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Auxiliary Machinery. Test 56

Online Maritime Tests > Tests > Auxiliary Machinery. Test 56

Auxiliary Machinery. Test 56

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After sometime, scale build-up is unavoidable in steam generating coils. How is it removed ?

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In the drydock by chemical engineers.
By cleaning with boiler tube brushes.
Bythe circulation of chemicals by small pump in port.
By flushing with the boiler water circulation pump.

This installation consists of the following turbine combination :

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a turbine system with ahead and astern manoevring capability.
the H.P and L.P turbine acting in tandem to one reduction gear.
All of these.
a high pressure and a low pressure turbine.

What type of boilers are fitted (one only shown) to feed this turbine installation ?

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Cochran type boilers.
Water tube boilers.
Exhaust dissipation boilers.
Scotch type boilers.

Why is it necessary to produce fresh water from seawater?

To make use of waste engine heat.
To ensure purity.
Limited shipboard storage.
To save cost.

Of what is this finned pipe a part ?

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Of any of the other options.
Of an exhaust gas boiler economiser.
Of an exhaust gas boiler superheater.
Of an exhaust gas boiler steam generator.

If the flapper is pushed against the nozzle so that h = 0, what will the reading of NBP become ?

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0 psi.
20 psi.
3 psi.
15 psi.

Why is steam allowed to position - J' - of the turbine 'J ' ?

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It is the steam gland feeder line.
It is the steam regenerating line.
It is the steam to the astern turbine.
It is the parallel reduced steam line.

Why are components 'S' required ?

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To enable maximum fuel efficiency of the turbine installation.
To absorb the vibrations on the propeller.
To reduce high turbine speed to propeller speed.
To transform rotating power into axial power.

What factors influence the vacuum inside the shell of a fresh water generator?

The temperature of the fresh water heating the evaporator.
All of the given options.
The temperature of the sea water cooling the condenser.
The pressure of the ejector water on the vacuum ejector.

What are items 'R' and why are they required ?

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Coupling flanges. To allow disassemble of pinion gears.
Reducing block bearings. As turbine shaft support.
Thrust bearings. To catch axial force and propel the ship.
Flexible couplings. To allow flexibility between HP and LP turbines.

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