Engineering, Control Systems. Test 6 – Online Maritime Tests

What is the function of valve 'PR' in this fuel circuit ?

A safety blow-off valve in case of Emergency Stop.
A constant pressure regulating valve.
A de-gassing/ HP gas release by very high fuel temperature.
A fuel drain valve in case of engine shut-down.

Why is a slow speed two stroke diesel the most suitable for a single fixed pitch propeller vessel?

More fuel-efficient
Easier to reverse and no propulsion gearbox required
Affords a better engine layout
Less complicated than medium speed engines

Which of the following is the distance between the piston and the cylinder head when the piston is at bottom dead center ?

Cylinder clearance.
Combustion clearance.
Compression clearance.
Any of these.

During operation of the main engine, the exhaust temperature increases on one of the cylinders. The turbocharger starts surging and smoke is coming from the inlet air filter. What is the probable cause ?

Scavenge box fire.
Fuel valve seized in open position.
Turbocharger failure.
High back pressure in the exhaust system.

In the case of a serious main engine malfunction what would be your course of action?

Attempt to rectify the fault.
Stop the engine immediately and investigate the cause.
Slow down the engine and attempt to rectify the fault.
Inform the bridge watch keeper before taking any action.

When carrying out piston overhaul, why it is important to clean the ring grooves properly?

To make the ring fit in the groove.
To make sure gas pressure can enter freely on top of and behind the piston ring .
All rings must be changed to make a perfect sealing.
So that the piston rings can move freely in the grooves.

On a Bosch type fuel injection pump how does the rack adjust the fuel delivery?

By altering the length of time the fuel pump roller contacts the cam.
By altering the opening and closing of the delivery valve.
By altering the effective stroke of the plunger.
By increasing the delivery pressure.

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