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Auxiliary Machinery. Test 44

Online Maritime Tests > Tests > Auxiliary Machinery. Test 44

Auxiliary Machinery. Test 44

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What kind of metal must never be allowed to come in contact with Freon liquid or Freon gas and why ?

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Iron, it will be rapidly wasted by the Freon.
Chromium, it will overheat.
Aluminium, it dissolves in contact with Freon.
Copper, it has a harmful effect on the Freon.

What is the principle in which oil/water separation takes place in this cascade tank ?

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By separation frames.
By acceleration through chambers.
By directional change and centrifugal action in triple-action.
By acceleration and gravitation.

What is the function of the 'Boiler Firing Switch' fitted on the control panel of this boiler burner ?

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To fire the boiler on manual in emergency.
To change from stand-by to firing mode and fire-up the boiler.
To isolate the electric power to the control panel.
To open the fuel valve to the burner.

What is the most important item of maintenance required to ensure maximum efficiency of the accomodation air conditioning plant?

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Clean the sea water side of the condenser every 2 months.
Clean the central air conditioning fan unit intake suction filters.
Ensure always that there is sufficient Freon in the receiver.
Ensure the evaporator unit remains ice free.

What is the function of the oil differential pressure cut-out fitted between the manometer pipes of manometers 'P' and 'SM' ?

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As a low lub oil pressure cut-out.
As high temperature warning.
As warning/cut out due to oil foaming.
As temporary cut-out.

What damage could be caused to the boiler by raising steam too quickly?

Leaking tubes where expanded into the shell.
Excess soot deposits on cold tube surfaces.
Distortion of the shell due temperature differential.
Damage to furnace refractory.

What is the function of the high pressure cut-out fitted on the same manometer pipe as manometer 'DM' ?

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As electrical overload and alarm, auto reset.
As operational cut-out when condenser pressurised prolonged.
As safety cut-out with additional alarm function . Manual reset required.
As alarm device only.

What is the purpose of the restart button which you will find fitted to the control panel of this boiler's burner?

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To be pressed after flame failure.
To be pressed after low water cut-out.
To be pressed after restarting the feedwater pump.
To be pressed after the forced draught fan trips.

What is the function of the low pressure cut-out fitted on the same manometer line as manometer 'SM' ?

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As safety power tripping device. Solenoids 'S' will also close.
As safety shut-down device. Inspection and reset are required.
As alarm device only without shut-down function.
Purely as cut-in/cut-out device by low capacity. No reset required.

What action would you take if the boiler water Chloride readings are too high?

Drain and refill the feed water tank.
Add more chemical to the feed water.
Increase frequency of testing.
Blow down the boiler regularly until readings are acceptable.

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