5 - 6B Flashcards
The pump that has 3 moving parts, a power rotor, and two idler rotors is:
Screw pump
In gear pumps the liquid is carried:
Between the teeth and pump casing
The pump with no moving parts is the:
Jet pump
The energy which a body or system of bodies has by virtue of stresses, or the energy of position is:
Potential energy
The cross section of the passage into which the water is discharged by the impeller of a volume pump gradually ______ in area as the discharge opening of the pump is approached
Increases
Multistage centrifugal pumps are used where the discharge head is:
High
An impeller that has a side wall or shroud on each side of the canes is classified as:
Closed
The clearance between the rotating and stationary rings of a centrifugal pump is normally_____of and in.
0.012 to 0.020
All centrifugal pumps are equipped with stuffing boxes or mechanical seals to prevent leakage through the clearance between the :
Pump shaft and casing
I’m stuffing boxes where the packing is places on both sides of the lantern ring, the water is called?
Seal water
One of the most common causes of centrifugal pump trouble is:
Leaking stuffing boxes
The static force exerted by a column of water on one foot high on an area of one square inch is:
.434 psi
The relation between capacity, rotaries speed and head developed by an impeller is called:
Specific speed
The _____ indicates the ratio, expressed in %, of useful output to the input, at different capabilities and heads.
Efficiency curve
The frictional heat released in pumps is normally carried away by:
The liquid leaving the pump discharge
The term specific speed relates more to the casing design and less to the impeller?
True/False
FALSE
A 90 degree pipe bend has as much friction as _____ ft of straight pipe
16 ft
Reciprocating pumps are:
Positive displacement
The addition of energy to a liquid to move it from one point to another is called?
Pumping
The faces of mechanical seals are held together by?
Springs
