更多"Sea water is not used directly as a"的相关试题:
[单项选择]Sea water is not directly used as a coolant for engines because of its （）.
A. low specific heat
B. corrosive action
C. high expense
D. acid property
[单项选择]（） is the production of pure water from sea water by evaporation and re-condensing.
A. Evaporation
B. Circulation
C. Condensation
D. Distillation
[单项选择]We use （） to distill fresh water from sea water.
A. engine
B. sea water pump
C. cylinder cooler
D. fresh water generator
[单项选择]After stopping oily water separator, sea water should be permitted for （） minutes,（）should be closed after stopping pump to reduce oxidation corrosion of inner wall.
A. 15；inlet value
B. 15；inlet and outlet value
C. 30；inlet value
D. 30；inlet and outlet value
[单项选择]（）is used to prevent the entry of sea water to the machinery space.
A. A special sealing gland
B. Propeller
C. Tailshaft
D. Sterntube bearing
[单项选择]When distilling sea water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.
A. to decrease scale formation
B. for better cooling effect
C. for more economical purpose
D. to raise vacuum
[单项选择]Diesel engine jacket water is used in the distillation process as the （）.
A. coolant for the distillate
B. coolant for the brine cooler
C. means of heating the feedwater
D. primary means of producing a vacuum within the distiller
[单项选择]Fresh water is used for the cooling of cylinder jackets and （） of the marine diesel engine.
A. cylinder covers
B. lubricating space
C. crosshead
D. exhaust manifold
[单项选择]When water is used to fight a fire on board a ship，the effect of the weight of the water must be taken into account. How much sea water will increase the weight displacement by one ton?（）
A. 64 cubic feet
B. 35 cubic feet
C. 100 gallons
D. 500 liters
[单项选择]The radar control used to reduce sea return at close ranges is the（）.
A. gain control
B. sensitivity time control
C. fast time constant
D. pulse length control
[单项选择]Sea water temporarily pumped into tanks to simulate the increased vertical loading of environmental forces is termed（）.
A. preload
B. liquid variable load
C. fixed load
D. basic load
[单项选择]Oil water separators are used to ensure that ships dont discharge oil when pumping out （）.
A. ballast water
B. boiler water
C. bilge water
D. sewage water
[单项选择]Some sea water came into the wheel house during the voyage due to（）the window thereof.
A. not close
B. not closing
C. we didn't close
D. not to be closed
[单项选择]Biodegradation of the oil slick in sea water is assisted by all the following marine micro-organisms which are capable of metabolising oil compounds except（）.
A. bacteria
B. moulds
C. yeasts
D. seals
[单项选择]In a general oil cooler circulated by sea water, the oil is at a higher pressure, the result being that any leak in the cooler will mean a loss of （）.
A. oil
B. sea water
C. air
D. fresh water
[单项选择]In an oil cooler circulated by sea water, the oil is at a larger pressure, the result being that any leak in the cooler will mean a loss of （）.
A. oil
B. sea water
C. refrigerant
D. fresh water
