题目内容

Oil is supplied to the cylinder liner wall and the piston rings by means of( ) giving a carefully controlled oil feed, through injectors or quills.

A. electric magnet valve
B. common rail system
C. mechanical lubricators
D. inductors

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In some designs, cylinder oil supplying is timed so that the oil impinges only on( ) thus ensuring the most efficient lubrication.

A. the piston ring belt
B. the piston crown
C. the piston skirt
D. the piston

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Steam generated by boilers may be used for driving the main engine when( ) are fitted.

A. diesel engines
B. gas engines
C. gas turbines
D. steam turbines

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Circulation in a water-tube boiler is caused by the difference in the( )

A. area and length of the water-tubes
B. densities of the circulating water
C. heights of the boiler drum
D. angle of inclination of the tubes

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Which of the following statements is NOT the characteristic of fire-tube boiler?( )

A. Natural good circulation.
B. Capable of operating with poor quality feed water.
C. Providing low pressure steam.
D. Hot furnace gas passing through the tubes.

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Oil is supplied to the cylinder liner wall and the piston rings by means of( ) giving a carefully controlled oil feed, through injectors or quills.

A. electric magnet valve B. common rail system C. mechanical lubricators D. inductors

In some designs, cylinder oil supplying is timed so that the oil impinges only on( ) thus ensuring the most efficient lubrication.

Steam generated by boilers may be used for driving the main engine when( ) are fitted.

Circulation in a water-tube boiler is caused by the difference in the( )

Which of the following statements is NOT the characteristic of fire-tube boiler?( )

A. electric magnet valve
B. common rail system
C. mechanical lubricators
D. inductors