更多"If the coolant temperature of a clo"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]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]What is head tank in the closed cooling water system used for?（）
A. for the release of air from the cooling water
B. providing expansion room for heated cooling water
C. a place for implementing water and water treatment agent
D. all of the above
[单项选择]In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）
A. improper venting of the cooling system
B. carrying the expansion tank water level too high
C. a totally clogged impeller in the cooling water pump
D. an incorrectly set cooling system temperature control
[单项选择]If the cooling water temperature and the lube oil temperature in a diesel engine are too high, the cause can be （）
A. a dirty lube oil strainer
B. internal water leaks
C. an oil suction line restriction
D. excessive wears of the cooling water pump
[单项选择]In a closed cooling water system, which of the problems can cause the water pressure to fluctuate?（）
A. An open vent in the cooling system
B. A fouled sea chest
C. A restricted water passage in the engine
D. Air entrained in the cooling water
[单项选择]The cooling water temperature （） over a period of 8 hours, and then shut down.
A. should be gradually increased
B. should be gradually reduced
C. should be constantly kept
D. should be varied up and down
[单项选择]In the closed cooling system, the water （）.
A. is made to circulate out of the system
B. is made to circulate within the system
C. is made circulate within the system
D. is made circulate out of the system
[单项选择]Engine coolant accumulating in the diesel engine lubricating oil can result from a （）
A. low oil pressure
B. high coolant pressure
C. leaking fuel injector
D. cracked cylinder head or liner
[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]Sea water is not used directly as a coolant because of （）.
A. low specific heat
B. high specific heat
C. corrosive action
D. high viscosity
[单项选择]The (auto)ignition temperature is that temperature atwhich（）.
A. no spark or flame is required to ignite gas or vapor
B. a fuel begins to give off explosive vapors
C. a fuel if ignited will continue to burn
D. a 1% mixture of the fuel with air will explode
[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]Progressive flooding is controlled by securing watertight boundaries and（）.
A. transferring water ballast
B. jettisoning cargo
C. pumping out flooded compartments
D. abandoning ship
[单项选择]Constant cooling the various components of diesel engine has a number of functions except for （）.
A. good lubrication
B. low thermal stress
C. good mechanical properties
D. acid corrosion
[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]Piston cooling fins are located（）
A. atop the piston crown
B. beneath the piston crown
C. at the base of the piston skirt
D. inside the cylinder liner cooling water jacket
[单项选择]Prior to getting underway in fresh or brackish water，the Master must（）.
A. log the density of the water
B. secure all overboard discharges
C. take on fresh water ballast
D. clean the sides with fresh water
