Pumps Level 3 Flashcards
1
Q
What is the over all efficiency of a pump that puts out 500gpm of oil with a s.g. Of .86 against a head of 99 feet if the brake horsepower into the pump is 12 hp?
A
90%
2
Q
What type of pump is best used to pump large volumes of water at low pressure?
A
Propeller pump
3
Q
What does pump selection for handling different materials include?
A
Both the pump material and the pump type
4
Q
What occurs when operating above the fluid to be transferred are operating at higher elevations
A
They are subject to a decreased suction lift
5
Q
Cavitation in the formation and collapse of which condition
A
Vapor formed one the suction line and collapsing on the discharge side
6
Q
What are reciprocating type positive displacement pumps used to handle paints and resins
A
There is less turbulence and foamin
7
Q
What type of pump is used to add specific amount of chemicals to water system
A
Metering
8
Q
What term is given to the distance between the surface of a liquid in the discharge tank?
A
Total static head
9
Q
What is the largest single contributing factor to the reduction of pressure at a pumps impeller
A
Required lift
10
Q
On a mechanical seals the primary seal is between the seal face. Where is the secondary seal?
A
Between the shaft and the rotating member of the seal
11
Q
What is the function of a pump impeller
A
Supply energy to the fluid
12
Q
When the liquid is being pumped is located above the pump, what term is used to describe the action into the pump?
A
Suction head
13
Q
What do flow and Pistons convert mechanical energy into
A
Flow movement
14
Q
What is static suction lift?
A
The height from pump centre to the fluid surface on the suction side
15
Q
What is the volume metric efficiency of a pump that displays 250 in.³ of flow per foot? The actual delivery is 1660 RPM at 1800 RPM.
A
83%
16
Q
Volatile fluid are most safely handled by which of the following pumps
A
Air system driven reciprocating pump
17
Q
If dynamic head is expressed in feet the centrifugal pump,how is it expressed for the positive pumps?
A
Pounds per square inch
18
Q
How can a line shaft turbines obtain high pressure when pumping water?
A
Use multiple stacked bowl
19
Q
Which type of hydraulic pump has the highest pressure capacity?
A
Radial piston
20
Q
Which is not a function of diffuse vanes
A
They add velocity to the fluid
21
Q
How are propeller pumps usually closed
A
Either axial flow or mixed flow
22
Q
What would be the total weight of the fluid in a tank of 40 feet and 10 feet diameter filled with water
A
196036 pounds
23
Q
For a pump curve to be valid what must the available NPSH be
A
At least as large or larger than the required NPSH
24
Q
Gear or vane type positive displacement pumps are more properly known by which term
A
Rotary pump
25
Find the volume of a cylindrical tank 10 feet in diameter and 30 feet long
2356.2
26
What are loads perpendicular to a shaft called?
Radial loads
27
A centrifugal pump produces the same amount of head, regardless of the specific gravity of the liquid being pumped
True
28
What part of the end suction pump direct flow into and out of the pump?
Casing
29
What is the term given to any substance or material that flows under normal conditions?
Fluid
30
In an axil-flow propeller pump, which of the following straightens the flow of the liquid into the discharge pipe
Diffuser vanes
31
When is the proper positioning of an impeller extra critical?
In pumps that are multistage
32
Why is the propeller pump casing diameter designed smaller than the discharge pipe diameter?
To permit easy removal for maintenance
33
A column of fluid is 60 inches high. If the specific weight of the fluid is 60 pounds cubic foot what is the pressure in psi at the base of the column?
2.0784 psi
34
What are the two most commonly used metering pumps
Diaphragm and plunger class
35
Find the weight of fluid which exerts a pressure of 250 psi on the bottom of a tank which has an area of 40 ft.²
1440000 pounds
36
Unlike most mechanically adjustable diaphragm pumps, one design can be adjusted while in operations because of what distinct features
Plunger within the pumps crankshaft
37
To calculate brake horsepower of a pump what must be known?
