South Carolina Hydraulic Systems
Technician Certification License Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. A hydraulic system’s primary purpose is to:
A. Convert thermal energy to light energy
B. Transmit force through an incompressible fluid
C. Store electrical energy for later use
D. Convert chemical energy into sound energy
Rationale: Hydraulic systems use an incompressible fluid to transmit
applied forces to perform work.
2. Pascal’s Law states that pressure applied to a confined fluid is:
A. Reduced toward the outlet
B. Inversely proportional to temperature
C. Transmitted equally in all directions
D. Lost through fluid friction
Rationale: Pascal’s Law describes pressure distribution in a confined
fluid being equal in all directions.
3. In a basic hydraulic circuit, the component that converts mechanical
energy into hydraulic energy is the:
A. Pump
, B. Actuator
C. Relief valve
D. Reservoir
Rationale: A pump supplies flow and pressure, converting mechanical
power into hydraulic energy.
4. The main function of a hydraulic reservoir is to:
A. Generate pressure
B. Act as a safety device
C. Store fluid and dissipate heat
D. Measure flow rate
Rationale: Reservoirs contain fluid, allow heat dissipation, and
provide gas separation.
5. Which fluid property most affects lubrication and heat transfer in a
hydraulic system?
A. Vapor pressure
B. Viscosity
C. Color
D. Specific gravity
Rationale: Viscosity directly influences lubrication and heat transfer
characteristics of fluid.
6. A relief valve in a hydraulic system is used to:
A. Control flow direction
B. Maintain constant flow
C. Prevent excessive pressure
D. Increase reservoir volume
Rationale: Relief valves protect the system from overpressure by
bypassing fluid when set pressure is reached.
7. A directional control valve that returns to center when actuated is
called:
, A. Manual latch valve
B. Spring-centered valve
C. Float-position valve
D. Check valve
Rationale: Spring-centered directional valves automatically return to
neutral when released.
8. What type of actuator converts hydraulic pressure into linear motion?
A. Hydraulic motor
B. Hydraulic cylinder
C. Check valve
D. Flow divider
Rationale: Hydraulic cylinders produce linear motion through fluid
pressure acting on a piston.
9. The symbol for a pump in schematic diagrams is typically a:
A. Square
B. Circle with arrow
C. Triangle
D. Diamond
Rationale: Hydraulic pump symbols use a circle with an arrow
indicating flow direction.
10. Cavitation in a hydraulic system is most often caused by:
A. Excess fluid temperature
B. Contaminated filters
C. Inlet restrictions causing low pressure
D. Overfilled reservoir
Rationale: Cavitation occurs when vapor bubbles form due to low
inlet pressure from restrictions.
11. A flow control valve is used to:
A. Increase fluid density
Technician Certification License Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. A hydraulic system’s primary purpose is to:
A. Convert thermal energy to light energy
B. Transmit force through an incompressible fluid
C. Store electrical energy for later use
D. Convert chemical energy into sound energy
Rationale: Hydraulic systems use an incompressible fluid to transmit
applied forces to perform work.
2. Pascal’s Law states that pressure applied to a confined fluid is:
A. Reduced toward the outlet
B. Inversely proportional to temperature
C. Transmitted equally in all directions
D. Lost through fluid friction
Rationale: Pascal’s Law describes pressure distribution in a confined
fluid being equal in all directions.
3. In a basic hydraulic circuit, the component that converts mechanical
energy into hydraulic energy is the:
A. Pump
, B. Actuator
C. Relief valve
D. Reservoir
Rationale: A pump supplies flow and pressure, converting mechanical
power into hydraulic energy.
4. The main function of a hydraulic reservoir is to:
A. Generate pressure
B. Act as a safety device
C. Store fluid and dissipate heat
D. Measure flow rate
Rationale: Reservoirs contain fluid, allow heat dissipation, and
provide gas separation.
5. Which fluid property most affects lubrication and heat transfer in a
hydraulic system?
A. Vapor pressure
B. Viscosity
C. Color
D. Specific gravity
Rationale: Viscosity directly influences lubrication and heat transfer
characteristics of fluid.
6. A relief valve in a hydraulic system is used to:
A. Control flow direction
B. Maintain constant flow
C. Prevent excessive pressure
D. Increase reservoir volume
Rationale: Relief valves protect the system from overpressure by
bypassing fluid when set pressure is reached.
7. A directional control valve that returns to center when actuated is
called:
, A. Manual latch valve
B. Spring-centered valve
C. Float-position valve
D. Check valve
Rationale: Spring-centered directional valves automatically return to
neutral when released.
8. What type of actuator converts hydraulic pressure into linear motion?
A. Hydraulic motor
B. Hydraulic cylinder
C. Check valve
D. Flow divider
Rationale: Hydraulic cylinders produce linear motion through fluid
pressure acting on a piston.
9. The symbol for a pump in schematic diagrams is typically a:
A. Square
B. Circle with arrow
C. Triangle
D. Diamond
Rationale: Hydraulic pump symbols use a circle with an arrow
indicating flow direction.
10. Cavitation in a hydraulic system is most often caused by:
A. Excess fluid temperature
B. Contaminated filters
C. Inlet restrictions causing low pressure
D. Overfilled reservoir
Rationale: Cavitation occurs when vapor bubbles form due to low
inlet pressure from restrictions.
11. A flow control valve is used to:
A. Increase fluid density
