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单选题
The scavenge air receiver is of a simplified and modular design with integral non-return flaps, hanging cooler and two auxiliary air blowers（）
A
dozens
B
parcels
C
bundles
D
gallons
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High firing pressures and low exhaust temperature in a diesel engine may resultfrom( ).A.decreased piston to cylinder head clearanceB.increased exhaust system back pressureC.early fuel injection timingD.low scavenge air temperature
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Which of the following problems can occur if you continually fail to drain off condensate from a starting air receiver?A.Corrosion and eventual failure of the tankB.Gumming of the tank relief valvesC.Immediate failure of components downstream of the compressed air systemD.Boiling of the water oil mixture as pressure is reduced
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单选题A substantial increase pressure could be an indication of a/an （）A
worn cylinder linerB
faulty cylinder relief valveC
excessive lube oil pressureD
excessive scavenge air pressure
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单选题Propulsion engines and the vast majority of auxiliary generator engines are designed to allow a generous through-flow of scavenge air in order to control （）A
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scavenge air pressure
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单选题A dirty intercooler on an air compressor will cause （）.A
damage to the un-loader operating diaphragmB
an increase in current flow to the motorC
high pressure in the receiver and filterD
an excessive consumption of crankcase oil
考题
单选题The process of loop scavenge is that the exhaust will be via ports （） the air ports and controlled by the same piston.A
behindB
far fromC
adjacent toD
in front of
考题
单选题Which of the following operation will have a direct impact on the rate of wear in a cylinder liner （）A
amount of scavenge air to the cylinderB
quality of fuel injectedC
viscosity of the lube oilD
compression ratio of the piston
考题
单选题Which of the following statements is not true concerning symptom of a fire in the scavenge air box?（）A
an increase in the exhaust temperature of the affected cylinderB
the turbocharger may surgeC
the explosion pressure in all cylinders will rise violentlyD
smoke from the turbocharger air inlet filter will be seen
考题
单选题What is the function of an air receiver in the compressed air system on a ship? （）A
Condenses moistureB
Provides overpressure protectionC
Purifies the airD
Acts as an accumulator
考题
单选题Condensate must be drained periodically from the air compressor receivers to prevent （）.A
second stage cylinder lockupB
oil sump contaminationC
faulty operation of pneumatic valvesD
corrosion of air receiver baffles
考题
单选题Poor combustion in a diesel engine can be caused by （）.A
high compression pressureB
low intake air temperatureC
low exhaust pressureD
high scavenge air temperature
考题
单选题Great care is dedicated to the removal of from the scavenge air（）A
gravityB
viscosityC
densityD
humidity
考题
单选题Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.A
fuel oil vapor at the sludge tank ventB
unburned fuel vapors in the scavenge air receiverC
lube oil vapors in the crank caseD
lube oil vapors in the engine room
考题
单选题Low cylinder compression pressure and a high exhaust temperature may indicate （）A
early fuel injection timingB
leaking valvesC
a continuously open scavenge air portD
low cooling water temperature
考题
单选题Increased air （） will raise scavenge efficiency and allow a greater mass of air to be compressed； more fuel may now be burned giving an increased power.A
specific volumeB
densityC
viscosityD
calorific value
考题
单选题Whilst the engine is turning, check to see that no water is leaking into the crankcase, scavenge air belt, or from （）.A
exhaust valvesB
starting valvesC
fuel valvesD
the indicator cocks
考题
单选题If a crankcase explosion occurs in a diesel engine, you should stop the engine and（）A
immediately open all crankcase relief portsB
increase crankcase exhauster speed to draw cool air into the engineC
allow the engine to cool naturallyD
increase crank case scavenge air to remove unburned gases
考题
单选题A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）A
has little or no internal frictionB
has a lower effective compression ratioC
operates with scavenge air under a positive pressureD
operates without energy absorbing intake and exhaust strokes
考题
单选题One remedy for a high firing pressure, in addition to a high exhaust temperature in one cylinder of a diesel engine, is to （）A
increase scavenge air pressureB
reduce fuel booster pump pressureC
adjust the fuel rackD
retard fuel injector timing
考题
单选题Which of the following problems can occur if you continually fail to drain off condensate from a starting air receiver?（）A
Corrosion and eventual failure of the tankB
Gumming of the tank relief valvesC
Immediate failure of components downstream of the compressed air systemD
Boiling of the water oil mixture as pressure is reduced
考题
单选题When starting air is admitted, a diesel engine turns over very slowly without firingThe cause may be （）A
an obstruction in an cylinderB
water accumulation in some engine cylindersC
low starting air pressureD
low scavenge air pressure
考题
单选题The shaft and spare parts（） should be well greased in order to avoid corrosion.A
in the store roomB
in the cylinderC
in the scavenge air boxD
in the water box
考题
单选题When occurring a fire in the scavenge air box, the following measures should be taken except for（）A
reducing speed to SLOW and asking bridge for permission to stopB
stopping the fuel oil supplyC
switching-on the auxiliary blowersD
putting the scavenge air box fire extinguishing equipment into function
考题
单选题When received the order "finished with engine" which of the following operations is wrong?（）A
stop the LO pump, SW pump, FW pumpB
stop the priming FO transfer pumpC
engage the turning gearD
open the scavenge air belts drain valve and cover the turbocharger silencer with the dustproof cover
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