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
Question 7: The following statement about the unsealed twin-screw pump is ________. Answer: D
A. Composed of two screws of the same diameter, single-headed spiral, toothed rectangle or trapezoid
B. The active screw and the driven screw are not in direct contact, and there is very little wear.
C. Small spiral angle, self-locking screw, must be driven by synchronous gear
D. Because of its low volumetric efficiency, it can only transport oils with higher viscosity.
Problem 8: The screw of the single screw pump is connected to the drive shaft by ________ connection. Answer: D
A. Rigid B. Elasticity C. Friction clutch D. Cardan shaft
Problem 9: The screw and pump cylinder of a 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
Question 10: 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 11: The three-screw pump solves the axial hydraulic pressure imbalance and does not include ________. Answer: D
A. Balance bushing B. Balance piston C. Thrust washers and spacers D. Balance disk
Question 12: 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 13: Excessive discharge pressure of the three-screw pump does not result in ________. Answer: B
A. Motor overload B. Increased bearing load C. Reduced volumetric efficiency D. Safety valve open
Question 14: 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 15: ________ 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 16: The screw pump is compared with other rotary pumps. The disadvantage is ________. 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 17: 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
Problem 18: 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 19: 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 20: Some of the valve-controlled hydraulic steering gears use a 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 21: Three-screw pumps are generally not used as ________ on board. Answer: D
A. Main engine oil pump B. Steering gear hydraulic pump C. Main engine fuel pump D. Sewage pump
Question 22: 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 23: Single screw pumps are not used as ________ on board. Answer: D
A. Sewage pump B. Sewage pump C. Incinerator pump D. Hydraulic pump
Question 24: 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
Question 31: The method of adjusting the screw pump flow or working pressure is generally adjusted ________. Answer: C
A. Discharge valve B. Suction valve C. Bypass valve D. A or B
Question 32: The reverse use of a common three-screw oil pump will result in ________. Answer: B
A. The active screw radial force cannot be balanced. The axial force of the main and driven screws cannot be balanced. Motor overload D. A and B
Question 33: 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
Problem 34: The incorrect requirement for screw pump management is ________. Answer: D
A. When installing, the center of gravity should pass through the hull of the hull
B. Screw spare parts should be horizontally supported at both ends on the bracket for storage.
C. Should be protected from overheating during use
D. Coupling alignment should be particularly strict
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Screw pump multiple choice questions, will you do it?