Auxiliary Machinery. Test 55 – Online Maritime Tests

Which are the stern tube bearing parts on this type of stern tube?

The cylindrical steel tube with white metal lining and oil supply system.
The forward and the aft bearing bushes (liners).
The forward and aft plummer blocks.
The cylindrical steel tube aft.

What is the purpose of the double check valves fitted in this telemotor system ?

To avoid oil blockage and stickiness.
To maintain the set pressure in the system.
To avoid pipe rupture due to sudden movements.
To keep the rudder locked in the desired position.

What is the purpose of the 3-way cock part No. 7 in the stern tube oil circuit ?

To remove air from the system.
To drain the oil from the stern tube and sample.
To fill oil in the system.
To change over from main to forward stern tube sealing circuit.

If the suction and delivery valves are closed for test and the compressor is losing gas pressure rapidly (indicating a leak), which part would you suspect first?

The flanged pipe gauge connections.
The valve plate gaskets.
The shaft seal (item No 7).
The crankcase door gasket (fitted on block No 1).

In a hydraulic telemotor steering system movement of the wheel _____

controls movement of the transmitter electric motor.
controls the main hydraulic pumps.
controls movement of the transmitter pistons.
transmits electrical signal to the hydraulic actuator valves.

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