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单选题
In a medium speed diesel engine, a trunk type piston may be cooled by（） Ⅰ.oil circulation though passages in the piston crown Ⅱ.heat transfer through piston rings and liner wall
A
Ⅰ only
B
Ⅱ only
C
either Ⅰ or Ⅱ
D
neither Ⅰ or Ⅱ
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A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal .the probable ___.A.engine overloadB.leaky valvesC.stuck or broken piston ringsD.low air injection pressure
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On a medium-speed main propulsion diesel engine, the crank-pin or crank journalbearings receive lubricating oil from( ).A.a spindle lubricatorB.an oil jetC.internal splashingD.drilled passages in the crankshaft
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On a diesel engine equipped with a hydraulic speed control governor, hunting in many cases can be corrected by adjusting the______.A.accumulator spring compressionB.balance pistonC.compensating(补偿) needle valveD.proportional piston
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单选题To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）A
Speed limiting governorB
Over-speed governorC
Over-speed tripD
Over-speed relay
考题
单选题A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal the probable（）A
engine overloadB
leaky valvesC
stuck or broken piston ringsD
low air injection pressure
考题
单选题Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent （）.A
excessive crankcase pressureB
excessive lube oil temperatureC
contamination of the lube oil by waterD
contamination of the cooling water by lube oil
考题
单选题（） can be found on most medium to large merchant vessels even if the main engine is either a steam turbine or 2-stroke crosshead engine.A
The medium speed 4-stroke trunk piston engineB
The low speed 2-stroke crosshead engineC
The medium speed 2-stroke crosshead engineD
The low speed 4-stroke trunk piston engine
考题
单选题The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.A
direct action of cam shaftB
compressed air pressureC
hydraulic “push rods”D
direct action of the main piston moving down
考题
单选题Low compression of diesel engine may result from （）A
a worn cylinderB
broken piston ringsC
any of A and BD
none of the above
考题
单选题Marine four-stroke diesel engines are mainly （）.A
of crosshead typeB
of trunk piston typeC
of low speed typeD
all the above
考题
单选题Why a gearbox is needed in a ship driven by a medium-speed diesel engine?（）A
To reduce the main engine speedB
To increase the main engine speedC
To govern the main engine speedD
To fix the propeller shaft
考题
单选题One end of a cylinder for a medium or high-speed diesel engine is sealed by the piston and rings, the other end is sealed by the （）A
crankcaseB
cylinder headC
valve coverD
engine frame
考题
单选题Trunk type diesel engine pistons are effectively cooled when heat is（）A
radiated through the engine blockB
transferred to water cooled cylinder wallsC
conducted through the piston crownD
transferred to escaping exhaust gases
考题
单选题In a trunk type diesel engine piston, the thickness of the head or crown is determined by the（） Ⅰ.statically balanced Ⅱ.heat dissipation requirementA
Ⅰ onlyB
Ⅱ onlyC
both Ⅰ and ⅡD
neither Ⅰ nor Ⅱ
考题
单选题Defective governor in a diesel engine may lead to （）.A
smoky exhaustB
starting failureC
ignition relayD
over speed
考题
单选题In conventional systems, the injection pressure（）, while it’s（）in common rail diesel engines.A
fluctuates with the engine speed to some extent, independent of the engine speedB
keeps constant at all engine speed, dependent on the engine speed to some extentC
keeps constant at all engine speed, independent of the engine speedD
is decided by the engine speed, constant at all engine speed
考题
单选题Persistent knocking of one cylinder of a diesel engine ceases when the fuel supply to that cylinder is securedThis problem may be a result of （）A
low loading of that cylinderB
faulty combustion in that cylinderC
sluggish piston ring actionD
excessive piston cooling
考题
单选题On a diesel engine equipped with a hydraulic speed control governor, hunting in many cases can be corrected by adjusting the （）A
accumulator spring compressorB
balance pistonC
compensating needle valveD
proportional piston
考题
单选题During the power stroke of a four-stroke/cycle diesel engine, most of the side thrust of a trunk-type piston is absorbed by the（）A
piston skirtB
pinionC
crossheadD
compression rings
考题
单选题Trunk-type diesel engine pistons are most effectively cooled by heat（）A
conducted through the engine blockB
conducted to water cooled cylinder wallsC
conducted through the piston crownD
loss to escaping exhaust gases
考题
单选题Poor quality fuel being used in a turbocharged medium-speed, diesel engine could result in （）A
hard startingB
excessive fuel consumptionC
loss of powerD
all of the above
考题
单选题The term medium speed diesel engine is currently taken to mean an engine with an operating rotational speed of （） rpm.A
below 300B
above 1200C
between 300 to 1200D
below 1200
考题
单选题The function of diesel engine piston compression rings is to （）.A
prevent piston side thrustB
prevent engine friction lossesC
transmit heat from the piston to the cylinder linerD
remove oil from the cylinder combustion space
考题
单选题If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to（）A
excessive ring actionB
excessive ring temperatureC
improper ring rotationD
excessive ring face wear
考题
单选题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
leadB
forged steelC
alloy steelD
aluminum alloy
考题
单选题On a turbo-charged, medium-speed diesel engine, which of the following problems is an indication of a restricted air intake passage?（）A
Engine is hard to startB
Engine missesC
Surges at governed RPMD
Coolant temperature is too low
考题
单选题In a diesel engine,（） works as working medium and changes the heat energy to mechanical energy, changes the reciprocating movement to rotary moment（）A
fuel spray； the burning of the fuelB
the burned gas mixture； connecting rodC
medium shaft；crankshaftD
the burned gas mixture； piston rod
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