Hydraulic/Pneumatic Aptitude Test

Which of these is a single acting actuator?

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What is the use of the cushioning of a double-acting cylinder?

• It protects the cylinder against excessively high air pressure.

• It reduces the noise of the escaped air.

• It prevents a hard striking of the piston at the end positions.

• It holds the piston in position.

• It controls the speed motion of the cylinder during extension.

Which statement about a single-acting cylinder is correct?

• The retraction of the piston is usually achieved by a spring.

• The piston speeds in extension and retraction can be set.

• Both piston sides will alternately be pressurized with compressed air.

• Work can be conducted during extension and retraction of the piston.

• It has a larger air consumption than a double-acting cylinder.

A simplified displacement step diagram is shown below. Which of the following statements about the operation of the control system is correct?

• While cylinder 2A advances, cylinder C1 remains in the actuated position.

• Cylinder 2A advances after cylinder 1A has reached its retracted end position.

• Cylinder 2A extends. When the forward end position is reached, the piston rod returns automatically.

• The solenoid coil of 1V1 is energized as long as cylinder 1A advances and retracts.

• Cylinder 1A retracts as soon as valve 2V1 is actuated.

Which of these is a hydraulic pump unit?

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A pneumatic valve is defined as a “5/3-valve”. What do the numbers 5/3 mean in this definition?

• The valve has a port for the exhaust.

• The valve has 5 switching positions and 3 ports.

• The valve has a neutral position and 4 other switching positions.

• The valve has 5 ports and 3 switching positions.

• The valve has 5 ports for work conductions and a neutral position.

Using the circuit below, if valve 1V2 is clogged, what will happen?+

• The cylinder will extend and retract.

• The cylinder will extend but not retract.

• The cylinder will retract but not extend.

• The cylinder will neither retract nor extend.

• Cylinder 1A can be damaged.

Name this schematic symbol.

• Check valve

• Spring operated check valve

• Spring loaded, pilot operated check valve

• Shuttle valve

Which law states that fluid in a closed system takes the shape of the container that it occupies and exerts pressure in all directions?

• Blaise's law

• Boyle's law

• Gay-Lussac's law

• Pascal's law