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Acu > Ac > Flashcards

Ac Flashcards

1
Q

Classes of submarine

A 
SS (K)
SSN
SSC
SSP
SSBN
SSAN
SSGN
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2
Q

SS (K)

A

Submersible Ship Killer

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3
Q

SSC

A

Submersible Ship Coastal

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4
Q

SSN

A

Submersible Ship Nuclear

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5
Q

SSBN

A

Submersible Ship Ballistic Nuclear

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6
Q

SSAN

A

Submersible Ship Auxiliary Nuclear

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7
Q

SSGN

A

Submersible Ship Guided Nuclear

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8
Q

SSP

A

Submersible Ship Propulsion (AIP)

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9
Q

Advantages of Nuclear

A

Range
Speed
Endurance

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10
Q

Disadvantages of nuclear

A

Constant noise sources

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11
Q

Advantages of diesel

A

Very quiet on batteries

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12
Q

Disadvantages of diesel

A

Must snort to recharge batteries

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13
Q

Seven propulsion modes

A 
TR Turbo Reduction
TE Turbo Electric
DD Diesel Direct
DR Diesel Reduction
DE Diesel electric
BE Battery Drive
AIP Air independent propulsion
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14
Q

Snorting system

A 
Page 5
Snort induction mast
Engine exhaust into sea
Crew compartment ventilation
Engine room air intake
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15
Q

Temperature change in velocity

A

For every 1 degree Celsius increase in temperature per 100 m of water the acoustic velocity will increase by 3 m/s

Warmer is faster

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16
Q

Pressure changes to velocity

A

As depth increases the pressure grows for every 100 m increase in depth the velocity will increase by 2 m/s

17
Q

Salinity

A

For every increase of 1 part per thousand the speed will increase by 1.1 m/s

18
Q

HALT

A

High
Away
Low
Towards

19
Q

Three layer Ocean model

A

Mixed Layer
Thermocline
Deep layer

Temperature X axis
Depth Y axis
Draw line

Page 8

20
Q

Ambient noise

A

Any noise within the ocean that is not target related

21
Q

Natural noise

A

Biological
Ice
Weather
Seismic

22
Q

Man made noise

A

Shipping noise
Seismic surveying
Drilling
Active transmission

23
Q

Choke point

A

Choke points are geographical features, above or below the surface of the sea that restrict the freedom of movement of a submarine.

English Channel
Straits of Gibraltar
Greenland island uk gaps

24
Q

4 bottoms in order of reflectivity

A

Sand
Rock
Ooze
Mud and silt

25
Q

SNELLS LAW

A

Simply explained as the HALT law rule which states that rays will attempt to retract away from high sound velocity and head towards lower sound velocity

26
Q

Ocean floor diagram

A 
Shelf
Slope
Rise
Abyssal plain
Deep tench
Seamounts - guyots and pinnacles
Mid Atlantic ridge
27
Q

4 dimensions of a Lofar gram

A

Colour (bearing)
Time
Frequency
Intensity

28
Q

Active sonar vs passive

A

Active - detects objects by transmitting sound and receiving an echo

Passive - sound received at a sensor produced from a source.

29
Q

Sound definition

A

The periodic variation in pressure, particle displacement or particle velocity in an elastic medium

30
Q

Reasons to surface

A

Emergency
Comms
Attack solutions
Recharge battery

31
Q

Frequency

A

Number of complete waves lengths in a second.

32
Q

Label Diesel engine

A

Make

Acu (2 decks)

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