Engine Lub Oil is recycled from M/E into L/O drain tank and

Recycled through the use of strainer, pump and cooler for reuse

4 stroke engines are used more commonly in:

Tugboat, Car, Motorcycles, Life boat

How is electricity produced?

It is produced through magnetism (magnetic flux) and work done

Aft Seal’s purpose is to

Stop sea water from flowing in and prevent Lub oil from leaking out

A basic refrigeration cycle is

Compressor, Condenser, Expansion Valve and Evaporator

Main switchboard feeds the emergency switchboard. When the emergency switchboard does not detect the feed from MSB,

Emergency Gen starts immediately and it will feed the emergency switchboard

Working principle of a Reaction turbine is

Turbine blades are nozzles. Steam comes out of the nozzle and turn

How does a Diesel engine start?

It is started by compressed air

Why do we need to give treatment to water boiled from Fresh Water Generator

Some bacteria not killed at lower boiling point of S/W in FW Gen

DC unit produces a steady rate with little fluctuations. This results in a

Better Speed Control and High Starting torque

Suction Side Cavitation is caused by

Restriction on Suction Side of pump resulting not enough fluid can enter

Vanel Screw Pump operates by

Catching Fluids in a screw and transporting it

One can recognise cavitation by

By a sharp pinging noise in the pump

Rust on hull occurs because

Water and ship hull got different electric potentials

studbud

Marine Plant and Propulsion MST 2020

100 termsStudBud Administration119 plays

Marine Plant and propulsion MST prep questions

Flashcards100 cardsFPractice quizPHost liveL

Questions 100

Answers

1
Two types of steam turbines are
Jet and impact turbine
Impulse and reaction turbine
Blade turbine and Jet turbine
Steam and Gas Turbine
2
Engine Lub Oil is recycled from M/E into L/O drain tank and
Recycled through the use of strainer, pump and cooler for reuse
Recycles automatically as it is a closed feed system
Kept in settling tank for discharge as it is not reusable
3
Chemical treatments are allowed onboard as chemicals can be purified before discharging into the sea
False
True
4
Distance moved by one complete turn of the propeller is called
Propeller efficiency
Propeller Pitch
Propeller Slip
All of the above
5
Chemical name of rust formed from oxygen in the water and the hull is called Ferric Hydroxide
True
False
6
Propeller does not achieve its specified distance at one revolution and it is called
None of the above
Propeller Pitch
Propeller Slip
Propeller Efficiency
7
Controllable Pitch Propellers
Can adjust the pitch but can rotate only in one direction
By controlling pitch can create reverse thrust
All of the above
Maximise the propeller thrust
8
4 stroke engines are used more commonly in:
Ship main engine, Tugboat, Life boat
All of the above
Jet engines and sports cars
Tugboat, Car, Motorcycles, Life boat
9
Steam turbines uses that steam energy can only turn propellers but not generators
True
False
10
How is electricity produced?
All of the above
It is produced when a current passes through a wire
It is produced when Magnets comes into contact with one another
It is produced through magnetism (magnetic flux) and work done
11
A centrifugal Pump is a high volume pump due to positively displacing fluid and self priming feature
True
False
12
Cavitation is due to residue and corrosion on impeller/propeller
False
True
13
Alternate current (AC) is not as efficient as Direct Current (DC)
False
True
14
Aeration compartment is where bacteria breaks down and converts sewage into sludge
False
True
15
Aft Seal’s purpose is to
Prevent stea water from flowing in
Prevent Lub oil inside stern tube from leaking out
Stop sea water from flowing in and prevent Lub oil from leaking out
To prevent the loss of propeller
16
A basic refrigeration cycle is
Condenser, compressor, evaporator and expansion valve
Compressor,Condenser,Evaporator and expansion Valve
condenser, Compressor, expansion valve and Evaporator
Compressor, Condenser, Expansion Valve and Evaporator
17
Acid cells and Alkaline cells can be stored together as there are no chemical reactions between them
False
True
18
Main switchboard feeds the emergency switchboard. When the emergency switchboard does not detect the feed from MSB,
The synchronisation switch board double checks if there is a blackout
It reroutes the detection of feed to an alternate source
It checks both 220 and 440 panels first
Emergency Gen starts immediately and it will feed the emergency switchboard
19
To know the foaming or priming of boiler, Engineers can check visually
True
False
20
To reverse an engine, the engine need not come to a full stop first
True
False
21
Working principle of a Reaction turbine is
Steam hits the blade and causes the turbine to turn
Due to chemical reaction between turbine and steam
Turbine blades are nozzles. Steam comes out of the nozzle and turn
Reacts to the steam hitting its turbines and turn
22
If the fuel and air in the combustion chamber is not proportionate, it results in poor combustion
True
False
23
When a wire is moved in a magnetic flux, electricity is induced in the wire
False
True
24
Some qualities of a refrigerant are
Smaller vapour density so can use on smaller compressors
Non flammable high heat absorption refrigerant that does not mix with oil
Low toxicity and Low cost
All of the above
25
Storage batteries last for 30mins + 12% of rated voltage without recharging
False
True
26
The name of the oxygen loving bacteria is called Aerobic
True
False
