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


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1.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

2.单项选择题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.单项选择题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.单项选择题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.单项选择题A leaking diesel engine fuel injector will cause()

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

6.单项选择题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

7.单项选择题A sudden decrease in the diesel engine lube oil viscosity could be an indication of()

A.loss of additives from the lube oil
B.carbon deposits in the lube oil
C.excessive centrifuging
D.excessive fuel dilution

8.单项选择题Dirt lodged on the nozzle valve seat of a fuel injection nozzle will cause()

A.erosion and cratering of the nozzle orifices
B.fuel leakage into the nozzle drain line
C.fuel leakage before and after injection
D.insufficient fuel delivery though that nozzle

9.单项选择题Diesel engine cylinder head test cocks are used to ()

A.check cylinder lubrication
B.connect the pressure indicator pressure
C.test cylinder heads
D.connect the exhaust gas pyrometers

10.单项选择题Which of the following statements is correct regarding a turbocharged four-stroke/cycle diesel generator?()

A.At zero load the intake manifold pressure is greater than the exhaust manifold pressure
B.At full load the intake manifold pressure and exhaust manifold pressure are equal
C.At full load the intake manifold pressure is less than the exhaust manifold pressure
D.At full load the intake manifold pressure is greater than the exhaust manifold pressure

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