Brainscape's Knowledge GenomeTM

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


See full index

Theory 2 > Varnham 2 > Flashcards

Varnham 2 Flashcards

1
Q

State 4 method of embarking fuel when along side

A

Road bowser

Direct jetty pipe line

Jetty storage tanks

Barge

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

Why are fuel tanks positioned at the lowest part of the ship

A

To keep the ship less buoyant and maintain the balance of the ship so that it doesn’t capsize

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

What is the purpose of the fuel tank filling valves

A

The purpose of the filling valves is to control the level in the tank

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

How does centrifuge pump separate fuel from water

A

Centrifugal pump spins at 5000RPM
Spraying the heavy substance which is the water further away
This separates the water from the fuel

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

What percentage are the undisplaced tanks filled to

A

90%

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

What is the purpose of the coalescer and to what level

A

The device is fitted to remove water droplets down to 10ppm that may be in the fuel

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

Purpose of the fuel pre filters and to what level

A

To remove any fine particals of dirt down to 5 microns

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

What materials may the filters be made from

A

Yarn, paper, felt, wool

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

How is the ready use tank level maintained

A

Fuel fills up the tank pushing up the float valve when it get the the designated level, causing the flap valve to open. When the fuel decreases the flap favs goes back down

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

What is MBG and where would it be found

A

Micro biological growth and can be found in contaminated diesel

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

State 4 fuel tests briefly and explain

A

Visual test-fuel must be clear and bright with no obvious signs of dirt, sludge,water
Water reaction test-water reaction 20 ml of water added 80 ml of fuel is left to set see if more water builds up
Colour test-fuel will become darker as old it gets and is compared to colour slides
Diesel fuel filtration test kit-passing a sample through a filter monitoring how quickly filter becomes blocked

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

What are hazards associated with fuel

A

Fire and explosion

Toxcity

Dermatitis

Pollution

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

What does CODLAG stand for

A

Combination of diesel electric and gas

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

What type of gas turbine is fitted to a type 23 and how many

A

2 speys

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

What are the advantages of a gas turbine fitted to an RN ship

A 
Am ability get underway quickly
High weight ratio/power
Minion ship board maintenance 
Low manpower requirement 
Ease of operation with the emphasis on remote contoll
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Fully explain 3 stage filter

A

Water eliminator removes water droplets and any water from the air.

Knit mesh filter removed any dirt and any fine particles

Last water eliminator removes any water left in the air .

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

Explain the splitter silencer

A

Unit consists of perforated vanes filled with sound absorbing material that smooths out air flow removing any turbulence and noise

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

Explain the transition duct

A

The transition duct provides a smooth change from a square cross sectioned air flow to a circular cross sectioned air flow without creating any turbulence

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Explain the cascade bend

A

The cascade bend directs airs through a 90 degree bend without causing any turbulence to the ready smoothed out air flow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Explain engine intake flare

A

Engine intake flare seals the engine intake from the rest of the module and houses the water wash ring

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

Fully explain how the module ventilation systems works

A

The depression of air is formed by the rushing exhaust gasses due to Bernoulli’s Therom

Air is drawn into the module because of the depression formed at the other end

Air circulates around module keeping it cool

Vent flaps must always be open

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

How compresses driven

A

Compresses are driven by their respective turbines

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

Purpose of the power turbine

A

The power turbine directly drives the input shaft of the gearbox which in turn drives the propellor shaft

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What is reason for mag chips, where are they fitted, how often are they checked

A

Mag chips are fitted into a scavenge oil system
Collect bits of ferrous metal that have broken away from the engine . Give an early indication of wear/ malfunction

Inspected every 24 hours of the running has turbine

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

What oil is used in Spey gas turbine

A

OX22

26
Q

State 6 safety devices fitted to a has turbine

A 
Hand trip
Fire detectors
Power turbine entry temperature 
Partial overspend safety device 
Vibration monitor 
Power turbine over speed
27
Q

Explain partial over speed trip

A

If the engine over speeds the propeller comes out the water, this device reduces the quantity of fuel supplied to reduce the engines speed

