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Theory 4 > Theory 4 > Flashcards

Theory 4 Flashcards

1
Q

How do you reduce water hammer?

A

Air eliminator

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2
Q

1 symptom of air in a system is know as?

A

Water Hammer

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3
Q

The 3 water tests?

A

Visual test
Chlorine
Taste

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4
Q

Purpose of fresh water?

A

Laundry
Galley
Showers and sinks
Water heaters
Medical use
Bridge window washers
Fresh water hose reels
Machinery cooling
Gas turbine washing

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5
Q

What does CCV valve stand for?

A

Concentration control valve

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6
Q

How much does the bag filter filter down to?

A

60 microns

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7
Q

What is the TDS figure of sea water ejected back?

A

56,000 TDS

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8
Q

What is the TDS of fresh water after desalination?

A

Between 250 - 300 PPM

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9
Q

What is the TDS of sea water?

A

34,000 PPM

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10
Q

What is the measurement of water purity?

A

TDS

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11
Q

What does TDS stand for?

A

Total dissolved solids

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12
Q

What is reverse osmosis?

A

Turns sea water to fresh water

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13
Q

What does a actuator do?

A

Converts hydraulic energy into mechanical energy

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14
Q

2 types of actuator?

A

Rotary
Linear

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15
Q

A axial piston pump has a …..?

A

Swash plate

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16
Q

What is a axial piston pump used for?

A

Stabilizer systems
CPP systems
steering systems

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17
Q

Purpose of the drain leg?

A

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

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18
Q

6 types of gear pump?

A

External gear pump
Internal gear pump
Vane pump
Lobe pump
Single piston pump
Multi cylinder radial pump

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19
Q

Common causes of contamination?

A

Airborne particles and moisture
Construction dirt
Dirt in new fluid
Dirt produced by wearing in new systems
Dirt from human sources

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20
Q

5 oil additives?

A

Anti - foam
Anti - oxidants
Anti - corrosion
Demalsibility
Pour point depressant

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21
Q

3 oils used in hydraulics?

A

OX30 - Red - used on submarines
OM33 - Yellow - used on Type 42,22
OX40 - Green - used on Type 23, 45

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22
Q

2 types of oils?

A

Mineral
Synthetic

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23
Q

Advantages of hydraulics over electric systems?

A

Reliable
Simple and easy to understand
Infinite speed range
Easily reversed
Ability to withstand overload
No spark risk
High torque at low speeds
1/12 size of equivalent electric motor

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24
Q

What is a fluid defined as?

A

A substance that will take the shape of its container
Capable of transmitting power
Can a liquid or gas

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25
Q

Disadvantages of hydraulics?

A

Fire risk on mineral oil systems
Noise
Risk of contamination
Less efficient (85-95%)

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26
Q

What temperature do O ring sills fail/melt at?

A

300°C

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27
Q

What is crash stop?

A

Allows all fans to be stopped in case of emergency. I.E in case of a fire or crash

28
Q

Where can crash stop be activated from?

A

HQ1 or the SSC

29
Q

What PPE do you need when working with Fluorocarbon Elastomers?

A

PVC gloves
PVC coveralls
Rubber boots
Full-face visor

30
Q

What do air bleed valves do?

A

Maintain the citadel pressure at required amount above atmospheric pressure and maintains a degree of hability

31
Q

5 steps of a citadel test?

A

1 - Close all openings on citadel boundary and put system on re-circ
2 - Open AFU inlets and start AFU’s
3 - Restrict access to and from citadel to essential personal only (Airlocks must be used)
4 - Search for leaks and carry out repairs, 2 Inch vacuum is required
5 - Record the result of the test

32
Q

When do you test the citadel?

A
  • Annually
  • Prior to DED (Docking extended duration)
  • During harbor acceptance trails
  • During sea acceptance trails
  • All ships are required to carry out a citadel test during FOST work-up
33
Q

Percentages of fresh and recirc air in ATU systems?

