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theory 4 Flashcards

1
Q

which way will heat transfer from?

A

Hot to cold

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2
Q

what’s convection

A

transferred by mass motion of molecules
eg. radiators

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3
Q

What’s conduction

A

Transferred by direct contact

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4
Q

Radiation mean of transfer

A

The sun heating the earth

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5
Q

3 things water can exist as

A

solid/liquid/gas

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6
Q

the change solid water into a gas what must be added to change its state?

A

heat

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7
Q

types of actuator?

A

rotary and linear

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8
Q

what do actuators do?

A

converts hydraulic energy into mechanical energy

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9
Q

what is reverse osmosis?

A

turns salt water to fresh water. By taking salt away using membranes.

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10
Q

what is the measurement of water purity?

A

TDS (total dissolved solids)

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11
Q

what is the TDS of sea water?

A

34000ppm

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12
Q

what is the TDS of fresh water after desalination ?

A

between 250-300 ppm

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13
Q

what is the TDS of figure of sea water ejeceted back?

A

56000TDS

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14
Q

How much does the bag filter, filter down to?

A

60 microns

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15
Q

whats CCV stand for?

A

concentration control valve

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16
Q

purposes of fresh water?

A

Laundry, galley, showers n sinks, water heaters, medical use, bridge window washers, fw hose reels, machinery cooling, GT washing

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17
Q

3 water tests?

A

visual test, chlorine test, taste test

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18
Q

how do you reduce water hammer?

A

air eliminator

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19
Q

what is fluid defined as?

A

a substance that will take the shape of its container, capable of transmitting power, can be a liquid or gas

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20
Q

advantages of hydraulics over electric systems?

A

reliable, simple n easy to understand, infinite speed range, easily reversed, ability to with stand overload, no spark risk, high torque at low speed and 1/12 size of equipment electric motor.

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21
Q

2 types of oil?

A

mineral, synthetic

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22
Q

3 oils used in hydraulics?

A

ox30- red in colour used on submarine
om33- yellow/orange used on T42,T22
ox44- green used on T23,T45

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23
Q

5 oil additives?

A

anti foam, anti oxidants, anti corrosion, demulsibility, pour point depressant.

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24
Q

common causes of contamination?

A

airborne particles and moisture
construction dirt
dirt in a new fluid
dirt produced by wearing in new systems
dirt from human sources

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25
types of pump?
external gear pump internal gear pump vane pump lobe pump single piston pump multi cylinder radial pump
26
axial piston pump has a .... and what is it used for?
swash plate stabiliser systems CPP systems steering systems
27
purpose of the drain leg?
to return cooling, sealing and lubricating oil from the actuator to the tank
28
what temp temp do o rings melt/fail at?
300'C
29
Disadvantages of hydraulics
fire risk on mineral oil systems noise risk of contamination less efficient (85-95%)
30
what PPE do you need when working on fluorocarbon elastomers?
PVC gloves PVC overalls rubber boots full-face visor
31
what is the crash stop and where can it be done?
allows all fans to be stopped in case of an emergency. i.e. fire done at hq1 SCC
32
3 lubrications used in refrigeration?
om70- general purpose used with CFC/HCFC suniso 3gs- synthetic oil used on T23 and T boats sw68- synthetic oil used on R13A refridgerants
33
what does Hygroscopic mean?
absorbs oil quickly
34
how can you add oil to the sump?
sump filler pump hand pump dosing pot
35
Chilled water plants are used to cool?
weapon systems radars ships computer system Air treatment units (ATU)
36
if refrigerants gets hot, what gas will it produce?
phosgene gas (mustard gas)
37
what does fruit and veg produce when it rots?
carbon dioxide
38
5 equipment and uses that require ventilation?
cooling electric systems CBRN habitability main machinery space cooling galley ventilation
39
4 basic combinations for supply and exhaus of ventilation are?
Fan supply and fan exhaust fan supply and natural exhaust natural supply and fan exhaust natural supply and natural exhaust
40
where would you expect to find special filters
galleys store rooms auxiliary machinery spaces magazines paint stores
41
6 types of common filters?
Panel filter supply filter grease filter lint filter dust filter flameproof gauzes
42
percentages of fresh air and recirc air in atu system
fresh air= 33 % recirc air= 67%
43
citadel test when?
annually prior to DED (docking extended duration) during harbour acceptance traits during sea acceptance traits all ships are required to carryout a citadel test during FOST work-up
44
citadel test as follows 5 steps?
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 essenstial personnel only Airlocks must be used 4= search for leaks and carry out repairs 2inch vacuum is required 5= record the result of the test
45
what do air bleed valves do?
maintain the citadel pressure at required amount above atmospheric pressure and maintain a degree of habitat ability.
46
what's sensible heat?
temp is rising but no change in state
47
whats super heat?
anything over 100'C is classes as superheat
48
what's latent heat?
changes the state of a substance but with no increase in temperature
49
what's natural defrosting?
it will defrost naturally when you turn all electrics off and is done every 3-6 months
50
what are electrical heating coils?
either rod type or wrap around coils in the evaporator. for a maximum of 1 hour when needed.
51
what's hot gas defrosting?
using hot/high pressure vapours pushed through evaporator to defrost coils, don't every day for 4x15 mins
52
steps to take on fresh water?
-fresh water hoses are blue -must be flushed before use -unscrew the deck cap -fit the filing gooseneck -connect hoses to shore supply -open the shore filling supply valve and flush -carry out water tests -shut off shore filing valve - connect hoses to deck filling gooseneck -dip and record level in tanks
53
what is the Kyoto summit about?
reduce greenhouse gases
54
what is the Montreal protocol about?
CFC gases
55
2 colours on a sight glass indicator?
green= good,dry yellow= bad, moisture
56
types of hydraulic fluid?
petroleum based synthetic based
57
4 examples of on board plants and there temps?
cold room = -18 to -22'C cool dry dairy= 4 to 6'C fruit and veg store= 4 to 6'C galley ready use cupboard= 5 to 7'C
58
3 means of heat transfer?
conduction= direct contact convection= radiators radiation= sun
59
5 methods of leak detection?
- IRLDS (infra red leak detection system) -oil slicks -spectroline dye -snoop -halogen leak detector
60
what do to reduce contamination?
good design filtration and maintenance operation of filter good working practices guardian filter packs caps on open ended pipes clean working area
61
2 hydraulic systems on board?
ring main and stand alone power packs
62
what's an accumulator?
stores potential energy
63
types of accumulator?
bag and bladder

Theory 4 (1 decks)

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