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单选题
Air receivers installed in starting air systems are to be （）.
A
cylindrical in shape with service connections located at the top and bottom
B
opened and made available for inspection during biannual inspections provided
C
with automatic drain traps for the removal of moisture
D
so installed as to make the drain connections effective under extreme conditions of trim
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更多 “单选题Air receivers installed in starting air systems are to be （）.A cylindrical in shape with service connections located at the top and bottomB opened and made available for inspection during biannual inspections providedC with automatic drain traps for the removal of moistureD so installed as to make the drain connections effective under extreme conditions of trim” 相关考题
考题
Vessels having main engines arranged for air starting are to be provided with at least__.A.one automatic drain serving both containersB.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
考题
In an operating diesel engine, which of the following conditions 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
考题
Diesel engines obtain combustion air through turbo chargers，blowers，or ______．A.Air startersB.CarburetorsC.Natural aspirationD.Air receivers
考题
Heating，ventilating，and air conditioning（HVAC） systems are______in most of underground subway stations to provide comfortable and fresh air to underground subway stations。A.assembled
B.installing
C.equipped
D.installed
考题
单选题Vessels having main engines arranged for air starting are to be provided with at least （）A
one automatic drain serving both containersB
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
考题
单选题The opening or closing of the cylinder starting valve is controlled by （）.A
the starting air distributorB
the cut-off valve on the air mainC
the main starting valveD
the air bottle control valve
考题
单选题Which of the following may cause that an engine doesnt turn on starting air?（）A
too low starting air pressureB
main starting valve closedC
neither A nor BD
A and B
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Diesel engine starting difficulties due to cold intake air temperatures, can be overcome by using a/an（）A
increase in starting air pressureB
increase in lube oil viscosityC
compression expansion deviceD
jacket water heater
考题
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
考题
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
考题
单选题A diesel engine is turned at normal cranking speed and no ignition occursThis could be the result of （）A
low lube oil temperatureB
low starting air temperatureC
air bubbles in the fuel oil systemD
water in the starting air system
考题
单选题Intercoolers installed on starting air compressors, reduce the possibility of（）A
dust entering the high pressure stageB
lube oil carbonizationC
discharge pulsationsD
inter-stage vapor lock
考题
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
考题
单选题Which of the following may cause that an engine doesnt run on starting air?（）A
too low starting air pressureB
main start valve closedC
neither A nor BD
A and B
考题
单选题The pressure of pilot air is usually （） than that of starting air.A
higherB
lowerC
lowD
high
考题
单选题Air compressors are equipped with unloading systems for the purpose of（）.A
removing all but the frictional load during startingB
relieving intercoolers of high temperature buildupsC
providing high starting torque in the drive motorD
seating valve plates during compressor shutdown
考题
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
考题
单选题Starting air for auxiliary engines may be taken directly from the main reservoirs or through （）.A
an auxiliary reservoirB
a controlling air bottleC
an emergency air compressorD
a main air compressor
考题
单选题What preventative maintenance should be done frequently to diesel engine starting air receivers?（）A
Drain the accumulated moistureB
Test the relief valvesC
Watch the temperature to prevent fluctuations in pressureD
Clean the interior to remove oil and foreign matter
考题
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
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Air compressor receivers should be “blown down” at least （）.A
yearlyB
quarterlyC
monthlyD
daily
考题
单选题When the diesel is stopped, which of the following items is wrong?（）A
keep all systems in normally runningB
the main engine is stand-byC
shut off the starting air bottle outlet valveD
pay attention to the changes of the system parameters
考题
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
考题
单选题Which of the routine maintenance procedure listed is required for starting air receivers?（）A
Frequent draining of accumulated moistureB
Frequent testing of relief valvesC
A close watch on temperature to prevent fluctuations in pressureD
Frequent cleaning to re move oil and foreign matter
考题
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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