單項(xiàng)選擇題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


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題Main propulsion engine lube oil sumps should be constructed （）

A.so as to never be integral lube
B.with a sloped bottom
C.only of nonferrous, noncorrosive metals
D.with drain/return lines terminating just above or at the designed normal level