Auxiliary Machinery. Test 41

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

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

What is meant by 'Isothermal' expansion?

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

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

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

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

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

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

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

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

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.

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

It is secured to the cylinder head by bolts.
It is screwed into the valve space of the cylinder head.
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.

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

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

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

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

Review Answers

Auxiliary Machinery. Test 41

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