單項(xiàng)選擇題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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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題Problems with the diesel engine fuel injection pump are usually caused by()

A.improper adjustment
B.contaminated fuel
C.kinked fuel lines
D.excessive engine vibration

5.單項(xiàng)選擇題Diesel engine cylinder head test cocks are used to()

A.check cylinder lubrication prior to starting engine
B.connect exhaust gas analyzers to determine engine efficiency
C.pressure test cylinder heads to check for leaks
D.remove moisture accumulations from cylinder prior to starting