433A Hydraulic Systems 3

Question 1

What is the function of a check valve in a hydraulic system?

Accepted Answer

To allow flow in one direction only and block flow in the reverse direction

Answer

A check valve is a one-way valve that allows free flow in one direction and automatically closes to prevent flow in the opposite direction. It protects components and maintains pressure in specific parts of the circuit.

Question 2

What is the primary advantage of a piston-type hydraulic pump over a gear-type pump?

Accepted Answer

Higher pressure capability and better efficiency

Answer

Piston pumps can operate at significantly higher pressures (up to 6,000+ PSI) and maintain higher volumetric efficiency than gear pumps, making them suitable for demanding industrial and mobile hydraulic applications.

Question 3

In a hydraulic schematic, what does a diamond symbol typically represent?

Accepted Answer

A filter or conditioning component

Answer

In ISO hydraulic schematics, a diamond (rhombus) shape typically represents a fluid conditioning component such as a filter, strainer, heat exchanger, or separator.

Question 4

What causes hydraulic fluid to overheat?

Accepted Answer

Excess pressure drop across restrictions, internal leakage, relief valve bypass, or inadequate cooling

Answer

Hydraulic fluid overheats when energy is converted to heat faster than it can be dissipated. Common causes include relief valves constantly bypassing, excessive pressure drops across restrictions, internal component leakage, and insufficient cooler capacity.

Question 5

What is the function of a flow divider valve?

Accepted Answer

To split a single flow stream into two or more proportional flows regardless of varying load pressures

Answer

A flow divider valve splits a single pump flow into two or more equal or proportional output streams. It maintains the flow ratio even when downstream loads have different pressures, ensuring synchronized actuator movement.

Red Seal Millwright 433A Practice Test

Red Seal Millwright 433A Practice Test

433A Hydraulic Systems 3