

Bennett Mechanical Test Practice Test

Bennett Mechanical Test Practice Test

Bennett Mechanical Test Fluid Mechanics and Hydraulics 2