28
Q

Hazards associated with gas turbines

A

Igniters

Noise

29
Q

Precautions must be adhered to when with working with igniters

A

Produce sparks voltage excess 2000 v,

After use igniters and associated circuitry must not be touched for at least 5 minutes to allow stored electrical energy to discharge

30
Q

What fire system is fitted to gas turbine module

A

Fire detector

31
Q

What checks are performed every hour on a running gas turbine

A

Pressures+temperatures
Oil levels
Noise+vibration
Leaks

32
Q

Explain wet motoring

A

Wet motoring is carried out after maintenance has been undertaken on the engine fuel system, to confirm its operation and to vent off any air from the system.

33
Q

Explain dry motoring

A

To purge the combustion chamber of any unburnt fuel and explosive gasses

To turn over compressors to enable washing and inhibiting routines to be carried out

34
Q

How do we inhibit them components of gas tubing against corrosion when not in use

A

Spray PX24 into the engine to disperse the moisture and to coat and protect the internal parts of the engine

35
Q

What are the main functions of a gearbox

A

Transmit power from prime mover to shaft
Allow for variation in speed and power
Allow for changed between ahead and astern thrust

36
Q

What are the main components of a gear box

A

Pnions
Wheels
Quill shaft
Casings

37
Q

How do you change speed of a gear train

A

Add a differnt size gear

38
Q

State 4 type of gear profile

A

Straight spur gear
Helical gear
Double helical gear
Worm gear

39
Q

Explain the construction and advantages of double helical gear

A

The double helical gear are opposing angled teeth form a V

The advantage of this is that it produces thrust in both direction cancelling out the thrust

40
Q

Explain the construction and advantage of a worm gear

A

Work gear resembling a screw with continuous tooth forming parallel helical teeth

Advantage that can join shafts together that are 90 degrees at each other

41
Q

State the three methods of gear reduction

A

Single gear reduction

Double gear reduction

Double gear reduction duel tandem

42
Q

Explain the purpose of the quill shaft

A

Quill shaft acts as a torsional spring, twisting along its length .by having the ability to move load can be evenly distributed and any misalignment can be compensated for

43
Q

What checks are carried out when applying break pads

A

Ensure no risk exists

All break pads are applied

The shaft is stationary

44
Q

Break checks on removal of break

A

All pads are clear

No fire danger exists

The shaft is turning

45
Q

Purpose of the thrust block

A

The purpose of the thrust block is to absorb forces from the action of the propellor and transmit it to the ships hull

46
Q

Purpose of the turning gear

A

Slowly rotate the shaft and propellor for docking

47
Q

Purpose of the Plummer block

A

The ship Plummer block are use to support the weigh of the shaft without absorbing any thrust

48
Q

Purpose bulkhead gland seal

A

Bulkhead gland seal purpose it to maintain water tight integrity as the shaft passes through compartments

49
Q

Purpose of the stern seal

A

The stern seal is to maintain water tight integrity as the shaft passes through the ships hull

50
Q

Purpose of A bracket

A

The purpose of the A brackets are to support the weight of the propellor shaft

51
Q

What principle does a plummer block use for lubrication

A

Michaels principle

52
Q

What substance does a bulkhead gland seal use

A

Grease

53
Q

What is fitted to a stern seal in the event of an emergency

A

Emergency inflation seal

54
Q

What do A brackets use for lubricantion

A

Sea water

55
Q

What are the three sections of the shaft line

A

Thrust shaft, intermediate shaft, tail shaft

56
Q

How are the thrust shaft and intermediate shafts connected

A

Flanges with a ring of nuts and bolts

57
Q

How are intermediate and tail section connected

A

SKF coupling
The intermediate shaft and tail shaft are connected by SKF coupling which is a hydraulic coupling and is designed so that the tail shaft can be split from the intermediate shaft without leaving the flange

58
Q

What are the two type of propellor

A

Fixed propellor

Control pitch propellor

59
Q

How is the gearbox kept at the correct temperature

A

Serkstat

60
Q

Purpose of the FL cut in

A

Check cut in pressure of the motor driven pump should the gear driven pump fail

Theory 2 (1 decks)

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