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单选题
When starting an engine, the compressed air enters the cylinder when the corresponding piston is in position of its（）
A
suction stroke
B
compression stroke
C
power stroke
D
exhaust stroke
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单选题Which of the following may cause that an engine doesnt turn on starting air?（）A
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单选题Before starting the engine the air bottle should be （）.A
pumped upB
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dischargedD
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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
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starting air pressure too highB
correct timing of starting air valvesC
three of the six starting valves stuckD
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单选题When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the（）A
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compression strokeC
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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
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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
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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
考题
单选题The compressed air is admitted to each cylinder through a cam operated by starting air valve when the piston has just passed its （）.A
BDCB
TDCC
BBDCD
ATDC
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too low starting air pressureB
main start valve closedC
neither A nor BD
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单选题Compressed air is supplied by air compression to （）.A
the air receiversB
the starting valvesC
the cylinder coversD
the distributors
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单选题（） in what position the engine stops there will always be at least one of the cylinders with its starting air valve open to admit compressed air to start the engine.A
BecauseB
Owing toC
ForD
No matter
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单选题Compressed air is used on board ship （）.A
for starting diesel enginesB
in pneumatic control systemC
in pneumatic toolsD
All the above are true
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单选题The primary task of the compressed air system is to deliver the starting air necessary for （）A
starting the MEB
starting the emergency electric alternatorC
driving the main turbineD
driving the turbocharger
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单选题If an air compressor is used to supply compressed air to outlets throughout the engine room and on deck of a vessel, the system is known as the （）.A
combustion control air systemB
supply air systemC
ships service air systemD
low pressure deck air system
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单选题According to the ship emergency plan, when average accident happened and the captain made the decision to withdraw from the engine room before leaving the engine room, the wrong operation is that （）A
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stopping all the running machineries and electric devicesD
closing the quick-closing valves of all the oil tanks, stopping the boiler and releasing gas
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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
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water accumulation in some engine cylindersC
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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
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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
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单选题When restarting a heavy fuel diesel engine that has been stopped for some time, the engine should（）A
increase the starting air pressureB
use a higher than normal cranking speedC
increase the fuel injection pressureD
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单选题When an engine is starting and has got a sufficiently high speed, say about 20 rpm,（）A
the starting air supply is cut off and fuel is injected into the cylindersB
the fuel feeding is cut off and the turning gear is put inC
the starting air supply is cut off and turning gear is taken outD
the electric blower is shut down and fuel is injected into the cylinders
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单选题Explosions do occur （） caused by the ignition of oil or vapour gaining access from compressors or defective engine starting valves.A
in boiler drumsB
in refrigerating plantsC
in starting air pipesD
in air coolers
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