Auxiliary Machinery. Test 85

If you find that the feed rate of an oil purifier (its throughput) has reduced, the most likely reason for this is _____

that the wrong type of gravity disc is fitted, the oil temperature is incorrect or the heater is blocked.
that the revolution speed of the bowl has slowed or the electric motor is operating in overload.
that the amount of sealing water of the bowl is insufficient or the containing tank is empty or shut-off.
insufficient delivery from the gear pump, the pump's relief valve is passing, a leaking suction pipe or blocked suction filter.

What regular maintenance is required on the boiler burner?

Cleaning of the burner tips.
Renewing of the electrodes.
Cleaning and resetting of the air register.
Overhauling of the shut-off valves.

If during your engine room watch the steam supply or steam pressure should fall for some reason, what should you check first ?

The viscosity of the heavy fuel oil to consumers.
The fuel oil and lub oil purifiers.
The boiler water level.
The hotwell level.

When inspecting purifier crankcase oil you find that the oil has emulsified or that the level of oil has dropped. The most likely reason is _____

the bowl is leaking water on the main seal ring.
that the safety joint of the oil pump is broken.
that the bowl revolutions have dropped and the purifier is working in overload.
that water is leaking in or oil is leaking out via the oil seal of the horizontal shaft.

If during your engine room watch you hear the boiler water level alarm sound and you notice low water level, but the feedwater pressure is normal, what should you do first ?

Open the by-pass feedwater check valves.
Shut the boiler main steam stop valve.
Start another feedwater pump.
Shut-off the steam heating to the tank consumers.

What are the most common faults resulting in failure to raise adequate vacuum in a fresh water generator ?

Reflector plate corroded, feedwater supply pipe blocked, blocked or dirty tubes in evaporator or in the condenser.
Dirty evaporator, feed reducing valve blocked, by-pass valve of the fresh water to evaporator leaking, vacuum breaker faulty.
Dirty condenser, fresh water pump impeller wear rings worn, vacuum breaker valve worn.
Insufficient flow to eductors (pump pressure or eductor back pressure), leaking fresh water pump shaft seal, leak on casing or cover.

What do you think is the most common cause of poor performance of fresh water generators ?

Underperformance of ejector and/or fresh water pump(s).
Worn brine or vacuum nozzles.
Scaled/dirty heat exchangers, in particular the evaporator.
Internal corrosion of structural components of housing.

What happens if the rudder is moved in a heavy sea?

The main pressure relief valves lift.
The hydraulic motor absorbs the shock.
The over pressure is absorbed by system accumulators.
The telemotor pump prevents movement by increasing the hydraulic pressure.

Review Answers

Auxiliary Machinery. Test 85

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