Hyd

Question 1

Describe pressure

Answer 1

Force exerted on an object measured in Bar

Question 2

Describe force

Answer 2

A push or pull acting upon a body

Measured in newtons

Question 3

Pascals formula is

Answer 3

Pressure=force/area

Question 4

What is flow rate?

Answer 4

Measure of a volume of fluid passing a point in a given time

Gallons per min
Litres per min

Question 5

Describe turbulent flow

Answer 5

• High velocity flow that doesnt move smoothly
• Caused by abrupt changes in direction

Question 6

Flow is measured in….?

Answer 6

Velocity & flow rate

Question 7

What is kinetic energy?

Answer 7

Energy within a fluid by virtue of it’s Mass & Velocity

Kinetic energy=Velocity

Question 8

Describe potential energy

Answer 8

Stored energy in the form of pressure

Potential energy = pressure

Question 9

What is laminar flow?

Answer 9

Low velocity flow with minimal friction

Fluid travels smoothly
Opposity of turbulent flow

Question 10

Define Pascal’s law is….

Answer 10

When pressure applied to a confined fluid is transmitted in all directions undiminished with equal force

Question 11

What is a measurement of Force?

Answer 11

Pressure

Question 12

Describe viscosity

Answer 12

Measure of a fluids resistance to flow measured in centistokes

Question 13

What is 1 micron in mm?

Answer 13

• 1000th of a mm
• 0.001mm

Question 14

What does a hydraulic pump do?

Answer 14

• Turns mechanical energy to hydraulic energy
• Provided with positive suction from header tank

Question 15

Define an actuator

Answer 15

converts hydraulic energy to mechanical work

Question 16

Velocity changes with…

Answer 16

Changes in cross sectional area

Question 17

Bernoulli’s principle states that..

Answer 17

Pressure (potential) & Kinetic (Mass & velocity) must be constant if flow rate is constant

Question 18

What are the 3 basic types of actuators?

Answer 18

1. Rotary
2. Semi rotary
3. Linear