In a large, low-speed diesel engine the clearance between the piston crown and cylinder head is found to be excessiveIn order to correct for this, you should()
A . build up the piston crown by metal spraying
B . build up the cylinder head by metal spraying
C . insert shims between the crankpin bearing box and the connecting rod foot
D . install a thinner head gasket
相似题目
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A large, low-speed, crosshead, main propulsion diesel engine using residual fuel oils must have a cylinder oil having a ()
A、the use of a poor quality oil
B、the deterioration of its properties
C、the formation of deposits
D、the reduction in heat transfer ability
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When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?()
A . The diesel oil must never be allowed to mix with the heavy fuel
B . The temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valve
C . The heating steam to the pre-heater should be secured as soon as the diesel fuel passes through the three-way valve
D . The heating steam must be secured before the diesel oil passes through the three-way valve
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During maneuvering operations for a direct reversing large, low-speed, main propulsion diesel engine, which of the following actions is used to stop the shaft from turning prior to reversing the engine rotation?()
A . Flywheel inertia
B . Admission of starting air
C . The way of the vessel
D . securing of fuel to the cylinder
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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 shaft
B . compressed air pressure
C . hydraulic “push rods”
D . direct action of the main piston moving dow
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A large, low-speed, main propulsion diesel engine uses sea water to directly cool the ().
A . cylinder heads
B . exhaust valves
C . scavenging air
D . injector
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In each cylinder cover is a large central opening for mounting ()
A . the indicating cock
B . the starting valve
C . air inlet valve
D . the exhaust valve
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On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an ()
A . dial indicator
B . outside caliper
C . bridge gauge
D . tram rod
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When there is a fire in a large electric motor, normally the very FIRST step is to ()
A . secure the electric supply
B . ventilate area to remove smoke
C . start the fire pump and lead out hose
D . apply foam
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The presence of stratus clouds and a dying wind will usually result in().
A . heavy rain
B . heavy snow
C . thick fog
D . clearing skie
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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 vent
B . unburned fuel vapors in the scavenge air receiver
C . lube oil vapors in the crank case
D . lube oil vapors in the engine room
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Which of the listed types of starting systems is often used on large, low-speed, direct reversing, main propulsion diesel engines?()
A . Electric
B . Hydraulic
C . Air
D . All of the above
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Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to ()
A . decrease the time required between cleanings
B . removes all large and small foreign objects
C . ensure a positive flow of oil at all times
D . ensure that all lube oil has been treated twice
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While underway, which of the following would be the FIRST step in reversing a direct reversing large, low-speed, main propulsion, diesel engine?()
A . Manually trip the over-speed device
B . Interrupt the fuel flow to the engine
C . Disengage the safety interlock
D . Slide the camshaft to the neutral positio
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If it becomes necessary to cutout an individual cylinder of a large, low-speed, main propulsion diesel engine, the fuel to that cylinder should be secured and its ()
A . fuel pump should be removed and all connections blanked off
B . cylinder oil feed rate should be increased slightly above that used at normal sea speed
C . cylinder oil feed rate should be reduced
D . cylinder oil feed rate should be increased to the maximum flow capable of the metering pum
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6.In a large enterprise, ________.
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Diana died on Sunday, August 31,1997, following a () crash in Paris.
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“In Africa, every five seconds, a child dies of starvation” , which type of opening does it belong to?
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Before he died he had_________ a large quantity of alcohol.
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This is a very popular book in the U.S., but it died have a history of being banned in Europe, and it was still_in many countries.
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Unfortunately, Gutzom Borglun died in 1941, just a few months______finishing his college education.
A.lack in
B.short of
C.not enough for
D.insufficient in
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If you are in the street when an earthquake occurs, stay in A.large open space
A.Right
B.Wrong
C.Not mentioned
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A child wrapped in a blanket sits propped up in a large wicker chair, toying with a sprig.
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Mary felt lonely after her husband died in a car accident.
A.alone
B.gloomy
C.desolate
D.separate
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A ______ material is one in which the atoms are arranged in a periodic array over large atomic distance.
A.Amorphous
B.Ceramic
C.Polymer
D.Crystalline