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Pump up the starting air reservoirs to their maximum pressure and ______the air reservoirs and air system.
A.open
B.close
C.drain
D.vent
参考答案
更多 “ Pump up the starting air reservoirs to their maximum pressure and ______the air reservoirs and air system.A.openB.closeC.drainD.vent ” 相关考题
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单选题Vessels having main engines arranged for air starting are to be provided with at least （）A
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two air starting containers of approximately equal sizeC
one control air container and one starting air containerD
one additional means of starting the main engine
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the starting air distributorB
the cut-off valve on the air mainC
the main starting valveD
the air bottle control valve
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单选题In general, the oil mist defectors include a base plate with air blast pumpThe function of air blast pump is to （）crankcase.A
supply clean air to the measuring compartment of the units for more accuracyB
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单选题Air reservoirs are designed, built and tested similarly to （）.A
boiler drumsB
hot wellsC
condensersD
evaporators
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单选题Which of the following may lead to the engine NOT to start on air?（）A
starting air pressure too highB
correct timing of starting air valvesC
three of the six starting valves stuckD
the turning gear disengaged
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单选题Which of the following methods is used to prevent throttling of compressed air through the diesel engine air starting valves?（）A
Holding the valve open for a long periodB
Increasing the starting air pressure usedC
Opening the stating air valve quicklyD
Reducing the starting air valve size
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单选题If a diesel engine fails to start，one of the likely causes is （）A
low compression temperatureB
low ambient air pressureC
high lube oil pump pressureD
high fuel oil booster pump pressure
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单选题The engine will fail to start unless （）.A
the pressure of the starting air is high enoughB
there is enough air in the air reservoirsC
the air is supplied into the cylinders in the appropriate sequenceD
all of the above
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单选题Each cylinder has one starting valve which is usually opened by air pressure and closed by （）A
nuts and boltsB
new jointsC
spring forceD
sealing rings
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单选题The pressure of pilot air is usually （） than that of starting air.A
higherB
lowerC
lowD
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单选题The compressed air is supplied by （） to the air reservoirs.A
compressorsB
forced fansC
ventilatorsD
generators
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单选题In order to properly remove air from the casing of a centrifugal pump when starting, the pump should have a （）.A
positive headB
negative suction headC
mechanical sealD
vent valve attached to the casing at the top of the volute
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单选题The purpose of an air compressor unloading device is to （）A
drain water from the air receiverB
drain water from the cylindersC
delay the compression process until the motor is up to speedD
check pump alignment
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单选题Starting air valves are held firmly on their seats by（）A
cam rollers on the camshaftB
spring forceC
air pressure on top of the valve differential pistonD
air pressure on the bottom of the valve differential piston
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单选题Which one of the followings might not be employed to create vacuum for flash type evaporator? （）A
high-pressure steam-driven air-ejectorB
motor-driven vacuum pumpC
water-motivated air eductorD
centrifuge pump
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单选题The air reservoirs must have （） fitted to prevent rupture in the event of fire.A
high pressure alarmB
fire alarmC
extinguishersD
fusible plugs
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单选题An un-loader is installed on an air compressor to （）.A
bypass the high pressure stage to the low pressure stage on 100% of the air compressors in serviceB
prevent excessive inter-stage pressure buildupC
control compressor discharge pressureD
remove all but the frictional load during starting
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单选题Starting air for auxiliary engines may be taken directly from the main reservoirs or through （）.A
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a controlling air bottleC
an emergency air compressorD
a main air compressor
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单选题Pump up the starting air reservoirs to their maximum pressure and （）the air reservoirs and air system.A
openB
closeC
drainD
vent
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单选题In heavy marine engine the practice is to drive the engine on（）which has previously been stored in starting air reservoirs.A
electric motorB
hydraulic motorC
compressed airD
turning gear
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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
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单选题In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?（）A
noise coming from that air starting valveB
continuous operation of the starting air compressorC
zero air pressure in the air starting systemD
overheated starting air pipe to the cylinder head
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单选题Which of the routine maintenance procedures listed is required for starting air receivers?（）A
over-speedingB
overloadC
low exhaust temperatureD
high crankcase pressure
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单选题The highest pressure in a diesel engine cylinder normally occurs （）.A
at TDCB
before TDCC
after TDCD
during air starting
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单选题The starting air bottle should be pumped up to maximum pressure by the （） before start of the engine.A
air compressorB
refrigeration compressorC
vacuum pumpD
purifier
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