# Control Systems Questions and Answers – Hydraulic Systems

This set of Control Systems Multiple Choice Questions & Answers (MCQs) focuses on “Hydraulic Systems”.

1. Heavy lifting work is often accomplished by shifting fluids in big machines. The power system of such machines can be described as
a) Reciprocating
b) Pneumatic
c) Hydraulic
d) Hybrid

Explanation: The power system of heavy and big machines can be described by hydraulic systems and heavy lifting work is often accomplished by shifting fluids in big machines.

2. The scientific principle that makes hydraulic systems possible is
a) Pascal’s principle
b) Boyle’s law
c) Bernoulli’s principle
d) The fluid flow principle

Explanation: Pascal’s law says that pressure applied to an enclosed fluid will be transmitted without a change in magnitude to every point of the fluid and to the walls of the container. The pressure at any point in the fluid is equal in all directions.

3. Pneumatic and other power systems can support three kinds of motion; they are
a) Linear, reciprocating, and random motion
b) Linear, flowing, and rotary motion
c) Linear, zigzag, and spiral motion
d) Linear, reciprocating, and rotary motion

Explanation: Pneumatic systems are the systems that control the process where the motion is in air and can support linear, reciprocating, and rotary motion.

4. A single acting cylinder can be pressurized externally from one direction only.
a) True
b) False

Explanation: Pressure variation is possible only if the force is acting from one direction if the force will be acting from multiple directions then the force cancellation is also possible.

5. A one-way valve that lets air into the reservoir of a compressor, but doesn’t let it out, is a
a) Check valve
c) Control valve
d) Three way valve

Explanation: Check valve is a one-way valve that lets air into the reservoir of a compressor, but doesn’t let it out as the name indicates it allows air to enter as it has one entrance.
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6. Series circuits work on both hydraulic and pneumatic actuators.
a) True
b) False

Explanation: Series circuits are the circuits where the components are connected in series and the component is called lumped component and work for both hydraulic and pneumatic error detectors.

7. 5/2 way single solenoid valve has:
a) 2 ports 2 positions
b) 5 ports 2 positions
c) 5 ports 5 positions
d) 2 ports 5 positions

Explanation:5/2 way single solenoid valve is the valve in which the valve is in the shape of solenoid has 5 ports equally spaced and 2 flow positions.

8. The ____________________ converts the compressed air energy into mechanical energy in the form of linear movement in one direction only.
a) Piston cylinders
b) Double acting cylinders
c) Single acting cylinders
d) Hydraulic pumps

Explanation:Single acting cylinders converts the compressed air energy into mechanical energy in the form of linear movement in one direction only.

9. A _____________ restricts air flow.
a) Throttle valve
b) Shuttle valve
c) Directional control valve
d) Single acting cylinder

Explanation: Throttle valves are part of the category of flow control valves. They restrict the flow of the compressed air in the flow direction. A throttle valve is used to regulate volumetric flow rates.

10. When the piston area of the cylinder is connected to the atmosphere, the piston of the single-acting cylinder is pressed by the spring to the ________________
a) Cylinder center
b) Cylinder down
c) Cylinder bottom
d) Cylinder upper

Explanation: Piston is the part in the cylinder that is used to create the pressure difference and in case of single-acting cylinder it is pressed by the spring to the cylinder center .

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