更多"Diesel engine jacket water is used "的相关试题:
[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]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 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]Coolant can be lost from a diesel engine jacket cooling waster system by leakage from（）
A. cylinder head cracks
B. piping joints
C. pump leaking
D. all of the above
[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]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 in an auxiliary diesel engine cooling system is lower than normal, the probable cause is （）
A. air binding of the engine cooling system
B. a cracked water cooled exhaust manifold
C. blockage in the heat exchanger
D. faulty operation of the thermostat
[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]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]When preparing an engine for water temperature（）
A. should be kept at a proper level by a cooler
B. should be raised to about 80℃ by a heater
C. should be raised gradually
D. should be lowered to about 60℃
[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]（） the engines, the diesel engine is（） used engine on board.
A. Between；more commonly
B. Among；the most commonly
C. Between；not more commonly
D. Among；not the most commonly
[单项选择]The （） engine is used for alternators and sometimes for main propulsion with a gearbox to provide a propeller of between 90 to 120 rpm.
A. four-stroke
B. two-stroke
C. slow speed
D. reversible
[单项选择]Connecting rods in a diesel engine are used to connect the （）.
A. engine to the bed
B. rocker arm to the camshaft
C. crankshaft to the gear train
D. piston to the crankshaft
[单项选择]The （） engine is used for alternators and some times for main propulsion with a gearbox to provide a propeller of between 90 to 120 rpm.
A. four-stroke
B. two-stroke
C. slow speed
D. reversible
