更多"If the jacket water temperature in "的相关试题:
[单项选择]If the jacket water temperature of an operating diesel engine suddenly rises above normal, the cause can be attributed to （）.
A. an overfilled expansion tank
B. excess chromate treatment of the jacket water
C. a clogged raw water sea suction
D. cavitation erosion of the heat exchanger tubes
[单项选择]If the jacket water temperature rises rapidly above normal in a diesel engine, you should FIRST （）
A. place standby cooler in operation
B. reduce engine load
C. check thermostatic valve
D. clean sea water strainer
[单项选择]About the jacket water, that of the auxiliary engines usually（） is circulated by pumps, and the main engine usually （）
A. an engine-driven；as well
B. an engine-driven；has an independent pump
C. an independent；as well
D. an independent；has an engine-driven pump
[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
[单项选择]Higher than normal jacket water temperatures occurring in all cylinders of a diesel engine can result from a/an （）.
A. oil suction line restriction
B. correct amount of coolant
C. cavitation erosion in the water jackets
D. clogged sea suction strainer
[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]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]The temperature at which water vapor in the atmosphere begins to condense is called the （）.
A. dew point temperature
B. condensation temperature
C. psychometric temperature
D. absolute humidity temperature
[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]In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?（）
A. The safety valve escape piping should be disconnected from the valve body and a blank inserted
B. The boiler vent valves should be opened
C. All hand-hole/manhole covers should be tightened up as much as possible to preclude any leaks
D. All of the above
[单项选择]Starting air for auxiliary engines may be taken directly from the main reservoirs or through （）.
A. an auxiliary reservoir
B. a controlling air bottle
C. an emergency air compressor
D. a main air compressor
[单项选择]Temperature control valves installed in the jacket cooling water system of a diesel engine modulates the rate of water flow through the （）.
A. cooling water pump
B. nozzle cooling passages
C. cylinder jackets
D. heat exchanger
[单项选择]In an auxiliary boiler steam and water system, the highest pressure will be in the （）.
A. steam stop valve
B. dry pipe
C. feedwater system
D. generating tubes
[单项选择]If an operating auxiliary boiler has a water pH reading of 7, you should （）.
A. bottom blow the boiler
B. treat the water with caustic soda
C. treat the water with chemical scavengers
D. reduce the water alkalinity to recommended readings
[单项选择]If an auxiliary diesel engine temperature is higher than normal ,but the thermostat is determined not to be defective you would suspect a /an （）
A. cavitation erosion in the water jackets
B. excess corrosion inhibitor in the coolant
C. dirty jacket water cooler
D. defective turbocharger
[单项选择]CFC refrigerants exposed to high temperature or direct flame, will decompose and may produce（）
A. methyl chloride
B. ammonia
C. hydrofluoric acid
D. ozone
