Hydraulics

Question 1

What is the 3 bits of numbers you get with a cylinder in order?

Answer 1

Piston size
Stroke
Rod size

Question 2

What is the purpose for wipers?

Answer 2

Clean dust / dirt when extending back cylinder

Question 3

What is a stop tube?

Answer 3

It restricts from over extending.

Question 4

What are cushions

Answer 4

Special “cushions” built into each end for less wear and tear on cylinders. (Adjustable)

Question 5

What is a prime mover?

Answer 5

Power source
Ex- hand pump , electric motor.

Question 6

When starting up a system what is one thing you need to complete before hand?

Answer 6

Purge the system with air

Question 7

How is mechanical advantage gained with hydraulics?

Answer 7

By using pascals law (does this by acting As a force multipiler)

Question 8

How is fluid flow measured?

Answer 8

The volume of fluid passing a given point in a unit of time.

Question 9

What is laminar?

Answer 9

Fluid at the outer walls of the conduction moves more slowly than fluid in the centre of the conductor.

Question 10

What is turbulent flow?

Answer 10

When smooth flow is disrupted, the fluid particles move in a random pattern rather than parallel to the direction of flow

Question 11

What is the purpose of DCV

Answer 11

Used to control the direction of hydraulic fluid flow

Question 12

What are the two types of spools for dcvs

Answer 12

Rotary or sliding

Question 13

What is the law of conservation of energy

Answer 13

Energy cannot be destroyed, but it may be converted from one from to another

Question 14

What does pascals law state?

Answer 14

Pressure applied to a confined fluid at rest, force is transmitted equally in every direction and always at right angles to the containing surface

Question 15

What does Bernoulli principle state?

Answer 15

That if the flow rate is constant, the sum of the kinetic energy and the potential energy at various points in the system is constant

Question 16

What are cylinders used to create?

Answer 16

Linear Motion

Question 17

What are motors used to create?

Answer 17

Rotary Motion

Question 18

What is friction?

Answer 18

The resistance to relative motion between two bodies

Question 19

What are the main causes of excessive friction in hydraulic lines ? (4)

Answer 19

Excessive length of lines
Excessive velocity (B/C the lines are too small)
Excessive number of bends or fittings or unsuitable bends or fitting
Sustained flow at high pressure

Question 20

List the five uses for an accumulator?

Answer 20

Shock absorbing
Auxiliary supply
Emergemy supply
Maintain control
Acceleration

Question 21

Four types of gas accumulators?

Answer 21

Compressed air
Dry nitrogen
Nitrogen
Pure oxygen

Question 22

What are the two classes of accumulator?

Answer 22

Weight loaded
Gas charged

Question 23

What are the three most common types of dcv?

Answer 23

Closed, open, tamden

Question 24

Three methods of applying flow control value?

Answer 24

Meter in
Meter out
Bleed off

Question 25

When should a counterbalance value be used?

Answer 25

When maintaining a set pressure in part of a circuit

Question 26

When should A meter out circuit be used?

Answer 26

When a load is pulled downward due to gravity

Question 27

What are motors rated by?

Answer 27

Rpm's

Question 28

What are four types of gas accumulators?

Answer 28

Compressed air Dry nitrogen Nitrogen Pure oxygen

Question 29

What are three factors which affect flow through an orifice?

Answer 29

Velocity, density , orifice area

Question 30

What is cracking pressure?

Answer 30

Barely open

Question 31

Why would you use a temperature gauge?

Answer 31

Monitor for and excessive Heat

Question 32

What are the 3 types of conductors?

Answer 32

Piping material tubing material Flexible hose materials

Question 33

What is the most common flow control valve?

Answer 33

Meter out

Question 34

What does an unloading valve do?

Answer 34

Returns pump output back to resviar after desired pressure is met

Question 35

What does a pressure relief value?

Answer 35

Uses a spring, ball, pottet or piston to release excess system pressure

Question 36

What are the three main function of a counter balance value?

Answer 36

Support Control Safety

Question 37

What is a Major factor in hydraulic component failure?

Answer 37

Contamination

Question 38

What is a purpose of a magnetic drain plug?

Answer 38

Attract steel or iron particles

Question 39

What is the purpose of a strainer ?

Answer 39

Keep large solid objects out of system (think of tufts cove cooler system)

Question 40

What is nominal filter rating mean ?

Answer 40

Removes most particles

Question 41

What does absolute filter mean?

Answer 41

All particles removed,

Question 42

What is bursting pressure?

Answer 42

Wall thickness and the inside diameter of pipe

Question 43

What determines the bursting pressure in a lines

Answer 43

Wall thickness and inside diameter

Question 44

What type of pipe is used in hydraulic systems'

Answer 44

Steamless steel

Question 45

Why is tubing A popular hydraulic conductor

Answer 45

Easily bend and flared

Question 46

What in the purpose of hose?

Answer 46

Connect parts which move in relation to each other

Question 47

What does this centre?

Answer 47

Closed

Question 48

What does this centre show?

Answer 48

Open

Question 49

What does this centre show?

Question 50

How is pressure created in a hydraulic system?

Answer 50

Created by resistance to flow

Question 51

How many inches cubed in imp gal?

Answer 51

277 inches cubed

Question 52

How many inches cubed in us gals?

Answer 52

231 inch cubed

Question 53

How do you find pressure?

Answer 53

Force divided by area

Question 54

How do you find force?

Answer 54

Pressure x area

Question 55

How do you find area?

Answer 55

Force divided by area

Question 56

How is force represented? (Units)

Answer 56

Lbs

Question 57

How is area represent? (Units)

Answer 57

Inches squared

Question 58

How is pressure shown? (Units)

Answer 58

Psi

Question 59

What is recommended height on return and section lines?

Answer 59

11/2 to 2 times the pipe diameter

Question 60

The volume of fluid in the reservoir is normally equal to _____________ the rated pump delivery for one minute

Answer 60

2 to 3 times.

Question 61

What are flow meters used for?

Answer 61

Monitor the flow in a line and to determine the efficiency of pumps and motors

Question 62

What are the three main parts of an hose?

Answer 62

Inner tube Reinforcement Outer protective cover