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


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1.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

2.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

3.單項(xiàng)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

4.單項(xiàng)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

5.單項(xiàng)選擇題The relative air pressure in the inlet manifold of a turbocharged diesel engine is usually（）

A.greater than the average exhaust manifold pressure
B.less than the average exhaust manifold pressure
C.greater at the turbine wheel than at the impeller
D.greater at reduced engine speed