單項選擇題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


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題A turbocharged diesel engine will have an intake manifold pressure()

A.constantly decreasing as engine load increase
B.constantly increasing as the amount of supercharging increases
C.approximately equal to exhaust manifold pressure at all times
D.approximately equal to atmospheric pressure at all times

5.單項選擇題A leaking diesel engine fuel injector will cause()

A.prolonged maintenance intervals
B.improved atomization
C.greater fuel economy
D.incomplete combustion