General Flashcards
Q1
Explain the actions that the Engineer Officer of the Watch should take on discovering the lagging on the main engine exhaust, within the funnel spaces, was on fire. (16)
Action to be taken by OOW upon discoverig fire in main engine exhaust tunnel and lagging:
Raise the nearest fire alarm call point.
Inform the chief engineer, bridge and inform them of the situation.
Request that the engine is stopped, once stopped turn off auxiliary blowers, fuel supply and ER fans closing all flaps also.
Start the emergency generator and fire pump, set up fire hoses around the area and start boundary cooling on outside areas.
Block all turbocharger air inlets, and remove lagging.
Using flood quantities of water to cool the area and attack the fire.
Start emergency bilge if levels increase beyond that of the bilge pump.
Q2
Describe, with the aid of sketches, the principle of centrifugal separation as used in fuel and lubricating oil purifiers (16)
Q3
(a) List the THREE types of Notice issued by the Maritime and Coastguard Agency (MCA) to disseminate information to ship-owners and seafarers (6)
(b) Define the relevance and importance of each of the Notices stated in (a) (10)
(a) THREE types of notices issued by the Maritime and Coastguard Agency to discriminate information to ship-owners and seafarers are
Merchant Shipping Notices (MSNs)
Marine Guidance Notes (MGNs);
Marine Information Notes (MINs).
(b) MSNs – Convey mandatory information that must be complied with under UK legislation. These MSNs relate to Statutory Instruments and contain the technical detail of such regulations.
MGNs – Gives significant advice and guidance leading to the importance of the safety of shipping and life at sea and to prevent or minimize pollution from shipping.
MINs – Marine Information Notes are intended for a more limited audience e.g. training establishments or equipment manufacturers, or contain information that will only be of use for a short period, such as timetables for MCA examinations.
Q4
With reference to a vapour compression refrigeration cycle, describe TWO main symptoms of and remedies for EACH of the following:
(a) undercharge (4)
(b) overcharge (4)
(c) air in the system (4)
(d) moisture in the system (4)
a) Undercharging of Refrigeration System
The compressor is running hot, and the performance of the compressor falls off due to the high superheat temperature at the suction side of the compressor.
The suction and discharge pressure of the compressor is low.
Large vapour bubbles in the liquid sight glass.
Low gauge readings in the condenser.
The ammeter reading for the compressor motor is lower than normal.
Rise in room temperature, which is to be cooled.
Compressor Is running for an extended period.
(b) Overcharge of Refrigeration System
The liquid level in the condenser is too high (high condenser gauge reading). This will reduce the available condensing surface, with a corresponding increase in the Saturation temperature and pressure.
The high-pressure switch of the refrigerant compressor activates and stops the compressor.
The suction and the discharge pressures are high.
(c) Air in the system:
This may cause the refrigeration compressor to overheat, with a high discharge pressure and normal condensing temperature.
There are possibilities of small air bubbles in the liquid sight glass of the condenser.
The condensing pressure of the refrigerant in the condenser may be high.
If there is excessive air, it may reduce the cooling capacity of the system, making the compressor run for an extended period of time.
It may cause the gauge pointer of the condenser to jump indefinitely.
(d) Moisture in the System:
This normally comes with the ingress of air in the system. Moisture may freeze at the expansion valve, giving some indication of undercharging.
It will contribute to the corrosion in the system.
It may cause lubrication problems and breakdown of the lubricating oil in the refrigerant compressor
Q5
(a) Explain the importance of regular fire drills (8)
(b) Describe how a drill relating to a fire in a purifier room may be organised. (8)
a) Fire drills can reduce panic and take pressure off in the event of a real-life emergency by teaching crew members what their duties are and how they can be safely executed.
All personnel will be familiar with the location and operation of fire fighting equipment reducing the likelihood of panic.
Fire drills ensure:
everyone knows their role
To check and test equipment e.g. breathing apparatus
That everyone knows how to use the equipment
Regular discharge of fire extinguishers
Reduce complacency
(b) Drill relating to a fire in a purifier room
Agree on the location before the drill
Sound the alarm and once mustered inform the crew
Close access to the purifier platform
Close Quick Closing Valves
Close ventilation to the purifier room
Activate fixed fire fighting equipment, for example, high fog and use the drill as an opportunity to carry out the routine test
Have the fire teams set up for boundary cooling
