of the diaphragm type
of the centrifugal type
of the positive displacement type
independently driven by electric motors
第1题：
A dirty diesel engine oil filter element can best be detected by ______.
A.visual inspection of the elements
B.the pressure drop across the filter
C.high lube oil sump temperature
D.decrease in oil viscosity from the filter
第2题：
visual inspection of the elements
the pressure drop across the filter
high lube oil sump temperature
decrease in oil viscosity from the filter
第3题：
Lubrication for the main reduction gears used with diesel engines is usually supplied by
A.oil from the main engine sump
B.an independent lube oil system
C.the stern bearing head tank
D.the stem bearing sump tank
第4题：
a dirty lube oil strainer
internal water leaks
an oil suction line restriction
excessive wears of the cooling water pump
第5题：
the filter to operate more efficiently
the lube oil cooler to be bypassed
positive lube oil pump suction to be assured
galvanic action in the cooler to be minimized
第6题：
Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of ______.
A.refrigerant bubbles in the lube oil
B.refrigerant reducing the lube oil viscosity
C.oxidation(氧化) of the lube oil from overheating
D.reducing the floc or cloud point of the oil
第7题：
Absorb erosion of high velocity discharge stream
Seal pump shaft against entry of air
Isolate the discharge side from the suction side
Dampen the turbulent discharge flow
第8题：
One of the most common causes of reduction gear failure is gear wear caused by scoring as a result of
A.surface fatigue of the gears
B.an inadequate lube oil film
C.plastic flow of the gears
D.fretting corrosion from water
第9题：
acid
fuel oil
sediment
water
第10题：
lube oil pump suction line
lube oil pump discharge line
bottom of the lube oil sump
outlet from the lube oil header