Auxiliary Machinery. Test 85

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 _____

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

What regular maintenance is required on the boiler burner?

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

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

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

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

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

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

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

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 ?

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

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

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

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

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

Review Answers

Auxiliary Machinery. Test 85

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