單項選擇題Adjustments to the compensating needle valve in a hydraulic governor should be made with the engine at （）

A.maximum power at a normal load
B.maximum power and load under normal conditions
C.half speed and normal temperature
D.normal operating temperature without a load


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1.單項選擇題To guarantee that a reduction gear bearing is receiving proper oil supply, you should check the （）

A.lube oil temperature at the cooler outlet
B.lube oil strainer magnets bearing
C.lube oil temperature
D.lube oil pressure to the bearing

2.單項選擇題In a jerk pump, the amount of fuel that will be forced through the spray nozzle on each upward stroke of the plunger depends on （）

A.the pump supply pressure
B.the slope of the fuel cam
C.how the plunger is rotated
D.the number of sleeve segments engaged with the rack

3.單項選擇題If the jacket water temperature in an auxiliary diesel engine cooling system is lower than normal, the probable cause is （）

A.air binding of the engine cooling system
B.a cracked water cooled exhaust manifold
C.blockage in the heat exchanger
D.faulty operation of the thermostat

4.單項選擇題One result of operating a diesel engine at light load with excessively low cooling water temperature is a/an （）

A.decrease in ignition lag
B.increase in fuel economy
C.reduction in lube oil viscosity
D.increase in cylinder misfiring

5.單項選擇題The plunger in a jerk pump is rotated until the release port is uncoveredIf the port remains uncovered all of the time, which of the listed operations will occur?（）

A.No fuel will be delivered
B.The maximum effective stroke will be attained
C.The fuel delivered to the cylinder will be excessive
D.The injection nozzle will overheat and carbonize