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


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1.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

2.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

3.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

4.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

5.单项选择题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

6.单项选择题The ash content of a fuel oil is significant to the operating engineer because it ()

A.is an indication of the amount of noncombustible material present in the oil
B.indicates the quantity of energy released by burning a unit amount of the fuel
C.is useful for determining proper atomization temperatures
D.reflects the overall thermal efficiency of the fuel oil service system

7.单项选择题The shape of a cam on a diesel engine determines the valve’s ()

A.point of opening
B.speed of opening
C.lift from its seat
D.all of the above

8.单项选择题Which of the listed devices could be used as a ring groove tool during preparation for the installation of new rings?()

A.Steel brush
B.Fine emery cloth or steel wool
C.A section of the removed compression ring
D.A case hardened scraper

9.单项选择题The main source of fuel injection system malfunctions is ()

A.improper adjustments
B.contaminated fuel
C.coated fuel lines
D.excessive vibration

10.单项选择题The most crucial time for any bearing with regards to lubrication is ()

A.during low loads
B.after proper oil viscosity is reached
C.during starting
D.after cleaning filters