A centrifugal bilge pump requires priming _____.
A.primarily to lubricate the shaft seals
B.due to the inability of this type of pump to lift water to cover the suction (eye) of the impeller
C.to initially unload the pump by having its head pressure equal to discharge pressure
D.in order to overcome the potential energy of water in the discharge line
第1题
A.screwed
B.welded
C.fastened
D.rotated
第2题
A.separating oil too fast
B.the sensor flushed badly
C.the discharge solenoid value out of order
D.too low heating temperature
第3题
A.a failure of the motor
B.a failure of lubricator
C.a failure of cylinder
D.a failure of fuel pump
第4题
A.TBN of the lubricating oil
B.Temperature of the lube oil
C.Completeness in the mixing of the fuel and air
D.Temperature of the cooling (sea) water
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