Auxiliary Machinery. Test 26 – Online Maritime Tests

Which statement is true?

The conventional cooling system requires less maintenance than other cooling system
To minimize the scale formation, the Sea Water outlet temperature should never exeed 80 C
To minimize the scale formation, the Sea Water outlet temperature should never exeed 50 C
Jacket and scavening air cooling are done by circulating Fresh Water in a closed circuit

If there is never any water in the lubricating oil, why must we add water to the self cleaning separator bowl

To clean the disc stack
To enable the transducer to get an accurate reference value
To keep the interface in correct position
To minimise oil losses and prevent the sludge getting too hard

If oil flows out of the bowl casing drain of a solids ejecting separator what is the most likely problem

Insufficient amount of bowl closing water
The flow rate is too high
The sludge tank is full
Oil has been fed to the separator before full speed

Cooling water expansion tank in a closed cooling water system is designed to maintain a constant head on the system and:

Provide an air cushion
Reduce temperature
Reduce water turbulence
Allow for increase in water volume

Feed check valves for main and auxilliary purposes are normally of the double shut off type, as shown in the diagram. What is the main function of the non-return valve?

To allow overhaul of the screw down valve when the non-return valve is shut and the boiler is steaming.
To increase the workload for staff when overhauling the boiler.
To prevent the steam and water in the boiler from discharging out by the feed line, if a feed line fracture or a joint in the line blows.
To allow fine tuning of feed water flow to the boiler.

Which statement is true?

When running in cold climates, both sea chests is closed to avoid to low temperature on Fresh Water
The purpose of the priming unit on centrifugal pumps is to evacuate the suction line if air is present
The electric motor will be overheated if the suction valve is fully open when starting a centrifugal pump
Never start a centrifugal pump with a closed delivery valve

Which statement is true?

The FW-HT is cooling the Fresh Water Generator
The FW-HT is cooling the Generators
The FW-HT is circulated in a closed system, cooling cylinder jackets on Main Engine and aux. Engines
The bottom sea chest is used when low temperature on Sea Water is required

Which statement is true?

When the ME is running, the Fresh Water enters the engine at the top and leaves the engine at the bottom
Normal temperature of the oil after the cooler is approx. 65 C.
Normal temperature of the lub oil after the cooler is approx. 45 C.
Minimum scavening air temperature is 60 C to avoid dewing in the scavening air cooler

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