Hydraulic Systems Quiz

What are the two conditions required to perform hydraulic work according to the article?

• Temperature and pressure

• Flow and temperature

• Flow and pressure

• Pressure and volume

In an open center hydraulic system, how are flow and pressure characterized?

• Flow is intermittent and pressure is continuous.

• Flow is continuous and pressure is intermittent.

• Both flow and pressure are continuous.

• Both flow and pressure are intermittent.

What is the main difference between an open center and a closed center hydraulic system?

• The type of hydraulic fluid used

• The construction of the directional control valve

• The size of the hydraulic pump

• The type of actuators used

What happens in an open center system when one of the directional control valve’s spools is stroked?

• The pump stops generating flow.

• The flow is blocked completely.

• The flow is focused toward a load and pressure is created.

• The hydraulic work is executed without moving the load.

In a closed center system, what triggers the pump to produce the flow needed for hydraulic work?

• The pump turns at a constant rate regardless of conditions.

• A pressure signal is sent from the directional control valve to the pump.

• The spool is stroked and the flow is automatically generated.

• The hydraulic work is executed without any signal.

How does an open center system differ from a closed center system in terms of oil flow when work sections are not being used?

• An open center system stops the flow of oil completely.

• A closed center system continues to send oil through the valve.

• An open center system continuously sends oil through the valve.

• Both systems stop the flow of oil completely.

Which type of center system is traditionally less expensive and why?

• Closed center system, because it uses a fixed displacement pump.

• Open center system, because it uses a variable displacement pump.

• Open center system, because it uses a fixed displacement pump.

• Closed center system, because it uses a variable displacement pump.

What is a benefit of using a closed center system over an open center system?

• It requires more energy and fuel.

• It is less efficient but more expensive.

• It is usually more efficient as it does not continuously send oil through the valve when not in use.

• It produces a large displacement of oil at all times.

What is typically used in conjunction with electrically operated work sections to allow the valve and pump to communicate when flow is not needed in an open center system?

• A) A full-flow dump valve or something similar

• B) A fixed displacement pump

• C) A closed center directional control valve

• D) An internal passage adjustment

What is required when converting an open center directional control valve to a closed center directional control valve?

• A) Additional items to allow the pump to dump excess flow

• B) A full-flow dump valve

• C) An electric dump valve

• D) An adjustment to the system's efficiency