Brainscape's Knowledge GenomeTM

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


See full index

Theory 4 > theory 4 > Flashcards

theory 4 Flashcards

1
Q

which way will heat transfer from?

A

Hot to cold

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

what’s convection

A

transferred by mass motion of molecules
eg. radiators

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

What’s conduction

A

Transferred by direct contact

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

Radiation mean of transfer

A

The sun heating the earth

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

3 things water can exist as

A

solid/liquid/gas

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

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

A

heat

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

types of actuator?

A

rotary and linear

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

what do actuators do?

A

converts hydraulic energy into mechanical energy

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

what is reverse osmosis?

A

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

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

what is the measurement of water purity?

A

TDS (total dissolved solids)

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

what is the TDS of sea water?

A

34000ppm

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

what is the TDS of fresh water after desalination ?

A

between 250-300 ppm

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

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

A

56000TDS

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

How much does the bag filter, filter down to?

A

60 microns

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

whats CCV stand for?

A

concentration control valve

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

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

3 water tests?

A

visual test, chlorine test, taste test

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

how do you reduce water hammer?

A

air eliminator

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

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

2 types of oil?

A

mineral, synthetic

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

5 oil additives?

A

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

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

types of pump?

A

external gear pump
internal gear pump
vane pump
lobe pump
single piston pump
multi cylinder radial pump

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

axial piston pump has a …. and what is it used for?

A

swash plate

stabiliser systems
CPP systems
steering systems

27
Q

purpose of the drain leg?

A

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

28
Q

what temp temp do o rings melt/fail at?

A

300’C

29
Q

Disadvantages of hydraulics

A

fire risk on mineral oil systems
noise
risk of contamination
less efficient (85-95%)

30
Q

what PPE do you need when working on fluorocarbon elastomers?

A

PVC gloves
PVC overalls
rubber boots
full-face visor

31
Q

what is the crash stop and where can it be done?

A

allows all fans to be stopped in case of an emergency. i.e. fire
done at hq1 SCC

32
Q

3 lubrications used in refrigeration?

A

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
Q

what does Hygroscopic mean?

A

absorbs oil quickly

34
Q

how can you add oil to the sump?

A

sump filler pump
hand pump
dosing pot

35
Q

Chilled water plants are used to cool?

A

weapon systems
radars
ships computer system
Air treatment units (ATU)

36
Q

if refrigerants gets hot, what gas will it produce?

A

phosgene gas (mustard gas)

37
Q

what does fruit and veg produce when it rots?

A

carbon dioxide

38
Q

5 equipment and uses that require ventilation?

A

cooling electric systems
CBRN
habitability
main machinery space cooling
galley ventilation

39
Q

4 basic combinations for supply and exhaus of ventilation are?

A

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

40
Q

where would you expect to find special filters

A

galleys
store rooms
auxiliary machinery spaces
magazines
paint stores

41
Q

6 types of common filters?

A

Panel filter
supply filter
grease filter
lint filter
dust filter
flameproof gauzes

42
Q

percentages of fresh air and recirc air in atu system

A

fresh air= 33 %
recirc air= 67%

43
Q

citadel test when?

A

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
Q

citadel test as follows 5 steps?

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 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
Q

what do air bleed valves do?

A

maintain the citadel pressure at required amount above atmospheric pressure and maintain a degree of habitat ability.

46
Q

what’s sensible heat?

A

temp is rising but no change in state

47
Q

whats super heat?

A

anything over 100’C is classes as superheat

48
Q

what’s latent heat?

A

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

49
Q

what’s natural defrosting?

A

it will defrost naturally when you turn all electrics off and is done every 3-6 months

50
Q

what are electrical heating coils?

A

either rod type or wrap around coils in the evaporator. for a maximum of 1 hour when needed.

51
Q

what’s hot gas defrosting?

A

using hot/high pressure vapours pushed through evaporator to defrost coils, don’t every day for 4x15 mins

52
Q

steps to take on fresh water?

A

-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
Q

what is the Kyoto summit about?

A

reduce greenhouse gases

54
Q

what is the Montreal protocol about?

A

CFC gases

55
Q

2 colours on a sight glass indicator?

A

green= good,dry
yellow= bad, moisture

56
Q

types of hydraulic fluid?

A

petroleum based
synthetic based

57
Q

4 examples of on board plants and there temps?

A

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
Q

3 means of heat transfer?

A

conduction= direct contact
convection= radiators
radiation= sun

59
Q

5 methods of leak detection?

A
  • IRLDS (infra red leak detection system)
    -oil slicks
    -spectroline dye
    -snoop
    -halogen leak detector
60
Q

what do to reduce contamination?

A

good design
filtration and maintenance
operation of filter
good working practices
guardian filter packs
caps on open ended pipes
clean working area

61
Q

2 hydraulic systems on board?

A

ring main and stand alone power packs

62
Q

what’s an accumulator?

A

stores potential energy

63
Q

types of accumulator?

A

bag and bladder

Theory 4 (1 decks)

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