更多"The vacuum maintained in the salt w"的相关试题:
[单项选择]When distilling salt water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.
A. to cut down the amount of cooling water needed
B. to prevent an excess amount of cooling water from being discharged to the bilges
C. to supply hot water to the evaporator for more economical operation
D. None of the above is tree
[单项选择]Drinking salt water will （）
A. be safe if mixed with fresh water
B. prevent seasickness
C. promote urine excretion
D. protect against heat cramps
[单项选择]What does salt water draft mean?（）.
A. It means summer draft
B. It means maximum draft
C. It means fresh water draft
D. It means seawater draft
[单项选择]What DOCS SALT WATER DRAFT means?（）.
A. It means summer draft
B. It means Maximum draft
C. It means Fresh Water draft
D. It means Seawater Draft
[单项选择]For proper operation, auxiliary boiler feed water must have which of the following characteristics?（）
A. High oxygen concentration
B. Low pH
C. Proper alkalinity
D. All of the above
[单项选择]The boiler feed water check valves are located on the （）
A. feed pump suction line
B. hot well
C. shell of the feed heater
D. feed lines to the boiler
[单项选择]The heated feed-water entering any flash chamber of a flash-type evaporator will（）
A. vaporize, with the un-flashed water remaining at the temperature at which it entered the flash chamber
B. vaporize, with the un-flashed eater equalizing to the saturation conditions existing in the f lash chamber
C. vaporize, with the remaining water a t a temperature greater than it entered the flash chamber
D. boil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber
[单项选择]The feed water to the boiler will comprise （）.
A. condensate
B. a small amount of make-up feed
C. A and B
D. None of the above
[单项选择]The second stage feed-water temperature and shell absolute pressure in a multistage, flash type, distilling plant is （）
A. higher than the first stage feed-water temperature and absolute shell pressure
B. lower than the first stage feed-water temperature and absolute shell pressure
C. the same as the first stage feed-water temperature and absolute shell pressure
D. not related to the feed-water temperature and absolute shell pressure
[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]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]The water level showing in a boiler water gauge glass is usually （） during working.
A. higher than the actual drum water level
B. equal to the actual drum water level
C. increasing due to steam condensation in the glass
D. lower than actual drum water level
[单项选择]The fresh water generator produces fresh water （）.
A. by cooling sea water
B. by heating sea water
C. by evaporation of sea water
D. by purifying sea water
[单项选择]The oil （） in the discharging water from oil water separator exceeds 15 PPM without alarm, because the coil was burnt out.
A. filter
B. hole
C. pollution
D. content
[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]A water pump can not supply water after startingIt may be caused by （）.
A. closed discharge valve
B. broken pipe line
C. worn shaft
D. both A and B
[单项选择]
If a small electric motor is immersed in salt water it should be （）
(1) washed in fresh water
(2) dried in an oven
A. (1) only
B. (2) only
C. both (1) and (2)
D. neither (1) or (2)
