Engineering, Control Systems. Test 29

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 ?

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

What type of engine is shown here?

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

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

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

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

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

Where is the fuel injector leak-off connection fed?

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

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

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

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

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

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

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

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 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.
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.

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