Piston No2 of main engine has been removed, and it will be （） by noon tomorrow.

相似题目

• The function of the piston compression rings used in a diesel engine is to （）

  A . seal the space between the piston and liner B . transmit heat from the piston to the cylinder liner C . reduce the amount of combustion gas blow-by D . all of the above

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• While engine is in operation the piston moves up and down, thus causing the rotation of the （）.

  A . crankcase B . slipper C . cam housing D . crankshaft

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• The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）

  A . Low compression pressure and high exhaust temperature B . Low firing pressure and high exhaust temperature C . Low compression pressure and low exhaust temperature D . Low firing pressure and low exhaust temperature

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• Which of the following statements is true regarding the installation of piston rings on two-stroke/cycle, diesel engines as compared to four-stroke/cycle, diesel engines?（）

  A . In a two-stroke/cycle engine, the rings run hotter, requiring the end gap to be greater B . Some provision must be made in a two-stroke/cycle engine to keep the rings from binding in the ports C . No gap is required to exist between the ends of the ring when cold in a two-stroke/cycle engine, but a small gap is required in a four-stoke/cycle engine D . The gaps should be staggered on either side of a piston in a two-stroke/cycle engine, while staggering is not necessary in a four-stroke/cycle engine

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• A possible cause for an individual piston to knock when at TDC on a slow-speed, two-stroke/cycle main propulsion diesel engine could be due to （）

  A . early fuel injection B . excessive bearing play within the running gear C . overloading of the cylinder D . all of the above

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• Which of the following characteristic of lube oil helps to reduce the amount of deposits in the piston ring belt during the combustion process in a diesel engine?（）

  A . Low viscosity index B . Low carbon forming tendencies C . High film strength D . High non-corrosive qualitie

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• If a diesel engine has been stopped because of piston seizure due to severe overheating, the crankcase（）

  A . inspection covers should not be opened until the engine has cooled B . ventilation system should be continued in operation for one hour for cooling C . scavenge pump should be immediately secured to prevent loss of lube oil D . explosion covers should be opened slightly to provide extra ventilatio

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• In some diesel engine designs,（）the injection of cylinder oil is timed to impinge when the piston and only impinge on（）

  A . is coming upward；cylinder ring belt B . is going downward；piston ring belt C . is coming upward；piston ring belt D . is going downward；cylinder ring belt

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• Who is in charge of the main engine?（）

  A . The chief engineer B . The second engineer C . The third engineer D . The fourth engineer

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• The main purpose of the piston oil scraper rings is to （）.

  A . seal the space between the piston and the liner B . reduce the amount of lube oil burned in the combustion chamber C . transmit heat from the piston to the cylinder liner D . damp out fluctuations of the piston side thrust

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• It is during （） that work energy is being put into the engine; during the other 3 strokes of the piston, the engine is having to do the work.

  A . the suction stroke B . the compression stroke C . the expansion stroke D . the exhaust stroke

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• (Piston area)X(Piston stroke)K(numbers of the cylinders)=engine（）

  A . brake horsepower B . displacement C . cylinder volume D . cylinder clearance

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• 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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• In a trunk type diesel engine piston, the thickness of the head or crown is determined by the（） Ⅰ.statically balanced Ⅱ.heat dissipation requirement

  A . Ⅰ only B . Ⅱ only C . both Ⅰ and Ⅱ D . neither Ⅰ nor Ⅱ

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• Combustion gases formed in the cylinder of a diesel engine are prevented from blowing past the piston by （）

  A . cylinder valves B . compression rings C . piston skirts D . oil ring

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• In diesel engines designed with a crosshead, the motion of the piston rod can be described as （）.

  A . reciprocating at the piston pin, rotary at the crank pin B . reciprocating at the crank pin, rotary at the piston pin C . straight reciprocation D . straight rotatio

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• Incomplete combustion in a running diesel engine can cause piston rings to become stuck as a result of （）

  A . residual carbon deposits B . lube oil viscosity breakdown C . uneven heat expansion of the rings D . uneven heat expansion of the pisto

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• In a four-stroke/cycle diesel engine, after the completion of the power stroke, the piston will move（）

  A . up and draw in a fresh air charge B . down to burn off fuel C . down to compress the fuel air charge D . up and force out the exhaust gase

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• During the power stroke of a four-stroke/cycle diesel engine, most of the side thrust of a trunk-type piston is absorbed by the（）

  A . piston skirt B . pinion C . crosshead D . compression ring

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• BHP stands for the（）of the main engine.

  A . breadth dimension B . builder's name C . brake horsepower D . revolutions per minute

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• Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（）

  A . Control the amount of lube oil burned in the combustion chamber B . Transmit heat from the piston to the cylinder liner C . Prevent damage to ring groove inserts by acting as a heat dam D . Dissipate combustion chamber gas pressure by channeling it through the ring ga

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• When inspecting piston rings through the ports of a two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of （）

  A . insufficient lubrication B . improper piston cooling C . blow-by D . overload operatio

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• The main function of piston compression rings is to （）

  A . prevent excessive cylinder liner wear B . reduce friction losses in the engine C . seal the space between the piston and the liner D . limit upward flow of lube oil into the combustion space

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• In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a （） in the crankshaft to the bottom end bearing andthen up a connection rod to the gudgeon pin.

  A . telescopic pipes B . large bore C . drilled passage D . tied rod

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