FREE Millwright Hydraulic Systems and Schematics Questions and Answers

Question 1

In a hydraulic schematic, what is the function of a symbol showing a rectangle with a spring line and an arrow drawn diagonally through it?

Accepted Answer

A variable pressure relief valve

Answer

A fixed displacement pump

Answer

A check valve

Answer

A flow control valve

Question 2

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

Accepted Answer

To store hydraulic energy and absorb shocks

Answer

To filter contaminants from the fluid

Answer

To cool the hydraulic fluid

Answer

To convert hydraulic energy to mechanical motion

Question 3

A loud whining or screeching noise from a hydraulic pump is often a symptom of what condition?

Accepted Answer

Pump cavitation

Answer

Excessive system pressure

Answer

Fluid viscosity being too high

Answer

Normal pump operation

Question 4

According to Pascal's Law, if a 100 lb force is applied to a 1-square-inch piston, what is the maximum weight that can be lifted by a 10-square-inch piston in the same system?

Accepted Answer

1,000 lbs

Answer

100 lbs

Answer

10 lbs

Answer

10,000 lbs

Question 5

What does the designation '4/3' for a directional control valve indicate?

Accepted Answer

4 ports and 3 positions

Answer

4 positions and 3 ports

Answer

A maximum pressure of 400 PSI and 3 gallons per minute flow

Answer

A 4-inch port size with 3 internal spools

Question 6

Besides lubrication, what is the most critical function of hydraulic fluid in a system?

Accepted Answer

To transmit power

Answer

To prevent corrosion

Answer

To clean the system components

Answer

To provide electrical insulation