27
Sewage is broken down into an acceptable substance and bacteria is killed off in chlorination compartment
True
False
28
Flume Stabilisation uses water level in tanks to reduce roll
False
True
29
Warming of the turbine must be done gradually or it will crack and damage the turbine. The process is:
All of the above
Let steam bleed through drain valves to control the temperature
Remove air when needed
Apply lub oil for gears
30
Lead Acid Batteries cannot be recharged if they are partially used only
True
False
31
A positive displacement pump is a high pressure pump and it is self priming
False
True
32
An automatic device to stop the flow of electricity is called
A fuse
Change over switch
A safety switch
Emergency stop switch
33
What is the purpose of a rectifier?
It magnetises the metal when current passes through
It rectifies any current discrepancies
None of the above
It converts AC to DC current
34
How does a Diesel engine start?
Fuel injected for combustion which moves the piston
It is started by compressed air
Started by applying hydraulic movement from a diesel generator
Not sure
35
A Centrifugal Pump, due to its propeller/impeller rotation
Used in high volume areas where a rapid fluid transfer is needed
Not self priming
All of the above
High volume pump but Low pressure
36
Why do we need to give treatment to water boiled from Fresh Water Generator
Since bacteria not killed as SW bacteria needs special treatment
Some bacteria not killed at lower pressure inside F/W Gen
Some bacteria not killed at lower boiling point of S/W in FW Gen
All of the above
37
Injector is used when the compressed air and heat is enough to cause a combustion in the cylinder
True
False
38
An example of a positive displacement pump is a
Wilden pump
None of the above
Syringe
Submersible pump
39
DC unit produces a steady rate with little fluctuations. This results in a
All of the above
Better Speed Control and High Starting torque
More efficient
Low Line loss
40
A distillation process separates the components of a liquid by boiling
False
True
41
Fire tube boiler has heat inside the tubes
True
False
42
Treatment of Freshwater includes
Charcoal Treatment
Katadyne
Chlorination and UV lights
All of the above
43
The working principle of a sewage treatment plant is to use bacteria to completely break down sewage
True
False
44
Suction Side Cavitation is caused by
None of the above
Restriction on Dschg Side, constricting the flow out of the pump
Due to the restriction from the corrosion of the impeller/propeller
Restriction on Suction Side of pump resulting not enough fluid can enter
45
Stabilisers are fins extended from the ships hull to reduce roll by counteracting the roll but increases the drag
True
False
46
4 Stroke Engine is more powerful because it consists a higher number of strokes
False
True
47
Vanel Screw Pump operates by
Uses a motor to operate
Using Gears and displacing water
Uses a vacuum to displace fluid
Catching Fluids in a screw and transporting it
48
One can recognise cavitation by
By a sharp pinging noise in the pump
Pump will give alarm
Checking the cavities visually
By the irregular sound of the motor
49
The two types sewage treatments are
Not sure
Chemical and Biological
Chemical and Bacterial
Bacterial and Osmosis
50
Rust on hull occurs because
Not sure
Because of the marine life in the water causes the hull to rust
Water contacts with metal will make it rust
Water and ship hull got different electric potentials
51
Settlement compartment is where activated sludge is settled out and recycled to aeration tank to repeat the process
False
True
52
The principle of a turbo charger is
Turbine turns the compressor that compresses air
All of the above
Compressed air goes into the engine, balance exhaust gas goes into boiler
Waste heat (exhaust) is recycled to turn the turbine in the turbo charger
53
Emergency Generator is fitted with what functions
Auto Start Function
All of the above
Is fitted above deck as a flooding precaution
Supplies to Critical Equipment only, serving primary needs of the ship
54
One of the issues of OWS is that
It does not work as well as intended to
Oil and water bonding together
Some oil does not float
All of the above
55
A water tube boiler have water inside the tubes
True
False
56
IF alkaline Batteries are fully discharged, they can only be recharged a few dozen cycles.
True
False
57
A domestic Fresh Water Generator is used for bathing only but not for drinking and galley use
False
True
58
Exhaust gas is recycled in an exhaust gas boiler is at least
300 degrees
3000 degrees
400 degrees
4000 degrees
59
Dschg Side Cavitation is caused by
None of the above
Due to the corrosion of propeller/impeller
Restriction on Suction Side of pump, resulting not enough fluid can enter
Restriction on Dschg Side, constricting the flow out of the pump
60
Spark Plug is used when the fuel cannot combust itself.
False
True
61
Precautions for a Controllable Pitch Propellers are
All of the above
Oil Leakages affect the hydraulics for pitch so they are closely monitored
Maintain the oil level and pressure for hydraulic oil
Pitch must be set to zero (local and remote) when’s starting
62
The two types of turbines are
Steam and Gas
Steam and water turbine
Not sure
Turbo Charger and Gas turbine
63
IMO Requirement for rudder 35 to 30 is not more than 26s
False
True
64
Working principle of an impulse turbine is
Works when steam hits the blade, causing it to turn
The blade is a nozzle. Steam comes out of the nozzle and turns
Open feed turbine with steam collected in hot well
