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Theory 4 > Theory 4 > Flashcards

Theory 4 Flashcards

1
Q

Explain the pressure volume relationship and it’s effect on boiling point

A

The higher the pressure the lower the boiling point

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2
Q

Explain heat transfer

A

Heat always transfers from hot to cold

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3
Q

Explain latent heat

A

Latent heat refers to a constant temperature required to changing the state of a substance

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4
Q

Explain sensible heat

A

Sensible heat is applied to heat a substance whilst still remaining the same state

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5
Q

Explain super heat

A

Super heat is maintaining a temperature above a substances boiling point

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6
Q

What are the hydraulic rings made from, what temperature do they retain their elastic properties and what happens if they burn

A

O-rings made from fluorocarbon elastomers retains properties Untill 300 degrees at which point they give off toxic gases called hydrogen fluoride

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7
Q

What are the two categories oh hydraulic cell

A

Petrolium based abs synthetic based

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8
Q

What type of oil is used on, stating number and why?

A

Submarines:OX30-red-synthetic

Type 23 and type 45: OX40-green-synthetic

Type 22, type 42 and cvs:yellow/orange-petrolium

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9
Q

What are the desirables properties of hydraulic cell

A

Flow easily through lines
Practically incompressible
Lubricating
Cooling

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10
Q

What does demusibility mean

A

Ability of a fluid to separate out from water

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11
Q

Why are anti oxidants added to oil

A

Reduces likely hood of sludge/gum occurring in the oil

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12
Q

List 6 hydraulic pumps that are commonly used

A 
External gear type pump 
Internal gear type pump 
Vane pump 
Love pump
Piston type pump(single)
Piston/plunger type pump(multi)
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13
Q

Briefly explain axial piston pump operation

A

Cylinder 1, plunger at highest point, no axial movement suction and delivery valve shut

Cylinder 2, plunger on inlet stroke,suction valve just opening,delivery valve shut

Cylinder 3, plunger near end of inlet stroke,suction valve closing ,delivery valve shut

Cylinder 4, plunger starting delivery stroke, suction valve shut,delivery valve just opening

Cylinder 5, plunger at maximum part of delivery stroke, suction valve shut, delivery valve fully open

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14
Q

What does an actuator do and what types are available

A

Covert energy(system pressure) into mechanical motion

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15
Q

What is the purpose oil drain leg

A

Allows oil that’s been specifically used for cooling sealing the acuator/motor to return to the tank

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16
Q

What are the advantages of a hydraulic system over an electric system

A 
Reliable 
Simple/easy to understand 
Infinite speed range
Easily reversed 
Ability to withstand overload
No spank risk 
High torque at low speed 
1/12 size of electric motor
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17
Q

Use of fresh water on board

A

Drinking, washing,cooking,cleaning

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18
Q

Briefly explain reverse osmosis

A

The transfer of water from salt water through a semi perable membrane into pure water, creating fresh water

19
Q

What TDS and what does it measure

A

Total dissolved solids and it is measures the purity of the water

20
Q

What is the TDS levels in concentrate, sea water permeate

A

Concentrate 56,000ppm
Sea water 34,000ppm
Permeate 250-300ppm

21
Q

How much salt water is rejected

A

80% salt water rejected

22
Q

What how of filters are fitted in an RO plant and what level do they filter to

A

Pre filters down to 50 microns

23
Q

Briefly explain the RO plant pump

A

It’s a HP pump which operates at 10-65 bar. It’s a positive displacement pump three cylinder position type. Incline pulsation dampeners are fitted to smoothen out suction pulsations

24
Q

Briefly explain the CCV function

A

CCV are fitted to the discharge lines and when closed down, they increase back pressure, ensuring the salt water pump is pushed through the membrane, allowing for osmosis to take place. A flow meter indicates the produced permeate

25
Q

How is the scaling of membranes prevented

A

Using an anti-scalent dosing unit

26
Q

Briefly explain the along side procedures for bringing fresh water on board

A

Get FW hose and connection from stores

Unscrew deck cap to the filling connection

Fit filling goose neck to filling connection

Fit hoses to shore supply

Open shore supply valve and flush hoses

Water tests

Shut shore supply valves

Fit hoses to deck filling goose neck

Dip and record tank levels

Open tank filling valve

Open shore supply valve

Open ships main FW isolating valve

Regular check tank levels

Regularly water tests

27
Q

What is the chlorine limit

A

0.2 ppm

28
Q

How often is water tested for chlorine levels

A

Daily

29
Q

What tests are performed on on fresh water

A

Visual, taste, CHEM ets

30
Q

How is water heated onboard

A

Calorifiers

31
Q

What is air hammer and how can it be eliminated

A

This is a loud banging noise in the pipes caused by trapped air. It can be eliminated via a air eliminator

32
Q

When will phosgene gas be created

A

If CFC refrigerants are exposed to a high heat sore

33
Q

What is given off fruit and veg decomposes

A

Co2

34
Q

What is the procedure of entering the refrigerant compartment

A

No smoking and control hot work

Inform rating in charge of watch

High and low exhaust fans are on

IRLDS work

Breathing aparetus available

Trapped warning lamp works

Accompanied by safety number

Doors work

35
Q

What should you do if you get refrigerant in yours eyes

A

Don’t rub eyes, wash eyes and open and close eyes

36
Q

What systems are supplied witch chilled water

A

CBRN, cooling electrical equipment, habitability, cooling machinery space

37
Q

What is the main difference between a refrigeration and chilled water system

A

Fan supply and fan exhaust- fitted where large quantities of wild heat moisture or noxious fumes coupled with requirements to provide fresh air to personal in compartments

38
Q

What provides cooling for the condenser and motors

A

Panel filters, supply filters, grease filter, lint filters, dust filters

39
Q

State 4 uses of ventilation

A

Galleys, auxiliary machinery space, magazines, paint stores

40
Q

Condenser purpose

A

Uses sea water to cool the refrigerant changing its state from a gas into a liquid

41
Q

TEV purpose

A

Controls the flow of refrigerant through the system increasing or decreasing the flow depending on the temperature of the refrigerant leaving the evaporator

42
Q

Evaporator purpose

A

The refrigerant flowing through the evaporator removes heat fr the refrigerator/cold room. This action changes the state of the refrigerant from a liquid into a gas

43
Q

What does a compressor do

A

Pumps refrigerant around a system at high pressure

Theory 4 (1 decks)

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