更多"The pH value of water in a diesel e"的相关试题:
[单项选择]In any diesel engine closed freshwater cooling system, the lowest pressure exists at the （）.
A. jacket water outlet
B. cooling water pump outlet
C. heat exchanger outlet
D. expansion tank atmospheric vent
[单项选择]The expansion tank in a diesel engine closed freshwater cooling system is located at （）
A. the highest point in the system
B. the lowest point in the system
C. near the floor
D. plate level or near the tank top level
[单项选择]The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.
A. reduce water temperature
B. reduce water turbulence
C. provide an air cushion
D. allow for an increase in water volume as the engine warms up
[单项选择]A diesel engine cooling water system with a pH factor of 30 indicates a condition of （）.
A. slight acidity
B. slight alkalinity
C. excessive alkalinity
D. excessive acidity
[单项选择]In a diesel engine cooling water system, a pH of 60 indicates a/an （）.
A. slightly acidic condition
B. slightly alkaline condition
C. overtreatment of water
D. neutral condition of water
[单项选择]High diesel engine cooling water temperatures can be caused by （）.
A. a worn water pump
B. not enough coolant
C. air in the cooling system
D. all of the above
[单项选择]The main propulsion diesel engine jacket water temperature rises above normal, with the raw water sea suction and the expansion tank water level being normalWhich of the following problems is most likely the cause?（）
A. Faulty thermostatic bypass valve
B. Eroded zinc pencils in the heat exchanger
C. Steam formation in the expansion tank
D. Excessive leakage from jacket water pump seal
[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]In a diesel engine jacket water cooler, with seawater cooling the fresh water, the（）
A. sea water temperature must never be warmer than 40℃
B. jacket water pressure should always be greater than the sea water pressure
C. jacket water temperature must always be less than 60℃
D. jacket water pressure must always be less than the sea water pressure
[单项选择]During the diesel engine running, the water level of FW expansion tank should normally kept in the （） level of glass tube.
A. the highest
B. above 3/4
C. 1/2-3/4
D. the lowest
[单项选择]In （）, hot diesel engine jacket water passes over the stack and heats the sea water passing through the tubes.
A. a flash generator
B. a flash evaporator
C. a vacuum boiling evaporator
D. a boiler
[单项选择]In a closed diesel engine freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the （）.
A. suction pressure regulator
B. thermostatic bypass valve
C. sea water temperature
D. water level in the expansion tank
[单项选择]The highest pressure in any closed diesel engine freshwater cooling system is at the （）.
A. jacket water outlet
B. expansion tank inlet
C. heat exchanger inlet
D. cooling water pump outlet
[单项选择]In a four-stroke/cycle diesel engine, after the completion of the power stroke, the piston will move（）
A. up and draw in a fresh air charge
B. down to burn off fuel
C. down to compress the fuel air charge
D. up and force out the exhaust gases
[单项选择]A diesel engine fails to start because of water in the fuelIn order to start the engine, you should （）?
A. turn engine with jacking gear
B. drain filters and strainers and bleed off water at each injection pump
C. use ether to start the engine with blow-down valves open
D. blow through the cylinders and fuel lines with a drying agent
[单项选择]Why the cooling water of the diesel engine should be treated? Because the（）
A. Cooling water is alkalescence
B. cooling water is acidity
C. cooling water has salinity
D. cooling water has impurity
[单项选择]The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by （）
A. regulating the level of corrosion inhibitor in the primary cooling system
B. the level of the freshwater expansion tank
C. varying the engine load to meet temperature requirements
D. the operation of the thermostatic valve
