Engineering, Control Systems. Test 29

What important contribution does Nitrogen have to the combustion process in a Diesel engine?

Assists in the cooling process during combustion.
Assists in mixing the charge air with the atomised fuel.
Prevents the deposition of damaging elements on valves and seats.
Acts as a catalyst to the combining of oxygen and the hydrocarbons.

Where is the fuel injector leak-off connection fed?

Into the fuel bunker tanks.
Into the fuel oil separator suction.
Into the 'in use' daily service tank.
Into the oily bilge collection tank.

The revolutions on the turbocharger have increased during the night with an unmanned engine. This could be caused by _____ .

poor combustion due to malfunction of fuel valves.
the viscosity of the fuel being high.
the wind and current holding the vessel back.
the wind and current being favourable.

Crankshaft distortions need to be measured and are referred to as _____ .

crankshaft deflection measurements.
crankshaft misalignment calibrations.
crankshaft distortion readings.
Any of these answers.

The ash content of a fuel oil is significant because it _____

is non-combustible and remains partly in the engine.
indicates the quantity of energy released by burning a unit amount of the fuel.
reflects the overall thermal efficiency of the fuel oil.
is useful for determining proper atomization temperatures.

What type of engine is shown here?

A two stroke diesel with loop scavenging.
A two stroke diesel with piston underside scavenging.
A two stroke diesel with uniflow scavenging.
A two stroke diesel with spiral scavenging.

The fuel delivery pipe between fuel pump and injector, is shown here as a red interrupted line. For ' UMS ' classed vessel, how is this pipe best described ?

It is manufactured from Austenit Steel and has flame/smoke detectors fitted in the vicinity.
It must be provided with sensors so that the corresponding fuel pump cuts out in case of rupture.
It is manufactured of high tensile steel and has to have thermal insulation fitted.
It needs to be a shielded pipe so that in case of rupture the fuel leakage can be contained and the alarm sounded.

What is the largest source of energy loss in a diesel engine?

Radiated heat loss from the engine.
Heat loss through the exhaust gas.
Heat loss through the cooling water.
Mechanical loss in bearings and piston.

A cylinder of a large diesel engine is 900 mm in diameter and the firing pressure is 80 bar. What is the force exerted on the piston at this firing pressure ?

487,334 kg
635850, kg
299,074 kg
508,680 kg

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