更多"Which of the substances listed is s"的相关试题:
[单项选择]Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?（）
A. Carbon particles
B. Lube oil
C. Gasoline
D. Diesel fuel
[单项选择]A centrifuge will satisfactorily remove which of the following contaminants from fuel oil?（）
A. Gasoline
B. Water
C. Lubricating oil
D. sulphur compounds
[单项选择]Which of the listed substances can be satisfactorily removed from diesel fuel by centrifuging?（）
A. Sludge
B. Gasoline
C. Fuel oil
D. Lube oil
[单项选择]Basically the bedplate consists of two （）, which run the length of the engine.
A. longitudinal girders
B. transverse girders
C. fore girders
D. aft girders
[单项选择]Which of the listed refrigeration system components keeps the refrigerant circulating through the system?（）
A. Expansion valve
B. Condenser
C. Evaporator
D. Compressor
[单项选择]Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?（）
A. Sensitivity
B. Power
C. Speed droop
D. Compensation
[单项选择]Which of the routine maintenance procedures listed is required for starting air receivers?（）
A. over-speeding
B. overload
C. low exhaust temperature
D. high crankcase pressure
[单项选择]Which of the listed statements is a characteristic of the liquid charged power element used with thermostatic expansion valves?（）
A. At the designed operating temperature, the liquid refrigerant charge has changed to a vapor
B. The liquid refrigerant tends to collect at the bellows or diaphragm and reduces the valve sensitivity
C. The sensing bulb is empty of liquid refrigerant charge at the designed operating temperature
D. The sensing bulb is never emptied of liquid refrigerant under normal operating conditions
[单项选择]Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?（）
A. Pressure-reducing valve
B. Unloading valve
C. Counterbalance valve
D. Pressure-relief valve
[单项选择]Which of the listed effects represents the purpose of heat treating steel?（）
A. Develop ductility
B. Improve machining qualities
C. Relieves stresses
D. All of the above
[单项选择]In which of the listed refrigeration system components does superheating of the refrigerant take place?（）
A. Expansion valve
B. Evaporator
C. Drier
D. Receiver
[单项选择]Which of the listed materials would be considered as a bunting class "C" fire?（）
A. Fuel oil
B. Wood
C. Celluloid
D. Electrical insulation
[单项选择]Which of the listed statements is correct concerning refrigeration systems?（）
A. Dehydrators must be used continuously in a refrigeration system
B. A 25 ton refrigeration system has the same cooling effect as melting 25 tons of ice in 24 hours
C. A thermostatic expansion valve is used to control refrigerated space temperature
D. The liquid receiver functions to collect and remove non- condensable gases
[单项选择]Which of the statements listed concerning heat transfer is correct?（）
A. Heat is always transferred at a constant rate
B. Heat transfer rate increases as temperature difference increases
C. The rate of heat transfer is not affected by temperature difference
D. The high temperature region is known as a heat sink
[单项选择]Which of the processes listed consumes the greatest amount of power while producing the greatest amount of heat?（）
A. Overcoming sliding friction
B. Overcoming rolling friction
C. Overcoming fluid friction
D. Overcoming oil wedge friction
[单项选择]Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?（）
A. Lube oil passing through the system
B. Moisture or foreign matter collecting at the valve seat and orifice
C. Variable spring tension caused by the changing temperature
D. Frost on the liquid line
[单项选择]Which of the engine components listed increases air charge density and helps to improve engine operating efficiency?（）
A. Intake manifold
B. Water-cooled exhaust system
C. After-cooler
D. Exhaust diffuser
[单项选择]Which of the combustion parameters listed is used in a diesel engine, but NOT related to the injection system?（）
A. Atomization
B. Metering
C. Effective stroke
D. Penetration
[单项选择]Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
A. Impeller
B. Compressor
C. After-cooler
D. Exhaust differ
