by Pumps (Questions)
1)When can a liquid or gas flow through a pipe?
-If the difference between the pressure at the start and end is high enough.
2)What does the type of seal of a pump or compressor depend on?
-pressure flow and medium
3)When would you use positive displacement pump?
-high discharge pressure and low flow
4)What is the purpose of a pump received?
-Accommodating pressure fluctuations.
5)What does a double-acting piston have, which single acting pump dose notes have?
-Additional set of valves.
6)What are diaphragm pumps useful for?
-corrosive liquid
7)Which two pumps are rotating positive displacement pumps?
-Gear pump and vane pump.
8)What is hose pump useful for?
-Corrosive liquid and small flows.
9)What principle in the operation of dynamic pumps based on?
-Velocity is converted to pressure.
10)What dose non-self priming pumps have to contain to operate?
-liquid
11)How can you recognize a turbine pump?
-Several impellers on one shaft.
12)When might you select an axial pump?
-cooling water
13What is positive displacement principle?
-Mechanical energy is converted to pressure energy.
14)What is the total static head of pump or compressor equal to?
-Difference between the discharge and suction pipe.
15)What dose capacity of non-rotating positive displacement pump depends on?
-Speed of rotation and stroke volume
16)What is the difference between piston pump a plunger pump?
-seal location
17)What dose the capacity of a rotating positive displacement pump depend on?
-Speed of rotation and volume of the rotating pocket.
18)Which pump can have both internal external teeth?
-gear pump
19)What can you pump with a progressive cavity pump?
-Suspensions and pastes.
20)What is disadvantage of dynamic pump?
-not-self-priming
21)What dose capacity of centrifugal pump depend on?
-Speed of rotation and impeller shape.
22)What is the NPSH of pump?
-Minimum suction head
23)What is cavitation?
-implosion of vapory bubbles in the discharge pipe
24)Which relationship is shown graphical by the characteristic curve pump?
-Flow and pressure.
25)what is the capacity of the pumps?
-the volume , or amount, of liquid that the pump can move from one point to another in a set amount of time.
26)Write the equation find maximum pump capacity?
-capacity = piston area x length of stroke x full stroke per minute
27)What are four factors that affect the efficiency of the pump?
-Wear of pump parts.
-Viscosity of the pumped liquid.
-Dirty liquid
-The temperature of the pumped liquid.
28)vibration can be cause by:
-suction or discharge problems
-cavitations
29)How we can prevent vibration?
-correct pump construction
-proper motor and pump balancing
-proper use of bearing
30)what the steps must do if the vibration occurs?
-the pump must immediately be stopped
-The cause of the vibration must be found and repaired.
31)What are caused of cavitation?
-A restricted pump inlet (suction closed or suction blocked).
-The pump operating near to its NPSH.
-The liquid being pumped are too hot
-The pump casing is too hot
-The pump discharge valves are blocked in.
-The discharge pressure is too high
32)How we can correct cavitation?
-The NPSH available must be decreased
-The pumping rate must be decreased.
33)Vapour lock can be caused by one or more caused. What are they?
-low liquid level in the vessel being pumped out
-low flow through the pump
-Gases trapped in the suction liquids.
34)How we can prevent gas from entering the pump?
-Raising the suction pressure to the pump.
-Raising the level of liquid in the vessel that is being pumped.
-Degassing (removing the gas from) the suction liquids.
35)What are three properties of a packing seal?
- require attention
- Cheap
- leaks slightly
36)Which pump can you use to handle a paste?
-progressive cavity pump
37)Which three pumps can you use the handle water?
-progressive cavity pump
-vane pump
-hose pump
38)Which pump is suitable 30% hydrochloric acid?
-hose pump
39)What is the function of the diffuser?
-reducing turbulence
40)Which two factors can inverse the likelihood of cavitation?
-hot medium
-higher rotational speed
41)What displacement pumps depend on?
