更多"Improper maintenance of an automati"的相关试题:
[单项选择]The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler （）
A. salinity is abnormally high
B. steam demand is too high
C. water level is abnormally low
D. feedwater flow is low
[单项选择]Which action should be taken when an auxiliary boiler in is operation?（）
A. Clean all electrical connections
B. Lift the relief valves by hand
C. Inspect and clean all solenoid valves
D. Inspect for oil and water leaks
[单项选择]Improper maintenance of the fuel oil burners in an automatically fired auxiliary boiler, could result in （）
A. increased fuel consumption
B. increased feed water consumption
C. fuel pump failure
D. combustion control system failure
[单项选择]An auxiliary reservoir for starting auxiliary engines should be kept at （）.
A. low pressure at all times
B. full pressure at all times
C. low pressure at intermittence
D. full pressure at intermittence
[单项选择]Electrically operated safety devices on auxiliary diesel engines function to stop the engine by （）.
A. increasing the volume of intake air
B. shutting off the fuel supply
C. increasing the engine back pressure
D. over-speeding the engine
[单项选择]Auxiliary machinery covers everything onboard except （）.
A. main engines
B. main boilers
C. pipes and fittings
D. A and B
[单项选择]Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits may cause （）.
A. low compression pressure
B. increased piston wear
C. increased cylinder lube oil consumption
D. poor contact between compression rings and liner
[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]Auxiliary diesel engines can be automatically shut down as a result of （）
A. low lube oil temperature
B. low lube oil pressure
C. high exhaust temperature
D. high cooling water pressure
[单项选择]For auxiliary engines the permissible overload is （） for one hour every twelve hours.
A. 10%
B. 15%
C. 20%
D. 25%
[单项选择]Oxygen corrosion in auxiliary boilers is prevented by treating the boiler feed tank with either sodium （）
A. sulfite or hydrazine
B. sulfite or hygroscopic sulfite
C. bromide or hydrazine
D. bromide or hygroscopic sulfite
[单项选择]The procedures recommended for auxiliary boilers having high salinity include （）.
A. treating with oxygen scavengers
B. securing the boiler and giving it a blowing down
C. increasing the pH
D. reducing the phosphate level
[单项选择]Flame failure in an automatically fired auxiliary boiler can from a/an （）
A. incorrect electrode setting
B. incorrect nozzle position
C. clogged fuel nozzle
D. broken high tension lead
[单项选择]Auxiliary boilers are divided into several classifications, one of which is（）
A. fire-tube controlled circulation
B. fire-tube supercritical circulation
C. water-tube natural circulation
D. water-tube express circulation
[单项选择]The soot blowers are operating in the oil fuel boiler the air/fuel ratio must （） throughout the action, and blowers greased after use.
A. be increased
B. be decreased
C. remain constant
D. either be increased or remain constant
[单项选择]If the turbocharger failed on an auxiliary diesel engine, which of the following conditions would probably occur?（）
A. Full power cannot be developed
B. The exhaust will contain black smoke
C. Complete combustion will be impossible
D. All of the above
[单项选择]Bottom blow valves are installed on auxiliary water-tube boilers to （）
A. remove suspended and precipitated solids from the boiler water
B. completely drain the boiler in an emergency situation
C. prevent hardened scale deposits in the water drum
D. remove floating impurities from the oily water surface
