Engineering, Control Systems. Test 6 – Online Maritime Tests

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

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

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

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

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

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

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 fuel drain valve in case of engine shut-down.
A de-gassing/ HP gas release by very high fuel temperature.

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

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

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 ?

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

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

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

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