B． lifting of the cylinder safety valve C． a scavenge fire D． opening of the manhole
206.If the needle valve in a fuel injection nozzle sticks open _____.
A． no fuel will be delivered through the nozzle B． the nozzle will overheat and crack C． time of injection will change √ D． fuel will leak into the drain line
207.If the sump _____ were to rise this would indicate water leakage into the oil and an
investigation into the cause must be made. A． temperature B． viscosity C． lever D． level √
208.If there is water in fuel oil, the revolution of the engine will _____.
A． decrease √ B． increase C． be dismantled D． be reassembled
209.In a _____ engine the charge of air in the cylinder before compression commences is above
atmospheric pressure. A． pressure charged √ B． naturally aspirated C． contaminated D． high speed diesel
210.In a central cooling system, used in some modem ships, sea water is supplied to cool
_____ which will circulate to other individual cooler, greatly reducing the corrosion problems.
A． fresh water √ B． sea water C． cooling oil D． emulsion
211.In a central cooling system, used in some modem ships, sea water is supplied to cool
_____ which will circulate to other individual cooler, greatly reducing the corrosion problems.
A． main bearings B． sea water C． cooling oil
D． lower temperature fresh water √
212.In a commonly used fuel oil system, the oil is stored in tanks in the double bottom from
which it is pumped to _____ and heated. A． a service tank B． a settling tank √ C． an expansion tank D． a double bottom tank
213.In a complete oil/water separator, more oil will separate out onto the underside of these
plates and travel outwards until it is free to rise into the oil collecting spaceWhats the meaning of \ A． a separator B． oil √ C． water
D． an oil collecting space
214.In a diesel engine, fuel must be broken up into a spray of fine droplets to _____.
A． increase its quality B． obtain complete burning √ C． reduce its weight D． all of the above
215.In a four-stroke engines the camshaft rotates at _____.
A． half the engine rotational speed √ B． twice the engine rotational speed C． the engine rotational speed
D． four times the engine rotational speed
216.In a general oil cooler circulated by sea water, the oil is at a higher pressure, the
result being that any leak in the cooler will mean a loss of _____. A． oil √ B． sea water C． air
D． fresh water
217.In a marine diesel engine the oil sump is _____.
A． just below the crankcase √ B． the oil cup for the exhaust valve C． the pan for collecting drain fuel oil D． oil circulating pump
218.In a purifier changing to a gravity disc with larger hole diameter will move the interface
towards the _____. A． bowl periphery √ B． bowl center C． upper surface D． lower surface
219.In a purifier, the interface between the liquid seal and the oil should be positioned
as close as possible to _____. A． the outlet of oil B． the outlet of water C． the bowl periphery √ D． the center of bowl
220.In a typical fuel oil system, the oil is stored in tanks in the double bottom from which
it is pumped to _____ and heated. A． a service tank B． a collecting tank C． a sump
D． a settling tank √
221.In a typical fuel system, the oil is stored in _____ in the double bottom.
A． setting tanks B． service tanks C． tanks √ D． drain tanks
222.In addition to lubricating, cylinder oil assists in forming a gas seal and contains _____
which clean the cylinder liner. A． additives √ B． water C． grease D． acid solution
223.In an engine with a pot-shaped piston, some lubricating oil from the main bearing will
pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the _____. A． crosshead B． crankpin C． crank journal D． gudgeon pin √
224.In an engine with a pot-shaped piston, some lubricating oil from the main bearing will
pass along a _____ in the crankshaft to the bottom end bearing and then up a connection rod to the gudgeon pin. A． telescopic pipes B． large bore C． drilled passage √ D． tied rod
225.In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air
will enter into the cylinder _____ and the gases exhaust _____, there being an adequate overlap between the inlet opening and the exhaust closing.
A． downwards/upwards √ B． upwards/downwards C． downwards/downwards D． upwards/upwards
226.In a four-stroke engine the camshaft rotates at _____.
A． half the engine speed √ B． twice the engine speed C． the engine speed
D． four times the engine speed
227.In an oil cooler circulated by sea water, the oil is at a larger pressure, the result
being that any leak in the cooler will mean a loss of _____. A． oil √ B． sea water C． refrigerant D． fresh water
228.In an ordinary diesel engine the fuel injection begins _____.
A． after TDC B． before TDC √ C． after BDC D． before BDC
229.In an ordinary four-stroke engine the exhaust valves open _____
A． after TDC B． before TDC C． after BDC D． before BDC √
230.In each cylinder cover is a large central opening for mounting _____.
A． the indicating cock B． the starting valve C． air inlet valve D． the exhaust valve √
231.In each cylinder cover there are two or three holes for _____.
A． the exhaust valves B． the fuel valves √ C． indicator cocks D． the fuel pumps
232.In four strokes engine, the cycle of events is completed in four strokes of _____.
A． the cylinder B． the crankshaft
C． the piston √ D． the cross-head
233.In general, _____ is suitable for delivering small quantities at high pressure.
A． reciprocating pump √ B． gear pump C． centrifugal pump D． vane pump
234.In large marine diesel engines cylinder oils usually contain additives formulated to
impart the _____ to clean the rings and grooves. A． inefficiency B． oiliness C． detergency √ D． purity
235.In order to ensure perfect atomization, the fuel oil _____ before injection.
A． has to be cooled B． has heated C． has preheated
D． has to be preheated √
236.In order to ensure the safety of the ship and its equipment during UMS operation, certain
essential functions _____. A． must be provided √ B． may be provided C． have provided D． can be provided
237.In order to increase the wearing resistance, the cylinder liner surfaces are sometimes
_____.
A． aluminum-plated B． bronze-plated C． zinc-plated D． chromium-plated √
238.In order to inspect both piston and cylinder wall thoroughly, the cylinder cover should
be taken off and the piston should be _____. A． craned out B． rolled out C． lifted out √ D． turned out
239.In some designs the cylinder oil is timed so that the oil injects only on the _____.
A． piston crown B． piston groove