單項(xiàng)選擇題One end of a cylinder for a medium or high-speed diesel engine is sealed by the piston and rings, the other end is sealed by the ()

A.crankcase
B.cylinder head
C.valve cover
D.engine frame


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1.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

2.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

3.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

4.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

5.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