Auxiliary Machinery. Test 41 – Online Maritime Tests

What is the function of the valves 'PR' fitted between the Port and Starboard cylinders ?

To be opened to allow emergency steering.
To act as automatic by-pass valves when the steering gear is stopped.
To return any excess oil back to the suction of the pump.
To relieve excess pressure, absorbing shock and preventing damage.

What is meant by 'Isothermal' expansion?

Expansion at constant pressure.
Expansion during which heat must be added.
Expansion during which heat is lost.
Expansion at constant temperature.

How is this type of valve kept in place in the cylinder head of an air compressor ?

It is screwed into the valve space of the cylinder head.
It is secured to the cylinder head by bolts.
It is kept in place by a collar flange, bolted on the cylinder head
It is fitted in a valve housing which is bolted by a flange onto the cylinder head.

If the reefer condenser pump 'PP' fails, which pump would you use to supply cooling water to these reefer condensers ?

Fire Pump 'FP'
General Service Pump 'GSP'
Auxiliary SW PUMP 'AS'
Any of these pumps may be used.

Why is it important that the exhaust gas boiler bypass flap to exhaust is operated when the main engine is running at reduced or manoeuvring speed on Heavy Fuel Oil. ?

To ensure proper firing of the engine.
To ensure starting of the engine.
To avoid backpressure on the engine at low speed.
To avoid corrosion in the exhaust gas boiler.

When testing boiler water for chlorides, what does the test indicate?

Total dissolved solids present in the water.
Alkalinity level.
Phosphate present in the water.
Solids in the water from sea water contamination.

If the auxiliary seawater pump 'AS' fails, which pump should be used to cool the condensers ?

Main Sea Water Pump(s) 'MS'.
General Service Pump 'GSP'.
Fire Pump 'FP '.
Hydrophore Pump 'HP'.

What does wheel movement control in an entirely electric steering system?

Current to the steering gear motor/generator.
Current supplied directly to the electric steering motor.
The electrical balance of the wheel and steering motor rheostats. .
Hydraulic transmitter.

How is the valve shown here made air tight in the cylinder head of the compressor ?

A general purpose joint is fitted.
An O-ring of perbunan is fitted between valve and seat.
A copper gasket is fitted.
No joint, both faces lapped to each other.

Why is there a receiver fitted below the condenser of an air-conditioning unit unlike on the condenser of the domestic fridge system ?

Because the air-conditioning does not run in winter climates.
Because the capacity is larger.
Because there is more chance of leakage and Freon escape.
To store spare Freon.

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