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Mech 4 RN > Theory 4 > Flashcards

Theory 4 Flashcards

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1
Q

Conduction is

A

Heat transfer through direct contact

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2
Q

Convection

A

Heat transfer through mass motion of molecules

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3
Q

Radiation transfer is

A

Heat transfer through electromagnetic radiation

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4
Q

Cool room and cold room are

A

Cool-fridge
Cold-freezer

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5
Q

The lower the pressure does what to the boiling point

A

Lowers it

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6
Q

Increase the pressure it will what to to the boiling point

A

Increase it

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7
Q

Sensible heat is

A

Temperature change but no change in state

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8
Q

Latent heat is

A

Change in state but no increase in temperature

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9
Q

If a temp goes from 120 to 90 what is the sub cooling

A

30 sub cooling

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10
Q

Cold room temp

A

-18 -22

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11
Q

Fruit and veg temp

A

+4 +6

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12
Q

Galley ready use cupboard temp

A

+5 +7

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13
Q

Liquid receiver does what

A

Holds and retains refrigerant during maintenance and provides seal between condenser and tev

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14
Q

What does the liquid line stop valve do

A

By shutting this and running compressor it will cause liquid receiver to fill

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15
Q

What is the Montreal protocol

A

Agreement to cut out CFC production

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16
Q

Ozone depletion substances

A

CFCs,HCFCs,HALONs

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17
Q

Kyoto summit

A

Agreement to reduce greenhouse gases

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18
Q

5 leak detections

A

-IRLDs
-oil slicks
-spectolyne dye
-snoop
-halogen leak detector

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19
Q

3 oils in rn oil refrigerant

A

Om70-general purpose
Suniso-type 23
Sw68-used with R134a refrigerant

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20
Q

Hygroscopic

A

Absorbs moisture rapidly

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21
Q

Tin sizes

A

500ml to 5ltr

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22
Q

How to add oil to sump

A

Sump filler plug
Hand pump
Dosing pot

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23
Q

Chilled water plants cool

A

Weapons systems
Radars
Ships computer systems
ATUs

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24
Q

Exhaust fans are at what level and remove what

A

At deck level and remove any remaining refrigerant

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25
Q

8 steps when entering freezer

A

-Someone knows where u are
-BA charging
-fans running
-no smoking
-IRDLs is working
-warning lights work
-century with u
-door safety works

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26
Q

Fan supply/fan exhaust

A

WCs,galley,machinery space

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27
Q

Fan supply/natural exhaust

A

Stores room and workshop

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28
Q

Natural supply/fan exhaust

A

Remove flammable vapour

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29
Q

Natural supply/natural exhaust

A

Minor occupied areas

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30
Q

6 filters

A

Panel
Supply
Grease
Lint
Dust
Flameproof gauzes

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31
Q

Stps require how many changed per hour

A

15

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32
Q

Magazines need how much fresh air

A

100%

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33
Q

Recirculated air percentages

A

67% re circulation
33% drawn in

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34
Q

Mk 6
Mk7
Mk 3

A

200 ft3
200ft3
500ft3

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35
Q

How to citadel test

A

Close all openings
Open AFU inlets and start AFU
restrict access-air locks used
Search for leaks
Record result of test

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36
Q

Air bleed valves set at

A

Half inch

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37
Q

Crash stop is

A

Stops vents round ship in event of fire and is in scc/hq1

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38
Q

4 things hydraulics are used for

A

Weapons systems
Water tight doors
Deck machinery
Steering

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39
Q

Fluid is

A

Substance that takes the shape of its container

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40
Q

Difference between liquid and gas

A

Liquid used in hydraulic and can’t be compressed
Gas used pneumatic

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41
Q

5 reasons hydraulics are good

A

Reliable
Simple to understand
Infinite range of speed
Easily reversed
Withstand overload
No spark risk

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42
Q

Why are hydraulics bad

A

Fire risk with mineral oil
Noise
Risk of contamination
Less efficient-85-95%

43
Q

Denso tape

A

Used on upper deck
Prevent corrosion
Stored in inflame stores

44
Q

O-seals melt at

A

300

45
Q

PPE with flurocarbon

A

Boots
Gloves
Overalls
Visor

46
Q

Petroleum based fluid is

A

Inexpensive and general purpose

47
Q

Synthetic based fluid is

A

Man made
Specific purpose

48
Q

Ox30 is what colour and used when

A

Red and used on submarines

49
Q

Om33 is what colour and used on

A

Yellow and carriers

50
Q

Ox40 is what colour and used on

A

Green and used on type 45

51
Q

Hazards with hydraulics

A

Skin irritation
Change clothing
Leaks cleaned up immediately
Flexi hoses in date
-Always consult the hazard data sheet

