单项选择题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.单项选择题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.单项选择题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.单项选择题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.单项选择题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

6.单项选择题Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the()

A.double bottom fuel oil tank temperature
B.heater supply steam flow
C.pressure of the fuel supplied to the burners
D.attemperator steam flow in the heater discharge circuit

7.单项选择题The construction of the main propulsion engine lube oil sump should ()

A.have no plating joints of 90
B.retain the lube oil as long as possible before it recirculates through the system
C.provided drain/return lines that are no greater than 24 inches from the pump suction
D.be provided with only a perfectly horizontal bottom

8.单项选择题Main engine room control console alarms are to be of the self monitoring type, meaning that an open circuit to a particular alarm circuit will ()

A.cause an alarm condition
B.secure power to the indicator
C.secure power to the monitored device
D.automatically recluse within 10 seconds

9.单项选择题At which of the following locations would a duplex pressure gage most likely be located?()

A.Fuel oil service pump discharge
B.Fuel oil strainer
C.Fuel oil heater
D.Fuel oil flow meter

10.单项选择题The function of lubricating oil is to ()

A.maintain even distribution of bearing wear
B.maintain a constant oil temperature
C.maintain a pressurized film between moving surfaces
D.remove entrained water