Auxiliary Machinery. Test 62 – Online Maritime Tests

What is the function of the dehydrator in a refrigeration system ?

To reduce moisture in the compressor house.
To take away humid sediments in the suction valve.
To absorb moisture usually present in the refrigerant.
To reduce risk of corrosion in the brine tank.

The working pressures used by pneumatic control components are between 3 and 15 psi. What are the equivalent currents used by electric control equipment ?

Between 0 and 20 mA or 4 and 20 mA.
Between 10 and 50 mA or 15 and 50 MA.
Between 20 and 60 mA or 25 and 75 mA.
Between 0 and 5 or 3 and 9 mA.

When would both steering gear motors be run together?

When at anchor in a confined anchorage.
When manoeuvring in confined areas.
In the tropics to overcome the lowering of the oil viscosity.
When on passage to minimise wear.

When taking over the engine room watch, what should you check concerning the operational heavy fuel oil purifier?

The water seal (tank), the crankcase oil level ,the flow-through capacity, the fuel inlet temperature, the overflow pipe and the back pressure.
The Ferodo coupling, the bearing temperature, the crankcase oil level, the pump bearing temperature and the setting of the timers.
The attached fuel pump bearings, the fuel back pressure, the inlet temperature and the suction strainer.
The flow-through capacity, the temperature on the inlet, the bearing temperature and the Ferodo coupling.

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