單項(xiàng)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


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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)選擇題If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will （）

A.have a larger than normal dead band
B.produce excessive speed response to a load change
C.respond slowly to any change in engine load
D.stabilize engine speed at the new governor setting

4.單項(xiàng)選擇題The double bottom in a vessel is a space comprised of （）

A.plating forming the engine room tank top
B.doubler plating installed over the flat keel plate
C.a watertight boundary formed by the inner bottom
D.compartments between the inner and outer bottoms

5.單項(xiàng)選擇題The lowest temperature at which fuel combustion becomes self-sustaining in the presence of a source of ignition, is defined as the （）

A.auto-ignition point
B.flash point
C.burning temperature
D.fire point