Diesel engine air start system check valves are opened by （）

单项选择题The cetane rating of diesel fuel is an indication of the （）

A.ignition quality of the fuel
B.calorific value of the fuel
C.flash point of the fuel
D.rate of fuel consumption

单项选择题The condensers located in various stages of a flash evaporator are cooled by（）

A.distillate
B.seawater
C.brine
D.air

单项选择题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

单项选择题By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a（）

A.tachometer
B.pyrometer
C.dynamometer
D.calorimeter

单项选择题To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）

A.Speed limiting governor
B.Over-speed governor
C.Over-speed trip
D.Over-speed relay