Main Propulsion, Turbines, Boilers. Test 6

The starting air valve is fitted for the purpose of:

Bringing the engine up to sufficient number of revolutions for combustion to take place and engine to run
Bringing the engine up to full rpm to start the engine
To retard the engine revolution for manoeuvring purpose.
Turning the engine for starting preparations

The turbocharger (constant pressure) is making 'whoofing' noises. What might be the cause?

Why is a thrust bearing required on this turbine ?

The exhaust temperature in a 4 stroke diesel engine is:

What is the safe time for operating the crankcase door when oil mist alarm is activated and the engine has been stopped?

Why are we blowing the engine before start (slow turning on air) ?

To be sure that all indicator cocks are closed, and no passage into the combustion chamber.
To get fresh air into cylinders ensuring a safe start of the engine.
To be sure that no parts are loose, or that the engine is blocked from rotation.
To be sure that we do not have water collected in the cylinders.

The timing of the engine is delayed. The exhaust temperatures are high. How would you expect this to affect the turbocharger?

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