Hydraulic horsepower and pump efficiency
38
Pressurized boilers condensate is used to create the seal in which type of seal maintenance
Packing less seal
39
Which of the pump load is balanced by a double suction impeller
Axial
40
Convert a pressure head reading of 24HG of feet of oil specific gravity of oil is .75
36.2 feet
41
What is often done to ensure a close fit between the plunger and the body of the pump?
They are lapped
42
What do metal backup plates use in a diaphragm pump prevent
Excessive flexing in the diaphragm
43
Vicious fluid pumps used for pumping high viscosity fluids are also known by what class of pumps
Rotary pump
44
What type of pump is usually used to handle waste water?
Centrifugal
45
Which of the following best describes how double acting pumps discharge fluid
On both the forward/and the return stroke
46
Why are canned motors and magnetic drive pumps utilized when zero liquid leakage is required
There are no seals used because of their enclosed design
47
In an axial position pump, what causes the pumping action
Motion of the piston
48
If a certain pump suction vacuum gage shows 2HG how many psi will push the liquid into the pump
13.72 PSIA
49
Which type of pump load is balanced by a double volute pumping case
Radial
50
Which of the following is not a reciprocating pump
Peristaltic pump
51
Under what conditions do axial flow pumps usually operate
Low head high volume
52
A pressure gage reads 90 psi at sea level. What is the absolute pressure?
104.7 psi
53
Why doesn’t fluid return to the suction side of a gear pump?
Because of the meshing of the gears
54
What is the largest single contributing factor to the reduction of pressure at a pumps impeller
Required lift
55
What do fluid in postions converts mechanical energy into
Flow movement
56
Which is not a cause of cavitation
Too low of viscosity
57
How is flow measured?
Volume per unit of time
58
What does pump selection for handling different materials include
Both the pump material and pump type
59
How do centrifugal pumps produce pressure?
None of the above
60
Which of the following is true of a rotary pump that handles a lubricating material?
No extra means of lubrication is needed
61
Volatile fluids are most safely handled by which of the following pumps
Air or steam driven precipitin pumps
62
Pumps that handle high velocity materials are of what type
Positive displacement
63
Where are the horizontally Split pumps case split
On the shaft centre line
64
Where is a vortex pumps impeller usually positioned
No more than halfway into the case
65
On a cartridge sealed, which component is not located inside a metal housing
Stationary member
66
How can a line shaft turbine, obtain high pressures when pumping water?
Use multiple stacked bowls
67
If you have an 80 gallon tank that is 8 feet in height what is the diameter of the tank?
49.51 inches
68
How are diaphragm in most diaphragm metering pumps actuated
By hydraulic pressure
69
What component does a close couple pump not have
Bearings
70
What is the term given to line shaft turbine bull assembly, and suction Bell?
Together, they are called priming unit
71
What moves the check valve use in precipitating metering pump
The material being pumped
72
How does a pump get the fluid into the suction side?
It creates a void that atmospheric pressure will push the fluid into
73
Why do the internal gear teeth of an internal gear pump mesh smoothly with the extradural gear teeth?
The space of the teeth are equal
74
What kind of impeller is used mainly for pump fluid containing large solid
Open impeller
75
How are propeller pumps usually closed
Either axial-flow or mixed flow
76
Which type of diaphragm pump requires a pressure relief valve
Mechanically operated pump
77
What do metal back up disc plates use in diaphragm pumps prevent
Excessive flexing on the diaphragm
78
Of the following, which is not a requirement of determining a pump capacity
Pump material
79
How is the fluid end of a horizontal pump lubricated
Fluid being pumped
80
How does a maintenance person find the correct packing size for a specific stuffing box
Measure the diameter of the stuffing box shaft then subtract the smaller diameter from the larger and divide by two
81
Centrifugal pump discourage 300 GPM of water against a head of 55 feet with pipe outlet discharge pressure of 20 psi what PSI is required at the pump outlet allowable 15% for friction
47.387 psi
82
Which part of a slurry pump is the most likely to wear?
