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WorksheetsCentrifugal Pump
Total questions: 35
Worksheet time: 14mins
Centrifugal force is the force that
Tends to lift up an object from the ground level
Tends to pull down an object toward the ground
Tends to push an object outward from a rotating centre
The arrow above shows..................
Pump NDE
Pump DE
Pump Rotor
Suction
Choose the correct statement for a volute casing
Volute casing converts pressure energy to velocity energy
The volute shape is used to reduce internal leakage between the high pressure and low pressure areas
The cross section of a volute gradually decreases
Volute casing converts velocity to pressure energy
Which of the following is not a type of impeller
Closed
Diffuser
Semi Open
Open
Which are not the main components of a multi-stage centrifugal pump
Connecting Rod
Balance Piston
Impeller
Shaft
What is the name of the component above?
Mechanical Seal
Volute
Diffuser
Impeller
Which of the following is not the type of impeller?
Split
Semi Open
Closed
Open
Which of the following is not the solution to reduce/eliminate axial thrust?
Balance Piston
Balance Line
Balance Hole
Balance Sleeve
Which of the following is the basic Component in Mechanical Seal?
Rotating Carbon Seal
Diffuser
Impeller
Sleeve
Which of the following is not component of centrifugal pump
Shaft
Impeller
Wearing
Plunger
When the fluid is forced away from the center, or the eye of the impeller, a ____ is created thus resulting to flowing of more liquid.
centrifugal force
positive displacement
vacuum
negative displacement
It is a type of pump casing design that has an offset impeller creating a curved funnel with an increasing cross-sectional area towards the pump outlet which causes the fluid pressure to increase towards the outlet.
vortex
volute
diffuser
rotary
It is used for a wide variety of industrial applications thanks to their increased efficiency and ability to pump fluids at higher pressures.
Multistage centrifugal pumps
Single stage pump
Circulator pump
It is a rotating component of a centrifugal pump that accelerates fluid outward from the center of rotation, thus transferring energy from the motor that drives the pump to the fluid being pumped.
Impeller
Coupling
Shaft
Stuffing Box
Centrifugal pumps can also develop a phenomenon called “cavitation”.
True
False
When the sealing is achieved by means of packing, the chamber is referred to as a ___________.
Stuffing Box
Nozzle
Casing
Seal Chamber
A pump moves fluids from ___ pressure to ____ pressure.
lower, higher
lower, atmospheric
higher, lower
higher, atmospheric
Multistage centrifugal pump consists of two or more __________.
Impellers
Suction head
Pump
Multistage centrifugal pumps have the following two advantages except ______.
to produce a high head
has higher unbalanced thrust and radial forces at off-design flow rates
to produce a large quantity of liquid
Low flow of liquid due to not priming properly cannot lead to overheating of the pump.
True
False
A dead-head is caused when a centrifugal pump operates with no flow through the pump due to a closed discharge valve or blockage in the line.
True
False
Identify part "No. 10" shown in the picture.
Bearing
Packing
Lantern ring
Stuffing Box
Identify the the fault shown in this picture.
Erosion
Cavitation
Corrosion
Evaporation
This opening on the pump is for
cooling
draining
priming
lubrication
Identify the ring next to the impeller.
Wear Ring
Packing Ring
Lantern ring
Coupling Ring
What type of bearing is used in this pump?
Ball
Roller
Thrust
Sleeve
What type of sealing arrangement for pumps is used in nontoxic, nonflammable, and nonpolluting applications?
Mechanical packing
Mechanical seal
Physical seal
Physical packing
How is the amount of head determined in a pump?
By the height of the liquid
By the weight of the liquid
By the viscosity of the liquid
By the temperature of the liquid
Which of the following is contained in the manufacturer's supply performance pump curve for centrifugal pumps?
Head
Flow rate
Efficiency
All of the above
How is efficiency calculated with regards to the performance pump curve?
The efficiency is the maximum flow rate at zero flow.
The efficiency is the ratio of the liquid horsepower to the brake horsepower.
The efficiency is normally based on evaluation with water.
The efficiency is calculated using atmospheric pressure, vapor pressure, liquid height, and pressure drop.
What problem can occur if the valves beyond the pump are incorrectly closed or blocked?
Leakage
Cavitation
Overheating
Overpressurization
What problem can occur when the pressure on the eye of a pump impeller falls below the vapor pressure of the liquid being pumped?
Leakage
Cavitation
Overheating
Overpressurization
Which of the following is a cause of cavitation?
Flow rate too low
Suction pluggage
High liquid level
Decrease in liquid temperature
Which of the following is a consequence of abnormal speed in a pump?
Cavitation
Overheating
Mechanical failure
All of the above
What can cause vibration?
Cavitation
New bearings
Low pump speed
All of the above
