Theory 4 Flashcards
1
Q
Conduction is
A
Heat transfer through direct contact
2
Q
Convection
A
Heat transfer through mass motion of molecules
3
Q
Radiation transfer is
A
Heat transfer through electromagnetic radiation
4
Q
Cool room and cold room are
A
Cool-fridge
Cold-freezer
5
Q
The lower the pressure does what to the boiling point
A
Lowers it
6
Q
Increase the pressure it will what to to the boiling point
A
Increase it
7
Q
Sensible heat is
A
Temperature change but no change in state
8
Q
Latent heat is
A
Change in state but no increase in temperature
9
Q
If a temp goes from 120 to 90 what is the sub cooling
A
30 sub cooling
10
Q
Cold room temp
A
-18 -22
11
Q
Fruit and veg temp
A
+4 +6
12
Q
Galley ready use cupboard temp
A
+5 +7
13
Q
Liquid receiver does what
A
Holds and retains refrigerant during maintenance and provides seal between condenser and tev
14
Q
What does the liquid line stop valve do
A
By shutting this and running compressor it will cause liquid receiver to fill
15
Q
What is the Montreal protocol
A
Agreement to cut out CFC production
16
Q
Ozone depletion substances
A
CFCs,HCFCs,HALONs
17
Q
Kyoto summit
A
Agreement to reduce greenhouse gases
18
Q
5 leak detections
A
-IRLDs
-oil slicks
-spectolyne dye
-snoop
-halogen leak detector
19
Q
3 oils in rn oil refrigerant
A
Om70-general purpose
Suniso-type 23
Sw68-used with R134a refrigerant
20
Q
Hygroscopic
A
Absorbs moisture rapidly
21
Q
Tin sizes
A
500ml to 5ltr
22
Q
How to add oil to sump
A
Sump filler plug
Hand pump
Dosing pot
23
Q
Chilled water plants cool
A
Weapons systems
Radars
Ships computer systems
ATUs
24
Q
Exhaust fans are at what level and remove what
A
At deck level and remove any remaining refrigerant
25
8 steps when entering freezer
-Someone knows where u are
-BA charging
-fans running
-no smoking
-IRDLs is working
-warning lights work
-century with u
-door safety works
26
Fan supply/fan exhaust
WCs,galley,machinery space
27
Fan supply/natural exhaust
Stores room and workshop
28
Natural supply/fan exhaust
Remove flammable vapour
29
Natural supply/natural exhaust
Minor occupied areas
30
6 filters
Panel
Supply
Grease
Lint
Dust
Flameproof gauzes
31
Stps require how many changed per hour
15
32
Magazines need how much fresh air
100%
33
Recirculated air percentages
67% re circulation
33% drawn in
34
Mk 6
Mk7
Mk 3
200 ft3
200ft3
500ft3
35
How to citadel test
Close all openings
Open AFU inlets and start AFU
restrict access-air locks used
Search for leaks
Record result of test
36
Air bleed valves set at
Half inch
37
Crash stop is
Stops vents round ship in event of fire and is in scc/hq1
38
4 things hydraulics are used for
Weapons systems
Water tight doors
Deck machinery
Steering
39
Fluid is
Substance that takes the shape of its container
40
Difference between liquid and gas
Liquid used in hydraulic and can’t be compressed
Gas used pneumatic
41
5 reasons hydraulics are good
Reliable
Simple to understand
Infinite range of speed
Easily reversed
Withstand overload
No spark risk
42
Why are hydraulics bad
Fire risk with mineral oil
Noise
Risk of contamination
Less efficient-85-95%
43
Denso tape
Used on upper deck
Prevent corrosion
Stored in inflame stores
44
O-seals melt at
300
45
PPE with flurocarbon
Boots
Gloves
Overalls
Visor
46
Petroleum based fluid is
Inexpensive and general purpose
47
Synthetic based fluid is
Man made
Specific purpose
48
Ox30 is what colour and used when
Red and used on submarines
49
Om33 is what colour and used on
Yellow and carriers
50
Ox40 is what colour and used on
Green and used on type 45
51
Hazards with hydraulics
Skin irritation
Change clothing
Leaks cleaned up immediately
Flexi hoses in date
-Always consult the hazard data sheet
52
Hydraulic fluid must be
Incompressible
Good lubricant
Good sealing properties
Gives up heat
53
Oil additives
Anti foam
Anti oxidants
Anti corrosion
Demulsizillity
Pour point depressant
54
Where does hydraulic oil contaminants come from
Airborne
Construction dirt
Dirt in new fluid
-Dirt produced by wear in new system
-dirt from human source
55
How to reduce contamination
