Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

EGK Systems > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

Purpose of a stack pipe in Hydraulic Reservoir

A

Protect the emergency systems hydraulic fluid supply in case of a leak

Supplies the main feed line

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Hydraulic Filter

A

Between pressure and return lines to remove contaminants in hydraulic oil. Protecting system from damage

Pop out indicators fitted to warn of impending by pass when filter due to be cleaned replaced soon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Check Valve (Non return valve)

A

Fluid to flow in one direction only
Ball head onto valve by spring
If system pressure falls spring reseats ball to prevent reverse flow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Hydraulic Fluid

A

Allow transmission of pressure and energy/act as a lubricating medium.

Can be a skin and eye irritant

Either synthetic or mineral based

DTD 585 - miner (red)
Skydrol - synthetic (green/purple)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Passive Vs Hydraulic System

A

Passive powered by human effort vs active system that uses pump to raise hydraulic pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Low vs High pressure system

A

Low = 2000 PSI and below
High = 3000 to 5000 PSI

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

High pressure system advantages/disadvantages

A

Size of actuators reduced
Less component mass/saves space

Shear stress
Risk of fluid leaks at joints

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Synthetic Hydraulic Fluid Colour

A

Green

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Mineral Hydraulic fluid colour

A

Red

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Three types of actuator

A

Single acting - only acting on one side spring supply’s return force

Double acting balanced - moves in both directions/ram ends equal both sides

Double acting unbalanced - moves both sides although one side has greater area

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Types of selector valves and purpose

A

Direct fluid around system

Closed centre - constant pressure pump

Open centre - low pressure/pressure generated on demand (one system at a time)

Linear

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Reservoir

A

Stores fluid/pressurised by bleed air

Allows thermal expansion/hold excess fluid for leaks
Pressurised to prevent cavitation
Relief valve protect reservoir from over pressurisation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Role of a accumulator

A

To provide emergency hydraulic power.

Gas/fluid charged by system pressure and gives 5/6 usages of hydraulic pressure

Dampens out fluctuations to main supply
Charged to half system pressure
To charge accumulator normal hydraulic systems need to be removed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Hydraulic Pumps + examples

A

Provide flow to fluid to produce pressure

Engine driven
Electrical
Hand operated
Ram air operated
Hydraulic motor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Constant Delivery Hydraulic Pump

A

Constant fluid supply via spur gear system
Propel around outside of gear
Volume of fluid passing through pump determine by speed rotation of gears

Constant volume of fluid
Uses Automatic cut out valves to regulate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Constant Pressure Pump - Hydraulic Pumps
Axial flow pump

A

Variable volume used on large aircraft 3000+ PSI
Demand pump which delivers required pressure on demand

Piston rotates as fluid enter and turns then removed via outlet
Swash plate determines output from pump via control piston
Driven by gearbox linked to engine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Thermal Relief Valves in Hydraulics

A

Protect against over pressurisation
Detect pressure
Ball and spring too much pressure moves it and allows fluid to return to reservoir

18
Q

Restrictor Valve

A

Slows fluid down

19
Q

Priority Valve - Hydraulics

A

Ensure sufficient flow to primary controls

20
Q

Shuttle Valve - Hydraulics

A

One services operated by two independent supplies

21
Q

Hydraulic Fuse

A

Upstream to shut off flow and prevent total fluid loss

22
Q

Shut Off Valves

A

Close services/hydraulics to areas
(External controlled unlike hydraulic fuses)

23
Q

Power Transfer Unit - Hydraulics

A

Transfers power between hydraulic systems if one was to fail via motor

24
Q

PSI to bars

A

14.7 psi = 1 bar

25
Q

Sea level static pressure

A

14.5 to 15psi or 1 bar

26
Q

Force = …..

A

Force = Pressure x Area

27
Q

Volume = Area x Length

A
28
Q

Open System (On Demand) - Hydraulic Circuit

A

2000 PSI
Pressure only generated on demand
Spur gear pump for power
One at a time

29
Q

Closed system - constant pressure - Hydraulic Circuit

A

Variable volume pump
Services supplied in parallel to be operated simultaneously
Off loading valve to unload when service not operated

30
Q

Automatic cut out valve in constant delivery pumps

A

Regulate hydraulic pressure poppet valve opens when exceeded dump excess pressure

31
Q

Hydraulic Fuse

A

Fitted upstream to shut off flow and prevent total fluid loss in event of a leakage

32
Q

Accumulator - Pumps are running and system is operating

A

Gas pressure equals hydraulic pressure on the gauge

33
Q

A leak in hydraulic system indications

A

High temperature
Low Pressure

34
Q

Hydraulic control panel in cockpit shows…

A

Pressure/Temp/Fluid quantity

35
Q

Baffle Plates in reservoir do…

A

De-aerate the returning fluid

36
Q

Units used in hydraulic systems

A

Lb per in2

37
Q

Indication of a pump failure

A

Master caution and an amber light

38
Q

Typical commercial Airplane uses what system pressure (average)

A

3000PSI

39
Q

ACOV

A

Automatic cut out valve - fitted to system with a constant displacement pump to control pressure from the pump.

Same volume of fluid

Accumulator used with ACOV to prevent the ACOV cutting in and out rapidly

40
Q

Axial flow pump

A

Also referred to as constant pressure variable volume pump

41
Q

Hydraulic viscosity

A

Must be low to allow flow easily at very low temperatures

EGK Systems (15 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions