A.once each crankshaft revolution
B.twice each crankshaft revolution
C.every other crankshaft revolution
D.every fourth stroke
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A.They are less expensive
B.They are smaller for equivalent pumping ability
C.They pump more cargo in less time
D.All of the above
A.cargo pump pressure gauges
B.crossover lines interconnecting two pumps
C.suction side of pumps
D.atmosphere through pump vents
A.advance
B.cavitation
C.edging
D.slip
A.a not knowing
B.an unknowing
C.an unknown
D.a not known
A.brake
B.devil's claw
C.pawls
D.All of the above
最新試題
The most common type of davit found on merchant vessels today is the（）.
Each cylinder in a two stroke cycle engine experiences combustion（）.
Permission is kindly requested（）the ballast water.
Centrifugal pumps have what advantage(s) over reciprocating pumps?（）.
Cargo pump relief valves are piped to the（）.
In relation to cargo gear，what does SWL mean?（）.
In ship construction，frame spacing is（）.
As the propeller turns，voids are formed on the trailing and leading edges of the propeller blades causing a loss of propulsive efficiency，pitting of the blades，and vibration. These voids are known as（）.
Limit switches are used on which davits?（）
On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.