Valve set
83
High viscosity materials are
Thick
84
When sump pumps are use is a waste pumping system, what are used to keep larger particles from reaching the impeller
Intake scream
85
Adding heat to light cement slurries and glue
Dries them out
86
Repair of solids pumping system is easier if
Replaceable components are used
87
When pump is not running it is said to be in a
Static condition
88
When the pump shut off, the difference between the suction and discharge liquid level is called
Elevation head
89
The sum of the total static head, head loss, and dynamic head is called
TDH
90
To calculate brake horsepower, you need to know the
Liquid horsepower and motor efficiency
91
What of the following is not a basic type of centrifugal pump curve
Speed curve
92
The temperature of the liquid being pumped will effect
Pump capacity and NPSH
93
In which pump is fluid drawn in on both sides of the impeller and discharged through a single outlet
Double suction pump
94
Which of the following statements about close coupled pumps is false
They can only be mounted horizontally
95
What does an impeller in a centrifuge pump do to the fluid being pumped
Throws it
96
A physical separation between the impeller and the casing is maintained by the
Wearing rings
97
Multistage pumps that have high pressure and deliveries usually use special
Thrust bearing
98
Which shaft sleeve material lasts the longest
Stainless steel
99
Which of the following is often used as a booster pump
Can turbine
100
The fluid inside a mixed flow pump
Moves by centrifugal force and by wedging action
101
Pump suction bell and bowl assemblies are usually made of
Cast iron or steel
102
As fluid enters a regenerative turbine pump
Half is sent to each side of the impeller
103
Regenerative turbines pumps cannot be used to pump
Fluids containing solid particles
104
Rotary pumps can handle
Pressures of up to 10,000 psi
105
If gear pump handles a lubricating material
No external means of lubrication is needed
106
In lobe pumps , torque is transmitted by
Timing gears
107
Screw pumps cannot
Handle abrasives
108
In the three screw pump the center screw is
The driving rotor
109
What type of protest pump is suitable for pumping abrasive fluids
Vane
110
Which of the following is not used as a flexible member in a flexible member pump
Piston /roller
111
In a power pump the end that does the pumping is called the
Fluid end
112
Fluid end pistons convert mechanical energy into
Fluid movement
113
In a power pump the device that converts the rotary motion of the crankshaft controlling rod into recirculating motion in the
Crosshead
114
In a vertical plunger pump the pump is connected to a
Movable frame
115
Which way does the piston ring in the air end of an air driven pump face
Away from each other
116
All of the following describe positive displacement metering pumps except
Centrifugal pumps
117
What two capabilities distinguish reciprocating metering pumps from other reciprocating pumps
Accurate flow adjustment zero leakage
118
Most diaphragm metering pumps are actuated by
Hydraulic pressure
119
In a rotary metering pump the position of the pump body is changed by adjusting an
Handwheel
120
Which of the following is not a difficult material to pump
Refined oil
121
Pumps used to handle resins are usually
Centrifugal pumps
122
The capacity of peristalsis pump is determined by the
Tube diameter
123
Which is not a characteristic of the seamless magnetic drive pump
It usually has a large motor
124
Slurry pump impellers have
Widely spaced vanes
125
Centrifugal pumps with suction intakes located above the impeller are primed by
Fluid retained within the pump casing
126
Case of a vortex pump is
Round
127
Sealing devices prevent fluid leakage along the
Drive shaft
128
In a solid stuffing box a small amount of leakage
Is necessary for cooling and lubrication
129
Which arrangement uses fluid to seal the packing and keep air from entering the pump
Injection type stuffing box
130
Which of the following packing materials is used on pumps handling temperature over 450f
Aluminum
131
Packing should be replaced when leakage can no longer be controlled by
Tightening the packing gland
132
Pressurized boiler condensate is used to form the seal in the
Packing seal
133
Which part generally wears out the fastest in a reciprocating pump
Piston ring
