135.Diesel engines are started by supplying _____ into the cylinders in the appropriate
sequence for the required direction. A． cooling water B． compressing air C． compressed air √ D． cylinder oil
136.Diesel engines are started by supplying _____ into the cylinders in the appropriate
sequence for the required direction. A． fuel oil B． diesel oil C． compressed air √ D． jacket water
137.Diesel oil may be used to cool _____ of a diesel engine.
A． cylinders B． exhaust valves C． pistons D． fuel valves √
138.Dirt in the fuel oil system of a diesel engine can cause _____.
A． clogged filters √ B． poor combustion
C． overloading of the diesel D． shock of fuel lines
139.Dirty oil must be _____ before being used again.
A． mixed with clean oil B． purified √ C． heated D． strained
140.Doors are generally formed in the _____ of the both in-line and Vee engines to give
maintenance access to the crankshaft main and connecting rod large end bearing. A． bedplates B． columns √ C． cylinder blocks D． safety caps
141.Due to _____ action of pistons some relative motion between parts in contact in the coolant
supply and return system must occur. A． reciprocating √ B． rotating C． running D． removing
142.During _____, the starting air valves should be closed to prevent the engine from turning.
A． overhaul √ B． running C． blowing down
D． All of the above are correct
143.During repair, lubrication lines and orifices must be _____.
A． taken away B． engaged C． connected D． sealed off √
144.During the inspection, the starting air valves should be closed _____ the engine from
turning. A． to increase B． to speed up C． to prevent √ D． to reduce
145.During the suction stroke, the piston is moving _____.
A． inwards B． outwards C． downwards √ D． upwards
146.During working, when the piston is near the _____, the air ignites the fine spray of
fuel. A． TDC √ B． DTC C． BDC D． BCD
147.Each crank is made up of two crank webs joined by a common _____ to which the bottom
end bearing is fitted. A． throw B． crankshaft C． crankpin √ D． crosshead
148.Each cylinder has one starting valve which is usually opened by air pressure and closed
by _____.
A． nuts and bolts B． new joints C． spring force √ D． sealing rings
149.Each cylinder is closed at the top by a _____, made of a special heat-resistant steel.
A． cylinder liner B． coupling flange C． cylinder cover √ D． piston crown
150.Each cylinder liner on the marine medium speed engines _____.
A． is usually cooled by sea water B． can be replaced when worn out √
C． is in direct contact with the water in the bore of the cylinder D． can t expand when heated
151.Each journal and pin should be examined for _____ and grooving.
A． bridges B． recesses C． rears D． ridging √
152.Each piston stuffing box is provided with two sealing rings and three_____.
A． packings B． piston rings C． distributor rings D． scraper rings √
153.Either a low injection pressure or a leakage of piston rings is able to lead _____.
A． a high exhaust temperature B． a high smoky exhaust √ C． a high output D． a high compression
154.Emulsion oils and sodium nitrite are both approved additives, but the latter cannot be
used if any pipes are _____ or if any soldered joints exit. A． chromed B． welded C． galvanized √ D． bolted
155.Emulsion oils and sodium nitrite are both approved additives, but _____ cannot be used
if any pipes are galvanized or if soldered joints exist. A． the latter √ B． latter C． former D． the former
156.Energy losses due to _____ occur in every machine.
A． speed
B． friction √ C． impact D． atmosphere
157.Engage the flywheel with the _____.
A． turning gear √ B． motor C． driving gear D． driven gear
158.Engine _____ refers to the relative time of position of crank, at which each operation
during the cycle is commenced and is completed. A． timing √ B． deviation C． firing order D． phase
159.Engine _____ refers to the relative time of position of crank, at which each operation
during the cycle is commenced and is completed. A． timing √ B． power C． firing order D． dead center
160.Engine fuel pump index is _____.
A． the viscosity index B． the fuel oil contents C． the starting speed
D． the reading at the rack √
161.Excessive clearances in the main or crank-pin bearings will sometimes be indicated by
_____ before any bearing knock is heard. A． loss of flow in the fuel system B． loss of pressure in the air system C． loss of flow in the lubricating system D． loss of pressure in the lubricating system √
162.Exhaust temperature increases in all cylinders, the possible cause may be_____(1)
increased scavenging air temperature, (2) air in fuel pumps and fuel valves, (3) fouling of air and gas passages. A． (1)+(2) B． (1)+(3) √ C． (2)+(3) D． (1)+(2)+(3)
163.Expansion tank should be used to remove _____ from cooling water.
A． scale B． sludge C． chemicals D． air √
164.Factor influencing the position of the interface between the liquid seal and the oil
in a purifier is _____. A． throughput B． back pressure C． gravity disc
D． None of the above is wrong √
165.Failure of fuel injection is usually due to trouble in the _____.
A． exhaust valves B． mechanical lubricators C． cooling water pumps D． fuel injection pumps √
166.Fix the fuel injector into _____ after repair.
A． the cylinder liner B． the cylinder cover √ C． the cylinder jacket D． the piston
167.For a diesel engine, when the piston is at the _____, the clearance volume is the largest.
A． TDC B． DTC C． BDC √ D． DBC
168.For a generator engine, after passing through the turbine the exhaust gas may be conducted
out into the _____. A． intercooler B． open air √ C． oil fired boiler D． B and C
169.For a main diesel engine the lube oil in the bearings is drawn from _____, usually located
in the bedplate. A． a gravity tank B． a sump √ C． a vessel D． a bottle