Millwright Certification Hydraulic Systems and Schematics 2

Question 1

What is the primary function of an accumulator in a hydraulic system?

Accepted Answer

To store pressurized fluid for peak demand and absorb pressure spikes

Answer

To filter contaminants from the fluid

Answer

To regulate fluid temperature

Answer

To convert hydraulic energy to electrical energy

Question 2

A hydraulic cylinder extends slowly but retracts at normal speed. What is the most likely cause?

Accepted Answer

The piston seal is leaking, allowing fluid to bypass

Answer

The pump is cavitating

Answer

The tank is overfilled

Answer

The pressure relief valve is set too high

Question 3

What does a diamond shape with a diagonal line through it represent on a hydraulic schematic?

Accepted Answer

A heat exchanger

Answer

A fixed displacement pump

Answer

A filter or strainer

Answer

A flow control valve

Question 4

Why is it important to check for air in a hydraulic system after maintenance?

Accepted Answer

Air is compressible and causes spongy operation, heat, and accelerated fluid degradation

Answer

Air improves system efficiency

Answer

Air acts as a lubricant for pump components

Answer

Air prevents cavitation in the pump

Question 5

What is the purpose of a counterbalance valve in a hydraulic circuit?

Accepted Answer

To prevent uncontrolled movement of a load that could overrun the pump flow

Answer

To balance flow between two actuators

Answer

To equalize pressure across the system

Answer

To count the number of cylinder cycles

Question 6

What does a hydraulic system pressure gauge reading that fluctuates rapidly indicate?

Accepted Answer

Air in the system or a failing pump

Answer

Normal system operation

Answer

The gauge needs calibration

Answer

The relief valve is working correctly