Auxiliary Machinery. Test 84 – Online Maritime Tests

On the fresh water generator why is a baffle plate fitted between evaporator and condenser?

To cool the vapour.
To prevent carry over of brine.
To maintain the vacuum inside the shell.
To maintain the evaporator temperature.

When taking over the engine room watch, what should you check concerning the fresh water generator ?

The sea water feed supply pressure, the eductor pressure, the fresh water level in the collector and fresh water pump back pressure.
The difference between sea water inlet and outlet on the condenser and the fresh water inlet and outlet on the evaporator.
All of the operating parameters and the fresh water production in the last 4 hours.
The vacuum percentage and the sea water temperature.

If when you start up a purifier it does not come up to the desired revolutions, or it takes too long a time to come up to the required revolutions, you should change the _____

purifier ball bearings.
O-rings and seal set of the bowl.
friction pad linings.
gravity disc.

During start up of a purifier, how will you notice when the bowl has reached the required revolutions ?

The crankcase rotating indicator will turn fast.
The vibrations on the purifier will increase.
The purifier will make a humming noise.
The starting amperage will drop sharply to normal (1/3 to 1/4) from the starting current.

When taking over the engine room watch you should ensure that the stern tube oil gravity tanks _____

contain sufficient oil to maintain level during your watch.
contain oil to the correct level mark to ensure that there is no oil loss via the stern tube.
are changed-over from high to low or vice versa as required.
are at the required temperature and if hot, more water should be added to the stern tube.

During your watch you notice that the salinity of the fresh water produced by the fresh water generator has gone up together with the output. You notice too that sea water temperature has dropped. What should you do ?

Throttle the fresh water flow to the evaporator.
Throttle the sea water flow to the condenser.
Increase the opening on the vacuum breaking valve.
Increase the flow to the eductors.

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