-speed of rotation
-volume of the pockets
1)When can a liquid or gas flow through a pipe?
-If the difference between the pressure at the start and end is high enough.
2)What does the type of seal of a pump or compressor depend on?
-pressure flow and medium
3)When would you use positive displacement pump?
-high discharge pressure and low flow
4)What is the purpose of a pump received?
-Accommodating pressure fluctuations.
5)What does a double-acting piston have, which single acting pump dose notes have?
-Additional set of valves.
6)What are diaphragm pumps useful for?
-corrosive liquid
7)Which two pumps are rotating positive displacement pumps?
-Gear pump and vane pump.
8)What is hose pump useful for?
-Corrosive liquid and small flows.
9)What principle in the operation of dynamic pumps based on?
-Velocity is converted to pressure.
10)What dose non-self priming pumps have to contain to operate?
-liquid
11)How can you recognize a turbine pump?
-Several impellers on one shaft.
12)When might you select an axial pump?
-cooling water
13What is positive displacement principle?
-Mechanical energy is converted to pressure energy.
14)What is the total static head of pump or compressor equal to?
-Difference between the discharge and suction pipe.
15)What dose capacity of non-rotating positive displacement pump depends on?
-Speed of rotation and stroke volume
16)What is the difference between piston pump a plunger pump?
-seal location
17)What dose the capacity of a rotating positive displacement pump depend on?
-Speed of rotation and volume of the rotating pocket.
18)Which pump can have both internal external teeth?
-gear pump
19)What can you pump with a progressive cavity pump?
-Suspensions and pastes.
20)What is disadvantage of dynamic pump?
-not-self-priming
21)What dose capacity of centrifugal pump depend on?
-Speed of rotation and impeller shape.
22)What is the NPSH of pump?
-Minimum suction head
23)What is cavitation?
-implosion of vapory bubbles in the discharge pipe
24)Which relationship is shown graphical by the characteristic curve pump?
-Flow and pressure.
25)what is the capacity of the pumps?
-the volume , or amount, of liquid that the pump can move from one point to another in a set amount of time.
26)Write the equation find maximum pump capacity?
-capacity = piston area x length of stroke x full stroke per minute
27)What are four factors that affect the efficiency of the pump?
-Wear of pump parts.
-Viscosity of the pumped liquid.
-Dirty liquid
-The temperature of the pumped liquid.
28)vibration can be cause by:
-suction or discharge problems
-cavitations
29)How we can prevent vibration?
-correct pump construction
-proper motor and pump balancing
-proper use of bearing
30)what the steps must do if the vibration occurs?
-the pump must immediately be stopped
-The cause of the vibration must be found and repaired.
31)What are caused of cavitation?
-A restricted pump inlet (suction closed or suction blocked).
-The pump operating near to its NPSH.
-The liquid being pumped are too hot
-The pump casing is too hot
-The pump discharge valves are blocked in.
-The discharge pressure is too high
32)How we can correct cavitation?
-The NPSH available must be decreased
-The pumping rate must be decreased.
33)Vapour lock can be caused by one or more caused. What are they?
-low liquid level in the vessel being pumped out
-low flow through the pump
-Gases trapped in the suction liquids.
34)How we can prevent gas from entering the pump?
-Raising the suction pressure to the pump.
-Raising the level of liquid in the vessel that is being pumped.
-Degassing (removing the gas from) the suction liquids.
35)What are three properties of a packing seal?
- require attention
- Cheap
- leaks slightly
36)Which pump can you use to handle a paste?
-progressive cavity pump
37)Which three pumps can you use the handle water?
-progressive cavity pump
-vane pump
-hose pump
38)Which pump is suitable 30% hydrochloric acid?
-hose pump
39)What is the function of the diffuser?
-reducing turbulence
40)Which two factors can inverse the likelihood of cavitation?
-hot medium
-higher rotational speed
41)What displacement pumps depend on?
-speed of rotation
-volume of the pockets