52
Q

Hydraulic fluid must be

A

Incompressible
Good lubricant
Good sealing properties
Gives up heat

53
Q

Oil additives

A

Anti foam
Anti oxidants
Anti corrosion
Demulsizillity
Pour point depressant

54
Q

Where does hydraulic oil contaminants come from

A

Airborne
Construction dirt
Dirt in new fluid
-Dirt produced by wear in new system
-dirt from human source

55
Q

How to reduce contamination

A

Good design
Filter maintenance
Clogging indicator
Good working practices
Caps on open ended pipes
Clean working area

56
Q

2 hydraulic systems

A

Ringmain
Stand alone power packs

57
Q

2 types of pumps

A

Dynamic and positive

58
Q

5 types of positive pumps

A

External gear pump
Internal gear pump
Vane pump
Single piston pump
Lobe pump

59
Q

What does an actuator do

A

Converts energy into mechanical motion

60
Q

What does a drain leg do

A

Used for cooling and to return back to the tank

61
Q

What does an accumulator do

A

Store’s potential energy and smooths out pulsations

62
Q

Axial pumps are used in (bi-directional)

A

Stabiliser system
CPP
Steering system

63
Q

2 characteristics of axial pumps

A

Variable capacity
Bi-direction

64
Q

2 types of actuators

A

Linear
Rotary

65
Q

What does a swash plate do

A

Can adjust the pressure by changing angle and applies pressure to piston pumps

66
Q

What percentage of sw is ejected

A

80%

67
Q

What’s the tds after desalination

A

Between 250-300ppm

68
Q

After the salt water is mixed what’s the ppm

A

56000ppm

69
Q

What’s the microns at stage 1 of the filter bag

A

60

70
Q

What’s the microns after the pre filters

A

10 microns

71
Q

What bar is displacement pump

A

10-65

72
Q

What’s does the concentration control valve do

A

Closed down increases back pressure to ensure reverse osmosis happens

73
Q

Chlorine levels kept at what ppm and supervised by who

A

0.2ppm
Section head

74
Q

Purpose of fresh water systems

A

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

75
Q

Bringing on fresh water steps 1-7

A

-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
Q

What size are the tins

A

500ml and 5L

77
Q

How may oil be added to the sump

A

Sump filler plug
Hand pump
Dosing pot

78
Q

Chilled water plants replaces

A

Replace the evaporator with chiller with ring main

79
Q

Chilled water plants cool what

A

Weapons systems
Radars
Ship’s computers
ATUs

80
Q

What 2 things control the calorifier

A

Thermostat and pressure gauge

81
Q

What does a run down valve do

A

Drains calorifier for maintenance

82
Q

Air eliminator does what

A

Reduce affects of water hammer

83
Q

What additives are in the synthetic oil

A

Anti-foam-prevents bubbles
Anti oxidants-reduce sludge
Anti-corrosion
Denulsibility-separates water
Pour point depressant-maintains the oil to pour

84
Q

How to reduce contamination

A

filter maintanence
Clogging indicator
Good working practices
Guardian filter pack
caps on open ended pipes
clean working area

85
Q

2 types of actuators

A

Linear,rotary

86
Q

Chlorine levels are kept at what ppm

A

0.2ppm

87
Q

How many air changes does an stp require

A

15 per hour

88
Q

Pre particulate filter does what

A

Paper filter to remove particles

89
Q

Particulate filter does what

A

Made of gas and removes bacteria

90
Q

Gas filter does what

A

Removes warfare chemicals

91
Q

When to do citadel test

A

Annually
Prior to ded
During hats and says
All ships during FOST work up

92
Q

Crash stop button does what

A

Built in ventilation stop system built in hq1/scc

93
Q

What makes a fluid good

A

-Substance that can take the shape of its container
-capable of transmitting power
-it can be a liquid or gas

94
Q

Difference between pneumatic and hydraulic

A

Pneumatic-air system
Hydraulic-liquid system

95
Q

Bi directional flow is in what

A

Stabiliser system
Cpp system
Steering system

96
Q

Drain leg is

A

Used for cooling and to return to the tank

97
Q

TDS stands for

A

Total dissolved solids

98
Q

TDS of sea water is at around

A

34000

99
Q

Chlorine levels are kept at what and who supervises it

A

0.2ppm and section head

100
Q

What ppm goes to the made water tank

A

350

101
Q

Permeate and made water are made through what filter

A

Membrane

102
Q

How to control calorifier

A

Thermostat
Pressure gauge
Pressure relief valve

103
Q

A run down valve does what

A

Allows you to drain calorifier for maintenance

104
Q

3 filters

A

Pre particulate-paper,coarse particle
Particulate-glass,bacteria,holds onto it
Gas filter-warfare chemicals,charcoal

Mech 4 RN (1 decks)

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