The pressure head of a pump is given in the unit of （）.

After installing a new hydraulic pump in a system, what special attention should be given to the hydraulic system?

A.The relief valves in the system should be readjusted

B.The filters and strainers should be checked frequently

C.All system pressure should be readjusted

D.The system should be drained and renewed with a fluid of different operating characteristics

If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably ______.

A.excessive pump speed

B.excessive suction head

C.worn wearing rings

D.gross pump misalignment

Which of the following terms is used to identify the pressure of the liquid entering a pump?

A.Suction head

B.Pump head

C.Discharge head

D.Total head

Which statement is TRUE concerning cargo hose on tank barges ________．

A.Cargo hose must be able to withstand the shut-off head plus the static head of the cargo pump

B.Cargo hose must be able to withstand the static head of the cargo pump but no less than 100 psi

C.Cargo hose must be able to withstand the shut-off head less the static head of the cargo pump but no less than 100 psi

D.Cargo hose must be able to withstand at least 150 psi

The pressure of a liquid leaving the pump can be referred to as the ______.

A.total head

B.discharge head

C.net positive suction head

D.suction head

Cargo pump relief valves are piped to the ______．

A.cargo pump pressure gauges

B.crossover lines interconnecting two pumps

C.suction side of pumps

D.atmosphere through pump vents

Which statement is NOT true?

A.In a simple vane pump, the rotor and cam ring are exactly concentric

B.Balanced vane pump has an elliptical cam ring

C.Liquid in both gear pump and vane pump are forced out to the outlet.

D.Balanced vane pumps can work at a higher pressure than the simple vane pump

You start a centrifugal cargo pump to discharge cargo．The pump works for a while and then loses suction．This could be caused by ______．

A.The pump running backwards

B.Incomplete priming

C.The discharge head being too high

D.All of the above