Auxiliary Machinery. Test 84 – Online Maritime Tests

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 _____

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

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

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

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

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

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

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

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.
contain sufficient oil to maintain level during your watch.

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

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

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