Do a multiple choice to deepen the understanding of the screw pump

Problem 1: The majority of the axial thrust of the three-screw pump active screw is balanced by ________. Answer: C

A. Thrust bearing B. Balance bushing C. Balance piston D. Thrust washers and spacers

Problem 2 : Compared with the double-side suction and single-side suction type screw pump with the same rotor diameter and speed, the following items: I. hydraulic axial force self-phase balance, II. large flow, III. can increase the rated discharge pressure, the correct one is________. Answer: B

A. I B. I, II C. I, III D. I, II, III

Question 3: The so-called sealed screw pump refers to its ________. Answer: D

A. The pump casing is particularly tight

B. The motor and pump are in the same sealed housing

C. The volumetric efficiency of the pump is quite high

D. The screw meshing line is continuous, which can completely separate the suction and discharge chambers.

Problem 4: The working length of the screw of the three-screw pump is usually not less than (1.2 to 1.5) times the lead, mainly to achieve sufficient

________. Answer: D

A. Strength B. Lift C. Inhalation performance D. Volumetric efficiency

Question 5: Vertical three-screw pumps often have a suction port in the middle of the pump for ________. Answer: D

A. Easy to install B. Easy to manufacture C. Increase the allowable vacuum. D. Pump the internal memory after parking to prevent dry rotation when restarting

Question 5: The advantages of mechanical shaft seals do not include ________. Answer: D

A. Less leakage B. Low frictional power consumption C. Long service life D. Low price

Question 6: The following statement about the internal bearing type twin-screw pump is ________. Answer: D

A. Only lubricating liquid can be delivered B. There are four rolling bearings C. Only one shaft seal D. Separate bearing lubrication system

Problem 7: The connection of the screw of the single screw pump to the drive shaft is generally ________ connected. Answer: D

A. Rigid B. Elasticity C. Friction clutch D. Cardan shaft

Question 8: The screw and pump cylinder of the single screw pump are ________. Answer: D

A. Made of rubber B. Made of metal C. The former A, the latter B D. Contrary to C

Problem 9: The liquid pressure balance device of the three-screw pump is often used ________. Answer: D

A. Balance hole B. Balance tube C. Balance disc D. Balance piston

Question 10: The three-screw pump solution to the axial hydraulic pressure imbalance does not include ________. Answer: D

A. Balance bushing B. Balance piston C. Thrust washers and spacers D. Balance disk

Question 11: Balanced axial thrust is mainly based on ________. Answer: D

A. Set thrust bearing B. Set the balance piston C. Set the balance bushing D. Use two equal length reverse threads

Question 12: Excessive discharge pressure of the three-screw pump will not cause ________. Answer: B

A. Motor overload B. Increased bearing load C. Reduced volumetric efficiency D. Safety valve open

Question 13: The ________ loss of the screw pump is small and almost negligible. Answer: B

A. Volume B. Hydraulic C. Machinery D. A and B and C

Question 14: ________ is not included in the characteristics of the screw pump. Answer: A

A. The rotor is rigid. B. Good inhalation performance C. No trapped oil phenomenon D. Suitable for a wide range of viscosity

Question 15: Compared with other rotary pumps, the screw pump has the disadvantage of ________. Answer: D

A. Has dry suction capacity, but should not be dry

B. Flow range is not as wide as gear pump

C. Sensitive to fluid viscosity changes

D. Poor rigidity of moving parts

Question 16: Single screw pump compared to three screw pump ________. Answer: B

A. The pump cylinder is made of rubber and has high volumetric efficiency. Less sensitive to impurities C. Rated discharge pressure is high D. Unsealed

Question 17: The working life of the screw pump is longer than that of the gear pump mainly because of ________. Answer: D

A. The material used is good B. Radial force balance C. Deliver cleaning oil D. Main and driven screws do not rely on mechanical meshing transmission

Question 18: The main reason for the main diesel engine to use the screw pump as the lubricating oil pump is ________. Answer: D

A. Uniform supply of liquid B. Applicable work pressure is high C. Good inhalation performance D. Reliable work, rarely need to be repaired

Question 19: Some of the valve-controlled hydraulic steering gears use the three-screw pump as the main oil pump because of ________. Answer: D

A. Large and uniform flow, suitable for high pressure B. Good inhalation performance C. Reliable work, rarely need to repair D. A and C

Question 20: The three-screw pump is generally not used as a ________ on board. Answer: D

A. Main engine oil pump B. Steering gear hydraulic pump C. Main engine fuel pump D. Sewage pump

Question 21: The three-screw pump can be used as the main pump for the ________ hydraulic system. Answer: B

A. Pump control type B. Valve control type C. A or B D. Can only be used as an auxiliary pump

Question 22: Single screw pumps are not used as ________ on board. Answer: D

A. Sewage pump B. Sewage pump C. Incinerator pump D. Hydraulic pump

Question 23: Single screw pumps are often used as ________ on board. Answer: D

A. Lubrication pump B. Oil pump C. Boiler feed pump D. sewage pump

Question 24: The single-screw pump is most suitable as the oil-water separator feed pump mainly because of ________. Answer: B

A. Self-priming ability B. The conveying process is light to the liquid. C. High efficiency D. Low price

Question 25: The most uniform flow in the following pumps is ________. Answer: C

A. Gear pump B. Vane pump C. Screw pump D. Reciprocating pump

Question 26: The rated head (or discharge pressure) of the following pumps is independent of the speed of ________. Answer: A

A. Screw pump B. Vortex pump C. Centrifugal pump D. Water ring pump

Question 27: In order to prevent the discharge pressure from being too high, the pump that must be installed with the safety valve is ________. Answer: D

A. Reciprocating pump B. Gear pump C. Screw pump D. A and B and C

Question 28: The following pumps can be used to transport water ________. Answer: D

A. Gear pump B. Vane pump C. Three screw pump D. Single screw pump

Question 29: The reason for the excessive noise of the screw pump does not include ________. Answer: D

A. Low oil absorption temperature B. Coupling alignment is not good C. Leakage of the suction pipe D. High discharge pressure

Question 30: The screw pump regulates the flow rate usually adjusted by ________. Answer: B

A. Throttling B. Reflux C. Variable speed D. Volume

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Label: screw pump
'Do a multiple choice to deepen the understanding of the screw pump

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