A. All are single head B. Both are double heads C. The former is single head and the latter is double head D. Contrary to C
Problem 2: The driven screw of the three-screw pump is ________. Answer: A
A. Oil pressure drive B. Gear drive C. Active screw meshing drive D. Belt drive
Problem 3: The bypass regulator of the three-screw main oil pump is not suitable for ________. Answer: B
A. Use a safety valve B. Wide range of flow adjustment C. Adjust the working pressure appropriately. D. Shut off valve discharge pressure start
Problem 4: The screw pitch diameter of the three-screw pump is d, and its theoretical flow rate is ________. Answer: C
A. In proportion to d. In proportion to d2 C. In proportion to d3 D. Not related to d
Problem 5: Leakage of a three-screw pump generally occurs mainly in ________. Answer: C
A. At the meshing line B. Shaft seal C. Between the top circle of the screw and the pump casing D. Screw end face clearance
Question 6: The larger the diameter of the general screw pump, the other conditions are unchanged, the volumetric efficiency is ________. Answer: A
A. The higher the B. The lower the C. Not affected D. Is possible
Question 7: Regarding the screw pump, the following statement is wrong ________. Answer: A
A. After the sealing cavity is formed in the working, the pressure is unchanged before communicating with the discharge chamber.
B. If the rated discharge pressure is high, the screw length to diameter ratio is large.
C. Before the oil is discharged after starting, the driven screw is subjected to the axial force directed to the discharge end.
D. When the three-screw pump is working, the follower rod does not push directly by the active screw.
Problem 8: The dynamic sealing surface of the mechanical shaft seal is between ________. Answer: C
A. Moving ring and shaft B. Static ring and end cap C. Moving ring and static ring D. A and B and C
Problem 9: The static and moving rings of the mechanical shaft seal are made of ________ material. Answer: C
A. Hard material (metal, ceramic) B. Soft materials (graphite, plastic, etc.) C. The former A, the latter BD. Contrary to C
Question 10: The following statement about the mechanical shaft seal is ________. Answer: B
A. Automatic compensation of the dynamic sealing surface after wear
B. Suitable for pumps using rolling and plain bearings
C. Generally not suitable for liquids with suspended particles
D. Dynamic and stationary rings must use different materials
Question 11: When the twin-screw pump discharges oil, the driven screw is based on ________. Answer: B
A. Oil pressure drive B. Gear drive C. Active screw meshing drive D. Belt drive
Question 12: The following statement about the outer bearing type twin-screw pump is ________. Answer: C
A. Can transport non-lubricating and liquids containing solid impurities
B. There are four rolling bearings
C. Only one shaft seal
D. Separate bearing lubrication system
Question 13: The following statement about the twin-screw pump is ________. Answer: C
A. Both sealed and unsealed
B. The pump cylinder is unchanged, and different pumps can be used to obtain different flow rates.
C. The driven screw is driven by the pressure screw by the active screw
D. Can be designed to deliver non-lubricating and liquids containing solid impurities
Problem 14: Single screw pump and triple screw pump ________. Answer: A
A. Belong to sealed type B. Belongs to the non-sealed type C. The former A, the latter BD. Contrary to C
Problem 15: Number of threaded heads for single screw pump screws and bushings ________. Answer: C
A. All are single head B. Both are double heads C. Screw single head, bushing double head D. Bushing single head, screw double head
Problem 16: Lubrication of the pin of the single-screw pump universal joint shaft is based on ________. Answer: B
A. Lubricating oil B. Grease C. A or BD. No need for manual lubrication
Problem 17: The hydraulic radial force ________ of the active and driven screws during the operation of the single-suction three-screw pump. Answer: C
A. Unbalanced B. Balanced C. Active screw balance, driven screw imbalance D. Driven screw balance, active screw imbalance
Problem 18: When the three-screw pump driven screw ________, the axial force is directed to the suction port. Answer: C
A. Start B. Idle C. Draining D. Just run the 19th question: The balance piston of the three-screw pump is standing at ________. Answer: A
A. Active screw discharge end B. Driven screw discharge end C. Active screw suction end D. Main and driven screw discharge end
Problem 20: The three-screw pump balances the axial hydraulic pressure without the ________ method. Answer: C
A. Set the thrust bearing B. Bilateral inhalation C. Set the balance hole or balance tube D. Balance piston
Issued by Huangshan Aiken Machinery Manufacturing Co., Ltd., reprinted with http://kpslgb.cn.gongchang.com/news.html, thank you for the exam!
Label: screw pump
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