Closed circuit turbine not exposed to open air
65
The change over of Remote steering and Local steering and vice versa, must happen within how many seconds?
5s
8s
3s
2s
66
More fuel is required to be injected for more engine power. Therefore, more air is also required to match the fuel ratio
False
True
67
In a Fresh Water generator, Sea Water boiling point is reduced by
None of the above
Reducing the Salt Content
Reducing the quantity of water
Reducing the pressure
68
There are two seals in a stern tube. They are
None of the above
Forward seal and Aft Seal
Not sure
Pilgrim Nut and epoxy seal
69
Main Engine speed depends on
Mean Pitch
All of the above
Slip Percentage
RPM
70
Emergency Steering Drills are held every 6 months
False
True
71
Scavenge fires are commonly caused by,
Accumulation of oil due to broken or worn piston ring
Exhaust Gas over heating
Lubricating grease spill over from grease nipple
Broken Piston Skirt
72
Failing a Net Positive Suction Head can result in cavitation. NPSH is caused by
All of the above
Boiling Point, pressure and temperature of fluid
Pipe Frictional Losses
Height of the Liquid
73
Head loss is where the energy of the electric motor suffers a loss due to frictional loss on the impeller/propeller.
False
True
74
The purpose of a blowdown valve in a boiler is to
Drain some boiler water to check salt content
To prime the boiler due to impurities
Blows down excess sludge, sediment or other chemicals
To prevent the obstruction of heat transfer
75
Engine is stopped by not supplying fuel into the injectors
True
False
76
A secondary refrigerant such as Brine is used on reefer ships to cool the cargo
True
False
77
A Closed feed system turbine in a steam ship requires a very big water tube boiler as it needs a lot of steam.
False
True
78
OWS is based on the principle that
The bigger the oil droplets, the faster it floats on TOP
All of the above
Oil is lighter than water and floats on TOP
OWS collects all small drops, combine to a big drop and separates
79
Transitional Source of Power is not achieved by the use of storage batteries
True
False
80
Lead Acid batteries can be recharged quickly even after draining TIL empty
False
True
81
Boilers can be heated up at any speed as they are already designed to compensate the pipe elongation and expansion
False
True
82
Fuel System consists of ; Settling tank -> Feed pump -> Heater ->purifier -> Service tank -> to Main Engine
True
False
83
Priming the boiler also known as Foaming in the boiler due is caused due to impurities in the water
True
False
84
The precautions in maintaining a lead acid battery are
Acid must be poured into water and not the other way around
Rust can occur at terminals so the user have to remove occasionally
All of the above
Hydrogen gas emitted so it is a fire hazard
85
Rust on Hull is protected by which method
Not sure
Electron protection method
Cathodic protection
Anodic protection
86
An AC unit uses 2 rings instead of a split ring like a DC unit. This results in
Higher efficiency and Low line loss
Better speed control and high starting torque
Steady power rate with little fluctuations
All of the above
87
A feed system generally consist of
A boiler, A turbine, A condenser and a Feed Pump
Both closed and open feed systems
All of the above
A boiler and a turbine only
88
Oil Discharge Monitor works by
Photoelectric sensor allows detection through electrons
Photocell detects through electrons
By light passing trough a Photocell
Photoelectric sensors detecting the oil
89
4 stroke engine operation cycle consists of
Down stroke, Up stroke, Power stroke, Exhaust Stroke
Suction, Compression, Power, Exhaust
Compression, Suction, Power, Exhaust
Suction, Compression, Power stroke, Relieve Stroke
90
Engine is reversed by
Fuel injection and other mechanisms follow suit in the reverse order
All of the above
Engines coming to a full stop first
Air distributors direct the pistons in the reverse order
91
Stroke that turns the propeller in 4 stroke engine
Compression
Power
Suction
Exhaust
92
Steam is reheated into Super heated steam , which has a lot of heat energy. This is used to run small turbines
True
False
93
For emergency preparedness, diagram for emergency steering must be listed in steering gear room and bridge
True
False
94
What are the 3 main compartments of a biological sewage plant?
Oxygenation Chamber, Bacterial Chamber and Chlorination Chamber
Bacterial Chamber, Aeration and Chlorination
Aeration, Settlement and Chlorination
Primary, Settlement and Chlorination
95
A mud hole of a boiler is used to
Remove the sediments at the bottom of the boiler
Connected to the steam drum for Super heating steam
To remove excess steam
Feed the boiler water into the drum
96
The features of a lead acid battery are
they are maintained at a charged state
Must not be fully charged or cannot recharge
All of the above
Not being able to fast charge
97
The remaining output of M/E in horse power after frictional losses (bearing, Waves, Resistances) is called
Propeller Speed
Propeller Pitch
Propeller Efficiency
Propeller Slip
98
Priming is a process where
A process where you fill up the pump completely with fluid
It is used in an educator system
Pump loses efficiency due to frictional losses
You create a vaccine in a pump
99
If alkaline batteries are only discharged around 25% they can be recharged for a few hundred cycles
True
False
100
Hand pumps can be used to exert the pressure manually in case of emergency or complete failure
True
False

Marine Plant and Propulsion MST 2020 Flashcards | StudBud