Exam Practice Questions And Correct

Ohio Hydraulics & Pneumatics Technician Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2025|2026 Q&A | Instant Download Pdf

• What is the primary purpose of a hydraulic system?

a) To store electrical energy

b) To transmit power using pressurized fluid

c) To measure fluid pressure

d) To reduce friction in mechanical systems

Rationale: Hydraulic systems use pressurized fluid to transmit power

efficiently.

• Which type of fluid is typically used in pneumatic systems?

a) Oil

b) Water

c) Compressed air

d) Hydraulic fluid

Rationale: Pneumatic systems operate using compressed air or gas

rather than liquid. 1 / 4

• In a hydraulic system, what does a pump do?

a) Measures flow rate

b) Converts mechanical energy into hydraulic energy

c) Stores fluid

d) Regulates temperature

Rationale: The pump pressurizes fluid to create hydraulic energy.

• What is the function of a hydraulic cylinder?

a) Filter hydraulic fluid

b) Measure pressure

c) Convert hydraulic energy into linear motion

d) Increase fluid temperature

Rationale: Cylinders take hydraulic pressure and convert it to

mechanical movement.

• Which component in a pneumatic system controls air flow direction?

a) Reservoir

b) Directional control valve

c) Actuator

d) Pressure gauge

Rationale: Directional control valves determine the path of airflow to

actuators.

6. Pascal’s Law states that:

a) Pressure decreases with depth

b) Fluid velocity is constant 2 / 4

c) Pressure applied to a confined fluid is transmitted equally in all

directions

d) Fluid flow is turbulent at high velocities

Rationale: Pascal’s Law is fundamental for hydraulic system

calculations.

• What is the typical unit of pressure in hydraulics?

a) Watts

b) Amperes

c) PSI (pounds per square inch)

d) Volts

Rationale: Hydraulic pressure is commonly measured in PSI.

• What is the main advantage of hydraulic systems over mechanical

systems?

a) Lower cost

b) Simpler design

c) High force and precise control

d) No maintenance required

Rationale: Hydraulics can provide high force with compact

components and precise control.

• Which type of hydraulic pump is constant displacement?

a) Vane pump

b) Gear pump

c) Variable displacement piston pump 3 / 4

d) Centrifugal pump

Rationale: Gear pumps deliver a fixed volume per revolution.

• What is the purpose of a hydraulic reservoir?

a) Measure fluid temperature

b) Increase system pressure

c) Store hydraulic fluid and allow air to escape

d) Convert hydraulic energy to mechanical energy

Rationale: The reservoir holds fluid, dissipates heat, and allows air to

escape.

• Which pneumatic actuator produces linear motion?

a) Rotary vane

b) Cylinder

c) Gear motor

d) Fan

Rationale: Pneumatic cylinders convert air pressure into linear

motion.

• What is a common method for controlling speed in a hydraulic

cylinder?

a) Using a directional valve only

b) Using a flow control valve

c) Increasing reservoir size

d) Changing pump type

• / 4