更多"In a closed cooling system for a tu"的相关试题:
[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]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]Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.
A. during the valve overlap period
B. with only the exhaust valve open
C. at a pressure below atmospheric
D. without cooling the cylinders or pistons
[单项选择]Lube oil accumulating in the cooling water system of a diesel engine will result in （）
A. lube cooler failure
B. poor heat transfer
C. mechanical lubricator failure
D. camshaft seizure
[单项选择]Cavitation erosion in the cooling water system of a diesel engine usually occurs at the pump impeller, and on the waterside of the （）
A. fuel nozzle holders
B. exhaust value guides
C. engine cylinder liners
D. low temperature and a low viscosity
[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]After-cooling of a turbocharged diesel engine will result in （）
A. higher torque but lower brake horsepower
B. lower torque but higher brake horsepower
C. higher torque and lower brake horsepower
D. lower torque and higher brake horsepower
[单项选择]The piston cooling system may employ similar components, except that （） is used instead of a head tank.
A. a sump tank
B. a feed well
C. a double bottom tank
D. a drain tank
[单项选择]A separate piston cooling system is used to limit any contamination （） piston cooling glands（） the piston cooling system only.
A. between；to
B. either；or
C. from；to
D. neither；nor
[单项选择]In a diesel engine cooling system, the high temperature alarm contact maker will be activated on excessively high water discharge temperature from the （）
A. raw water pump discharge
B. expansion tank outlet
C. cooling water heat exchanger
D. outlet engine jacket water outlet
[单项选择]In a central cooling system, used in some modem ships, sea water is supplied to cool （）which will circulate to other individual cooler, greatly reducing the corrosion problems.
A. fresh water
B. sea water
C. cooling oil
D. emulsion
[单项选择]Lube oil in the fresh water cooling system of a diesel engine may result from a （）
A. camshaft seizure
B. lube oil pump failure
C. lube oil cooler failure
D. lube oil pump overflow
[单项选择]The cooling system（） needs least maintenance work for in this kind of system（）
A. open；the minimum components
B. open；the high cooling efficiency
C. central；there are more coolers and a extra set of pumps
D. central；there is only one component contacts seawater
[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]If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is （）
A. a broken shaft on the freshwater pump
B. an excessive accumulation of scale exchanger
C. an incorrect thermostatic element operating range
D. lube oil in the cooling water
[单项选择]The exhaust system for a turbocharged diesel engine functions to （）
A. power the after-coolers
B. power the turbocharger
C. reduce the cylinder scavenge effect
D. cool the turbocharger
