Sheet One

1- State the main categories of fluid power.

- Hydraulic and pneumatic system

2- What are the main components of fluid power system?

a- Power unit group

b- Actuator group

c- Conductors group

d- Control valves group

e- Fluid maintenance group

3- Compare between hydraulic and pneumatic system considering the

following properties (Operating pressure, accuracy of actuator

movement, actuator speed, component weight, system cost)

4- State the variables that become easy to control in both hydraulic and

pneumatic systems.

- Force, torque, speed, power, actuator direction

5- State the components of power group and their function in a fluid

power system.

- Prime mover, pump or compressor, reservoir

6- State the components of actuator group and their function in a fluid

power system.

a- Cylinders produce linear motion.

b- Motors produce rotary motion.

7- State the components of conductors group and their function in a

fluid power system.

- Conductors distribute and transmit fluid throughout the systems.

- Pipes, Tubes, Hoses.

8- State the components of fluid maintenance group and their function

in a fluid power system.

- Filters, Separators, Lubricators.

- Maintains system fluid by removing dirt and contaminates moisture and

excessive heat.

- Assure effective system performance and acceptable service life.

9- State the main categories of control valves.

- Directional control valve, pressure control valve, flow control valve

10- The basic idea behind any hydraulic system is very simple: Force

that is applied at one point is transmitted to another point using ______.

a- incompressible fluid

b- Compressible fluid c- Gas mixture

11- It's important for a hydraulic system to contain what?

a- Air bubbles b- No air bubbles

c- Compressible fluid

12- Where can you look on a car to see a good example of a basic piston-

driven hydraulic system?

a- The power steering system

b- The instrument panel c- The brake system

13- The great thing about hydraulic systems is that the pipe connecting

the two cylinders can be what?

a- any length and shape b- Disconnected, yet still operate

c- Filled with air

14- Fluids are distributed throughout a fluid power system by

components referred to as _____

a- Coils

b- Conductors c- Cables

15- In the pneumatic fluid power system, after the pressurized system

air has completed its work, it is exhausted to the _____.

a- Tank

b- Sink

c- Atmosphere

Sheet Three

1- What are the basic functions of fluid in hydraulic system?

a- Transformation

b- Lubrication

c- Sealing

2- State some important characteristics of hydraulic fluids.

a- Thermal stability

b- Hydraulic stability

c- Low cost

d- Long life

e- Total water rejection

3- Define the following:

a- Viscosity: The internal resistance of a liquid to flow.

b- Fire point: The temperature at which the vapor continues to burn after

being ignited on removal of the ignition source.

c- Pour point: The lowest temperature at which a fluid will flow.

d- Bulk modulus: The measure of the incompressibility.

e- Viscosity index: The number that expresses the rate of viscosity change

in relation to temperature change.

4- Describe the operation of both Saybolt viscometer and the

glass capillary viscosity.

a- Glass capillary:

- It is located in temperature controlled

bath.

- The time is measured and multiplied by a

temperature constant to get kinematic

viscosity.

b- Saybolt viscometer:

- Measure the time required in second, for

60 ml of fluid at specified temperature

(100oF=38oC) to flow through a calibrated

orifice.

- Doesn't truly relate to the standard definition of viscosity, but