Pumps - Q&A Flashcards
The purpose of the lantern ring is to
a) prevent water from getting into the stuffing box
b) prevent water from getting between the shaft and shaft sleeves
c) distribute lubrication to the packing
d) seal the low-pressure zone from the high-pressure zone
c) distribute lubrication to the packing
What is an instrument that measure pump shaft speed?
a) tachometer
b) o-rings
c) lantern ring
d) odometer
a) tachometer
Which one of the following devices is used to measure water depths in storage facilities:
a) transducer
b) venturi meter
c) magnetic sensor
d) thermistor
a) transducer
…. I think
If centrifugal pump bearings are excessively hot, this is caused by:
a) over lubrication
b) speed too slow
c) worn impeller
d) worn packing
a) over lubrication
The level of wastewater can be measured by:
a) bubblers
b) electrical probes
c) floats
d) all of the above
d) all of the above
… check
All of the following cause bearing failure, but which one is the major cause of bearing failure:
a) poor lubrication practices
b) contamination
c) vibration
d) faulty mounting
a) poor lubrication practices
Packing replacement is done when
a) water leakage sprays out of the pump housing
b) no further tightening can be done on the packing gland
c) the packing gland bolts are exposed by more than 2 1/2 inches above the nut
d) both a and b
d) both a and b
a) water leakage sprays out of the pump housing
b) no further tightening can be done on the packing gland
As water flows through the volute, the pressure head ____ and the velocity head ____
a) increases, increases
b) decreases, decreases
c) decreases, increases
d) increases, decreases
d) increases, decreases
As water flows through the volute, the pressure head increases and the velocity head decreases
The main purpose of mechanical seals is to:
a) keep lubrication in and dirt and other foreign materials out
b) control water leakage
c) keep lubrication grease in the seal
d) hold the packing onto the shaft sleeve
a) keep lubrication in and dirt and other foreign materials out
Open impellers are usually used to pump water that contains ____
a) large solides
b) any chemicals except acids
c) alkaline chemicals only
d) viscous polymers
a) large solides
The purpose of the shaft’s sleeves is to protect the shaft from:
a) wear
b) corrosion
c) erosion
d) all of the above
d) all of the above
Lubrication has the purpose(s) of
a) removing heat and reducing friction
b) preventing corrosion
c) reducing wear
d) doing all of the above
d) doing all of the above
What is the only type of pump that can be operated against a closed valve?
a) vertical turbine pump
b) centrifugal pump
c) axial-flow pump
d) mixed-flow pump
b) centrifugal pump
