433A Hydraulic Systems

Question 1

What is Pascal's Law as it applies to hydraulic systems?

Accepted Answer

Pressure applied to a confined fluid is transmitted equally in all directions throughout the fluid

Answer

Fluid flows from high pressure to low pressure

Answer

Hydraulic fluid cannot be compressed

Answer

The volume of fluid in equals the volume of fluid out

Question 2

What is the function of a hydraulic relief valve?

Accepted Answer

To protect the system from excessive pressure by diverting flow back to the reservoir

Answer

To regulate flow speed

Answer

To filter the hydraulic fluid

Answer

To control the direction of cylinder movement

Question 3

What happens if air enters a hydraulic system?

Accepted Answer

The system becomes spongy and erratic, with potential for cavitation and component damage

Answer

System efficiency increases

Answer

The fluid temperature drops

Answer

No effect on system performance

Question 4

What is the purpose of a hydraulic accumulator?

Accepted Answer

To store pressurized fluid to supplement pump flow, absorb shocks, or maintain pressure

Answer

To filter contaminants from the fluid

Answer

To cool the hydraulic fluid

Answer

To measure system pressure

Question 5

What does the ISO cleanliness code measure in hydraulic fluid?

Accepted Answer

The number and size distribution of solid contaminant particles per milliliter of fluid

Answer

The viscosity of the fluid

Answer

The water content of the fluid

Answer

The chemical composition of the fluid

Question 6

What is the function of a directional control valve in a hydraulic circuit?

Accepted Answer

To control the path of fluid flow to direct actuator movement

Answer

To limit maximum system pressure

Answer

To regulate fluid temperature

Answer

To measure flow rate