Auxiliary Machinery. Test 55

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

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

In a hydraulic telemotor steering system movement of the wheel _____

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

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

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

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

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 change over from main to forward stern tube sealing circuit.
To fill oil in the system.

Review Answers

Auxiliary Machinery. Test 55

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