- Describe how you would connect 2x 12v (100AmH) batteries in parallel.
What is the total voltage?
What is the AmH capacity?
The + and the + on each battery are connected.
The - and - on each battery are connected.
Voltage = 12v
AmH = 200
- Describe how you would connect 2x 12v (100 AmH) batteries in series.
What is the total voltage?
What is the AmH capacity?
Connect + of one battery to - of the other battery.
Voltage = 24v
AmH = 100
- Describe the cycle of events for a four stroke diesel engine and explain what happens in each stroke.
INDUCTION - Piston on down stroke. Air enters inlet valve.
COMPRESSION - Both valves shut.?Piston rises and air is compressed.
POWER - Fuel injected into cylinder and the heat of compressed air ignited the atomised fuel causing combustion and the piston moves down on the power stroke,
EXHAUST - Pistol rises and exhaust valve open allowing exhaust gases to leave the cylinder.
- Identify the components from 1 through 12 as shown in this diagram
- Flywheel
- Cylinder head
- Cylinder
- Connecting Rod
- Piston
- Crankshaft
- Valves
- Piston Rings
- Push Rod
- Camshaft
- Timing Gear
- Engine Block
- List in correct order the components of a fuel system on an inboard diesel engine from tank to injectors.
- Fuel tank
- Primary filter
- Fuel lift pump
- Secondary filter
- Fuel injector pump
- Fuel injectors
- Leak off return pipe,
- List the components of a typical cooling system for an inboard diesel engine from seacock to the overboard discharge.
- Seacock
- Strainer
- Pump
- Heat exchanger
- Non return valve
- Over board discharge
- List the components, in correct order, of a bilge pumping system on a commercial vessel.
- Bilge alarm
- Suction
- Strainer ( strum box)
- Non return valve
- Bilge manifold
- Bilge pump
- Non return valve
- Overboard discharge
- What acid is contained in lead acid battery electrolyte?
Sulphuric
- What gas is produced by charging lead acid batteries?
Hydrogen
- What is the total voltage when two 12 volt batteries are connected in parallel?
12 volts
- What is the total voltage when two 6 volt batteries are connected in series?
12 volts
- What precautions would you take during refuelling, in accordance with maritime industry standards, to prevent a fuel spillage?
- Set up fire prevention parameter
- Signage
- PPE
- Dip tank first
- Fill to 90%
- Have spill kit ready
- Have fire extinguisher ready ( foam)
- What signs would a diesel engine give if it was experiencing fuel problems?
- Slowing whilst underway
- Poor compression ( possible fuel injector issue)
- White smoke in the exhaust
- Low fuel economy
- Rough idle
- Vibrating or shaking engine
Describe the device in this photo.
A sea cock
The green colour identifies a raw or salt water intake valve used for engine cooling, for ballast or deck wash situations.
- Identify the silver device in this photo;
A shaft anode used for corrosion prevention
- What could be the reasons for an engine overheating?
Sea water issue:
- sea water rose plugged
- sea water strainer plugged
- sea water impeller faulty
- sea water inlet valve not fully opened.
Engine issue:
- Engine overload
- Engine runaway
Leakage issue:
- cooling water leaking
- oil leaking
Circulation issue
- thermostat stuck
- air in the system ( air lock)
- What type of fuse should be used to replace a broken or blown fuse?
A fuse of the value recommended in the manufacturer’s handbook.
- You are the coxswain of a fishing charter vessel on a fishing trip with 10 passengers on board. You are approximately 3nm to sea and the engine stops. Explain what actions you would take in this situation and what could be the cause of the problem.
ACTIONS
- keep calm, record current location
- account for all crew and passengers and ensure all have life jackets
- note surroundings, hazards and other vessels. If in imminent danger ( ie in a shipping lane or path of oncoming vessel , use air horn / VHF channel 16 to warn approaching vessels.
- Appoint a lookout
- Advise your home station
- Diagnose and correct the problem
- if unable to diagnose/correct the problem, arrange for a tow.
POSSIBLE CAUSES
- empty fuel tank
- fuel tank valve shut ( ie through vibration)
- water in the fuel
- clogged fuel filter
- faulty fuel lift pump
- fuel pump couplings have slipped altering timing
- engine room hatch and fire flaps closed (insufficient air)
- Your vessel fuel capacity is 2700 litres. At a speed of 7 knots you consume an average of 30 litres per hour. You wish to retain a minimum of 30% of fuel onboard.
What is the vessel’s range?
What is the vessels running time?
How much fuel will you need to take on board?
Range = 441 nm
Running time = 63 hours
Fuel required = 1890 litres.
- Your vessels fuel capacity is 3800 litres. At a speed of 7 knots you consume an average of 26 litres per hour. You wish to retain a minimum of 30% of fuel onboard at all times.
What is the vessel’s range?
What is the vessels running time?
How much fuel will you need to take on board?
Range = 716nm
Running time = 102 hours
Fuel required =2660 litres.
- Describe the device in this photo:
A bilge manifold.
A device to pump out from individual compartments using just 1 pump. It uses a multi purpose pump where sea water ( green) can be used to wash decks , or turn into a fire hose( red) , or pump from bilge ( black) compartments.
- In accordance with maritime industry fuel spill response, list the things you would do if a fuel spill occurred during refuelling.
- Stop refuelling.
- Contain the spill as much as possible.
- Take fire precautions.
- Advise authorities.
- Carry out on board clean up
- Fo not use dispersants unless advised by local authority.
- List the six categories of pollution prevention covered under MARPOL.
- Pollution by oil
- Pollution by noxious liquid substances in bulk.
- Pollution by harmful substances carried at sea in packaged form.
- Pollution by sewage from ships
- Pollution by garbage from ships
- Air pollution from ships.