Good design
Filter maintenance
Clogging indicator
Good working practices
Caps on open ended pipes
Clean working area
56
2 hydraulic systems
Ringmain
Stand alone power packs
57
2 types of pumps
Dynamic and positive
58
5 types of positive pumps
External gear pump
Internal gear pump
Vane pump
Single piston pump
Lobe pump
59
What does an actuator do
Converts energy into mechanical motion
60
What does a drain leg do
Used for cooling and to return back to the tank
61
What does an accumulator do
Store’s potential energy and smooths out pulsations
62
Axial pumps are used in (bi-directional)
Stabiliser system
CPP
Steering system
63
2 characteristics of axial pumps
Variable capacity
Bi-direction
64
2 types of actuators
Linear
Rotary
65
What does a swash plate do
Can adjust the pressure by changing angle and applies pressure to piston pumps
66
What percentage of sw is ejected
80%
67
What’s the tds after desalination
Between 250-300ppm
68
After the salt water is mixed what’s the ppm
56000ppm
69
What’s the microns at stage 1 of the filter bag
60
70
What’s the microns after the pre filters
10 microns
71
What bar is displacement pump
10-65
72
What’s does the concentration control valve do
Closed down increases back pressure to ensure reverse osmosis happens
73
Chlorine levels kept at what ppm and supervised by who
0.2ppm
Section head
74
Purpose of fresh water systems
Laundry
Galley
Showers/sink
Water heaters
Medical use
Bridge window washers
Fresh water hose reels
Machinery cooling
Gas turbine washing
75
Bringing on fresh water steps 1-7
-Draw hoses
-Unscrew deck cap to filling connection
-fit gooseneck to relief valve
-connect hoses to shore water supply
-open shore filling supply valve and flush through the hoses
-Carry out water tests(visual,chlorine,taste)
-shut off shore filling supply valve
76
What size are the tins
500ml and 5L
77
How may oil be added to the sump
Sump filler plug
Hand pump
Dosing pot
78
Chilled water plants replaces
Replace the evaporator with chiller with ring main
79
Chilled water plants cool what
Weapons systems
Radars
Ship’s computers
ATUs
80
What 2 things control the calorifier
Thermostat and pressure gauge
81
What does a run down valve do
Drains calorifier for maintenance
82
Air eliminator does what
Reduce affects of water hammer
83
What additives are in the synthetic oil
Anti-foam-prevents bubbles
Anti oxidants-reduce sludge
Anti-corrosion
Denulsibility-separates water
Pour point depressant-maintains the oil to pour
84
How to reduce contamination
filter maintanence
Clogging indicator
Good working practices
Guardian filter pack
caps on open ended pipes
clean working area
85
2 types of actuators
Linear,rotary
86
Chlorine levels are kept at what ppm
0.2ppm
87
How many air changes does an stp require
15 per hour
88
Pre particulate filter does what
Paper filter to remove particles
89
Particulate filter does what
Made of gas and removes bacteria
90
Gas filter does what
Removes warfare chemicals
91
When to do citadel test
Annually
Prior to ded
During hats and says
All ships during FOST work up
92
Crash stop button does what
Built in ventilation stop system built in hq1/scc
93
What makes a fluid good
-Substance that can take the shape of its container
-capable of transmitting power
-it can be a liquid or gas
94
Difference between pneumatic and hydraulic
Pneumatic-air system
Hydraulic-liquid system
95
Bi directional flow is in what
Stabiliser system
Cpp system
Steering system
96
Drain leg is
Used for cooling and to return to the tank
97
TDS stands for
Total dissolved solids
98
TDS of sea water is at around
34000
99
Chlorine levels are kept at what and who supervises it
0.2ppm and section head
100
What ppm goes to the made water tank
350
101
Permeate and made water are made through what filter
Membrane
102
How to control calorifier
Thermostat
Pressure gauge
Pressure relief valve
103
A run down valve does what
Allows you to drain calorifier for maintenance
104
3 filters
Pre particulate-paper,coarse particle
Particulate-glass,bacteria,holds onto it
Gas filter-warfare chemicals,charcoal
