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Theory 4 Refrigeration > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

What colour is OX40 & where is it used?

A
  • Green
  • T23’s & T45’s
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2
Q

What colour is OX30 & where is it used?

A
  • Red
  • Submarines
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3
Q

What colour is OM33 & where is it used?

A

Yellow
* T42’s , T22’s

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4
Q

Which type of pump is needed for hydraulic systems?

A

Positive displacement pump
(Hydraulics needs high pressure pumps)

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5
Q

Name 2 basic actuators

A
  1. linear actuator - single or double
  2. Rotary
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6
Q

Hydraulics

A fluid is defined as..

A
  • Takes the shape of a container
  • Transmits power
  • Gas or liquid
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7
Q

What are the advantages of hydraulics?

A
  • Reliable
  • Simple
  • Infinite speed range
  • Easily reversed
  • No spark risks
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8
Q

Disadvantages of hydraulics?

A
  • Fire risk
  • Noise
  • Contamination
  • Less efficient
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9
Q

At what point do o-rings fail?

A
  • 300 degrees
  • Gives off hydrogen flouride which is toxic
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10
Q

PPE for hydraulics

A
  • Gloves
  • Boots
  • Overalls
  • Visor
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11
Q

What are the 2 types of hydraulic oils called?

A
  1. Petroleum
  2. Synthetic
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12
Q

What is Demulsibility?

A

The ability of fluid to seperate from water

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13
Q

What is the name of this pump?

A

External gear pump

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14
Q

What is this pump?

A

Internal gear pump

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15
Q

What is this pump?

A

Lobe pump

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16
Q

What is this pump?

A

Multi cylinder radial piston pump

17
Q

What is this pump?

A

Single piston pump

18
Q

What is the purpose of the drain leg?

A

To return cooling, sealing & lubricating oil from the actuator to the tank

19
Q

What do accumulators do?

A

Smooths out pulsations & store potential energy

20
Q

What does a swash plate do?

A

Controls capacity

21
Q

What type of pump is this?

A

Axial piston pump

22
Q

What systems use an Axial piston pump

A
  • Stabilisers
  • CPP
  • Steering gear
23
Q

What do actuators do?

A

Convert hydraulic energy to mechanical movement

24
Q

What are the requirements of a hydraulic fluid?

A
  1. Transmit power
  2. Flow easily
  3. Lubricate
  4. Cooling
  5. Seal
  6. Be incompressible
25
Q

What are the common causes of contamination to hydraulic oil?

A
  • Construction dirt
  • Moisture
  • Human
  • Dirt in fluid
26
Q

What are some methods of reducing oil contamination?

A
  • Good system design
  • Filters
  • Clean working
  • Good working practices
27
Q

Name 2 types of hydraulic systems

A
  1. Ring main
  2. Standalone power packs
28
Q

Name 2 types of accumulators

A
  1. Bag
  2. Bladder
29
Q

Where is denso tape used?

A

Used on upper deck , stored in inflam store

30
Q

What Pump is this?

A

Vane pump

Theory 4 Refrigeration (5 decks)

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