更多"Diesel engine waste heat boiler con"的相关试题:
[单项选择]In the construction of a diesel engine, what is the purpose of end plates?（）
A. To provide accessibility to the cylinder liners
B. To add stability to the engine block
C. To add rigidity to the block and a surface for attaching other parts
D. To make a surface for the base
[单项选择]A waste heat boiler is installed on some diesel propelled vessels to （）.
A. provide steam for emergency propulsion
B. provide steam for the turbo-generator
C. heat the waste water tanks
D. steam for warming engines
[单项选择]A SECONDARY function of a waste heat boiler is to （）.
A. reduce engine exhaust noise
B. reduce engine back pressure
C. increase engine cycle efficiency
D. increase turbocharger efficiency
[单项选择]The PRIMARY function of a waste heat boiler is to （）
A. reduce engine exhaust noise
B. reduce engine back pressure
C. recover heat which otherwise would be lost
D. increase turbocharger efficiency
[单项选择]Generating tubes in waste heat boilers are finned to （）.
A. reduce gas flow turbulence
B. prevent exhaust gas corrosion
C. increase the rate of combustion
D. increase the rate of heat transfer
[单项选择]The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust （）.
A. gas composition
B. gas temperature
C. pressure
D. timing
[单项选择]The purpose of designing some waste heat boilers with sinuous fire tubes, is to（）
A. increase exhaust gas velocity through the boiler
B. reduce accumulations of carbon deposits on the heat transfer surfaces
C. eliminate exhaust gas pulsations and noise
D. increase the rate of heat transfer to the waterside
[单项选择]An exhaust gas bypass is installed on a waste heat boiler in order to （）.
A. bypass exhaust gas at high loads to prevent excessive back pressure
B. bypass a portion of the exhaust gas at peak loads for better efficiency
C. recycle exhaust gas to the turbocharger
D. minimize moisture condensation in the boiler gas passages at low loads
[单项选择]The interior of some diesel engine saltwater heat exchangers are protected from corrosion by the use of（）
A. aluminum plates
B. lead cathodes
C. copper baffle plates
D. sacrificial zincs
[单项选择]In a diesel engine, offers the heat energy directly（）； works as working medium and changes the heat energy to mechanical energy（）
A. the burning of the fuel； medium shaft
B. fuel spray； fresh air
C. fuel； fuel spray
D. the burning of the fuel； the burned gas mixture
[单项选择]In a diesel engine, the time taken to heat the fuel particles, turn them into vapor, and bring about combustion is called （）
A. injection lag
B. ignition delay
C. compression
D. turbulence lag
[单项选择]As a heat engine,（） energy is the source of power by which the diesel engine can be operated.
A. electric
B. heat
C. mechanical
D. exhaust
[单项选择]A （） boiler is an auxiliary boiler sometimes included in a steamships installation for supplying steam to auxiliaries in port.
A. monkey
B. donkey
C. waste heat
D. main
[单项选择]The （） can tell us how much heat we can get from the burning of an oil.
A. viscosity
B. flash point
C. cetane number
D. calorific value
[单项选择]A donkey boiler is （）.
A. one to supply steam to the main propulsion turbine
B. an auxiliary boiler
C. A and B
D. neither A nor B
[单项选择]Engine coolant accumulating in the diesel engine lubricating oil can result from a （）
A. low oil pressure
B. high coolant pressure
C. leaking fuel injector
D. cracked cylinder head or liner
[单项选择]The brickwork surrounding the firebox of a boiler is known as（）.
A. refractory
B. the screen wall
C. the water wall
D. fire plate
[单项选择]The boiler feed pump discharge pressure is higher than the steam drum pressure to （）.
A. ensure feed water flow into the boiler
B. keep the steam drum pressure high
C. prevent water hammer in the feed line
D. help the feed water flash to steam
