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


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1.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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題The main source of fuel injection system malfunctions is （）

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