题目内容

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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Marine boilers are used for producing steam which may be used for the following except( )

A. driving auxiliary machinery
B. driving the main engines
C. heating heavy oil
D. producing drinking water

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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

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?( )

Marine boilers are used for producing steam which may be used for the following except( )

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