题目内容

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 which of the listed components is chemical energy converted to thermal energy with regards to boiler operation?( )

A. Furnace.
B. Super-heater.
C. Steam drum.
D. Economizer.

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In a water tube boiler, circulation is developed by the difference in the( )( 1 )tube length and various diameters; (2)densities of the hot and cold water

A. only ( 1 )
B. only ( 2 )
C. both ( 1 )and (2)
D. neither (1 )nor (2)

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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

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( )

In which of the listed components is chemical energy converted to thermal energy with regards to boiler operation?( )

In a water tube boiler, circulation is developed by the difference in the( )( 1 )tube length and various diameters; (2)densities of the hot and cold water

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