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
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相关考题
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单项选择题
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 -
单项选择题
Which of the following problems is the main source of fuel pump and injection system malfunctions?（）
A.Improper lubrication
B.Air in the fuel system
C.Coated fuel lines
D.Excessive vibration -
单项选择题
Which of the following faults would allow lube oil to enter the cooling system of a diesel engine?（）
A.Excessive valve train lubrication
B.Leaking standby oil cooler core
C.Excessive lube oil pressure
D.Excessive lube oil in the system
