275.Oil will lubricate these parts _____ effectively than water.
A． much B． more √ C． most D． less
276.On a diesel engine, fuel is delivered into the combustion space by _____.
A． a cooling system
B． a lubrication oil system C． an electric system D． an injection system √
277.On a four-stroke diesel engine, when the piston is driven downwards by the expanding
gas, it delivers power to the crankshaft through the _____. A． thrust block B． sounding rod C． connecting rod √ D． push rod
278.On opposite ends of a single shaft of a turboblower are a gas driven _____ and a air
compressor, which are sealed each other. A． charge air receiver B． scavenging air belt C． turbine √ D． air cooler
279.On the top of the cylinder is mounted the cylinder cover which is pressed onto _____
of the cylinder liner by means of nuts and studs. A． the camshaft B． the flange √ C． the ridge D． the bulge
280.On top of scavenging air box is mounted a strong cast iron frame for each cylinder known
as_____.
A． cooling jacket √ B． cylinder liner C． piston crown D． cylinder cover
281.Once a fire is detected the engine should be slowed downOn no account _____.
A． the trunking should be opened up B． should the trunking be opened up √ C． the trunking should not be opened up D． should the trunking not be opened up
282.Once a scavenge fire is detected the engine _____.
A． will be speeded up B． should be slowed down √ C． must slow down D． have to be slow down
283.Once a scavenge fire is detected, fuel should be shut off from the affected cylinders
and cylinder lubrication increased _____ the risk of seizure. A． to protect B． to guard C． to maximize D． to minimize √
284.Once all cylinders are firing regularly, _____ is shut off.
A． the exhaust valve B． the starting air √ C． the inlet valve D． the fuel oil
285.Opening of the cylinder _____ will admit compressed air into the cylinder.
A． safety valve B． indicator cock C． blow-down valve D． start valve √
286.Operating conditions in the crank chamber are very _____ those in the cylinder.
A． the same as B． similar to C． separated from D． different from √
287.Persistent knocking in one cylinder of a diesel engine could be caused by_____.
A． a low load on that cylinder B． sluggish piston ring action C． excessive piston crown cooling D． excessive clearance of piston pin √
288.Piston No2 of main engine has been removed, and it will be _____ by noon tomorrow.
A． lifted B． reassembled √ C． dismounted D． disassembled
289.Pistons may be made in _____ in order to keep the weight down for balancing purposes
at high speed. A． cast iron
B． forged steel C． stainless steel D． aluminum alloy √
290.Pistons of marine medium speed diesel engines may be made of _____ in order to keep the
weight down for balancing purpose at high speed. A． lead B． forged steel C． alloy steel D． aluminum alloy √
291.Please draw out a 0.l mm _____ between the two halves of the bearing to reduce the clearance.
A． shim √ B． gasket C． washer D． packing
292.Please draw out a 0.l mm shim between the two halves of the bearing _____ the clearance.
A． to reduce √ B． to increase C． and reduce D． and increase
293.Pumps and fine filters are arranged _____ with one as standby.
A． in duplicate √ B． in double C． at twice D． for two
294.Put in the engine turning gearNow examine thoroughly inside the crankcase to _____ that
everything is correct. A． make sure √ B． be sure C． assure D． believe
295.Remote control means that the system is being controlled by the operator who is situated
_____ from the system. A． automatic B． local C． remote √ D． manual
296.Rotating flyweights acting against spring pressure make a simple type of _____.
A． governor √ B． safety valve
C． reducing valve D． feed water regulator
297.Scavenging is _____ of exhaust gases by blowing in fresh air.
A． the suction B． the compression C． the removal √ D． the deliver
298.\
A． injecting fuel oil into a cylinder
B． removing exhaust gases from the cylinder √
C． forcing air into the cylinders under pressure after the exhaust valve has dosed D． a combination of all the above
299.Sea water is not directly used as a coolant for engines because of its _____.
A． low specific heat B． corrosive action √ C． high expense D． acid property
300.Sea water is not used directly as a coolant because of _____.
A． low specific heat B． high specific heat C． corrosive action √ D． high viscosity
301.Sediment collects in a tubular purifier _____.
A． on top cover B． on sides of bowl √ C． in drain line on the discs D． on the discs
302.Shims of different thicknesses are inserted between the shells to enable adjustment of
_____.
A． the bearing clearances √ B． the bearing thickness C． the bearing strength D． the bridge hardness
303.Since the burning or combustion takes place within the engine itself, the engine is known
as _____.
A． a fire -tube boiler
B． an internal combustion engine √ C． an external combustion engine D． an internal combustion generator
304.Smaller engines can be made more rigid than large ones and may not have _____.
A． connecting rods B． crankshaft C． crankcase D． through bolts √
305.Smaller engines can be made more rigid than large ones and may not have _____.
A． through bolts √ B． dividing walls C． sloping surfaces D． relative angles
306.Smaller engines can be made more rigid than large ones and may not have _____.
A． through bolts √ B． turbo-chargers C． bed plates D． columns
307.“Stand by engine” means _____.
A． prepare to stop the engine
B． assemble an engine on its bedplate C． make an engine ready for starting √ D． make an engine run steadily
308.Such an engine frame helps _____ the engine and so protect the bearings from the
deformation forces transmitted via the ships double bottom. A． to stiffen √ B． to soften C． to loosen D． to wear
309.The _____ of the main shaft should be measured with a _____.
A． clearance/calipers B． sinking/bridge gauge √ C． diameter/bridge gauge D． clearance/lead wire
310.The _____ engine is used for alternators and some times for main propulsion with a gearbox
to provide a propeller of between 90 to 120 rpm.. A． four-stroke √ B． two-stroke C． slow speed D． reversible
311.The _____ is not properly set thus causing either advanced or retarded firing.
A． piston