A

Fresh air = 33%
Recirc air = 67%

34
Q

6 types of common filters?

A

Panel filter
Supply filters
Grease filters
Lint filters
Dust filters
Flameproof gauze’s

35
Q

Where would you expect to find “special filters”?

A

Galleys
Store rooms
Auxiliary machinery spaces
Magazines
Paint stores

36
Q

4 basic combinations for supply and exhaust of ventilation?

A

fan supply and fan exhaust
fan supply and natural exhaust
natural supply and fan exhaust
natural supply and natural exhaust

37
Q

5 Equipment and uses that require ventilation?

A

Electric systems
CBRN
Habitability
Main machinery space cooling
galley ventilation

38
Q

What does fruit and veg produce when it rots?

A

Carbon dioxide

39
Q

when refrigerant gets hot what gas does it produce?

A

Phosgene gas (Mustard gas)

40
Q

Chilled water plants are used to cool what?

A

Weapon systems
Radars
Ships computer system
Air treatment units (ATU)

41
Q

How can you add oil to the sump?

A

Sump filler pump
Hand pump
Dosing pot

42
Q

What does hygroscopic mean?

A

Absorbs oil readily

43
Q

3 Lubrication’s used in refrigeration?

A

OM70 - general purpose used with CFC/HCFC
Suniso 3GS - synthetic oil used on type 23
SW68 - synthetic oil used on R13A refrigerants

44
Q

5 methods of leak detection?

A

IRLDS (Infra red leak detection system)
Oil slicks
Spectroline dye
Snoop
Halogen leak detector

45
Q

3 means of heat transfer?

A

Conduction (direct contact)

Convection (Radiators)

Radiation (The sun)

46
Q

4 Examples of on board refrigeration plants?

A

Cold room -18 to -22
Cool dry room +4 to +6
Fruit and veg store +4 to +6
Galley ready use cupboard +5 to +7

47
Q

Cold room temperature?

A

-18 to -22

48
Q

Cool dry dairy temperature?

A

+4 to +6

49
Q

Fruit and veg store temperature?

A

+4 to +6

50
Q

Galley ready use cupboard temperature?

A

+5 to +7

51
Q

The 2 colors on a sight glass indicator?

A

Green = good = dry
Yellow = bad = moisture

52
Q

What is the Montreal Protocol?

A

CFC gases

53
Q

What is the Kyoto Summit?

A

Reduces greenhouse gases

54
Q

9 steps on bringing on fresh water?

A

1 - Must be flushed before use
2 - Unscrew the deck cap
3 - Fit the filing goose neck
4 - Connect hoses to shore supply
5 - Open the shore filling supply valve and flush
6 - Carry out water tests
7 - Shut off shore filling valve
8 - Connect hoses to deck filling goose neck
9 - Dip and record level in tanks

55
Q

What color are fresh water hoses?

A

Blue

56
Q

3 types of defrosting?

A

Natural
Electrical heating coils
Hot gas

57
Q

When do you use hot gas defrosting?

A

Once a day 15 minutes 4 times a day

58
Q

When do you use electrical heating coils?

A

Maximum 1 hour every 24 hours

59
Q

When do you use natural defrosting?

A

Every 3-6 months normally at maintenance periods

60
Q

What is Latent heat?

A

Changes the state of a substance but with no increase in temperature

61
Q

What is Super heat?

A

Anything over 100°C

62
Q

What is Sensible heat?

A

Temperature is rising but their is no change in state.

63
Q

4 types of heat on the water steam table diagram?

A

Latent heat
Super heat
Sensible heat
Sub cooling

64
Q

What is the sub cooling stage on the water steam table diagram?

A

Just before 100°C around 90°C

65
Q

What is demulsibility?

A

Ability of oil to separate from water

66
Q

2 Types of hydraulic oils?

A

Petroleum
Synthetic

Theory 4 (1 decks)

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