On what type of pump would you find an impeller?()
A、Centrifugal
B、Gear
C、Piston
D、Vane
A、Centrifugal
B、Gear
C、Piston
D、Vane
A、There are several types of hatch covers on board ship. B、There are several types of hatches on board ship. C、There is one type of hatches on board ship. D、There is one type of hatch covers on board ship.
A、Absorb erosion of high velocity discharge stream B、Seal pump shaft against entry of air C、Isolate the outlet side from the inlet side D、Dampen the turbulent discharge flow
A、Regulation of discharge pressure from cargo pumps B、Maintaining constant velocity in cargo lines C、Regulation of suction head on cargo pumps D、To maintain a tank or void at atmospheric pressure
A、negative displacement type B、turbine type C、positive displacement type D、mixed-flow type
A、centrifugal pump is cheaper than reciprocating pump B、the size of centrifugal pump with same capacity is smaller than that of reciprocating pump C、centrifugal pump makes maintenance easier than reciprocating pump does D、all of the above