辅机（Auxiliary machine ）

1、辅机3（Auxiliary machine 3）The first problem: the gear pump is not suitable for water is mainly because of _.A. leakage is seriousB. efficiency is too lowC. wear badlyD. corrosion is seriousAnswer: CSecond questions: the following statements about: 1. The steering gear pump, II suction depends on the d

2、irection of the gear meshing gear. One side exit and discharge pipe, which _.A. I's rightB. II is correctC., I and II are correctD., I and II are incorrectAnswer: AThe third problem: the main internal gear pump leakage occurred in _.A. gear clearanceB. addendum clearanceBetween the meshing teeth

3、 of C.D. shaft sealAnswer: BThe fourth problem: the general external gear pump has _.A.2 only rolling bearingsB.4 only rolling bearingsC.2 only plain bearingsD.4 only plain bearingsAnswer: BThe fifth problem: gear pump bearing lubrication usually rely on _.A. quote oil from the discharge endB. oil l

4、eakage in the end clearanceC. with greaseD. use lubrication free bearingsAnswer: BThe sixth problem: oil _ lubrication gear pump bearing.A. comes from the oil leak in the top clearance of the teeth through the suction portB. comes from the oil leakage in the gear end clearance, through the suction p

5、ortC. comes from the oil leak in the top clearance of the teeth through the discharge portD. comes from the oil leakage at the end clearance of the gear and passes to the ventAnswer: BThe following seventh questions: on the gear pump bearing statement is not true _.A. oil lubrication by end clearanc

6、eB. uses thrust bearings to bear radial and axial forcesC. grease can be taken back to the suction endD. is not allowed to use plain bearingsAnswer: BEighth title: seal the common gear pump is the most commonly used _.A. soft packing sealB. mechanical sealC. lip sealD.O shape sealing ringAnswer: CNi

7、nth questions: (seal lip seal) and the inner diameter of the shaft diameter should be compared to _.A. is slightly olderB.C. equalityD. is OKAnswer: BTenth questions: (on the oil seal lip seal) is not the correct term is _.The inner side of the A. can be fitted with spring to compensate for lip wear

8、B. seal the lips by hydraulic pressureC. does not allow the inside oil pressure to be too highWhen installing the D., contact the shaft with grease or greaseAnswer: BThe eleventh problem: internal gear pump gear and ring gear tooth number _.A. equalityB. the former is muchC. the latter is muchD.A, B

9、, and C are both possibleAnswer: CThe twelfth problem: internal gear pump and driven components to _.A. sameB. contraryBoth C.A and B haveD. turn clockwise and turn counter clockwiseAnswer: AThe thirteenth problem: _ speed gear and the ring gear of internal gear pump.A. the former is bigB. the latte

10、r is largeC. sameD.A or BAnswer: AThe fourteenth problem: with a crescent shaped separator can reverse gear pump reversal by _ baffle turned 180 degrees, the suction and discharge direction.A. friction forceB. fluid pressureC. meshing forceD. manual adjustmentAnswer: CThe fifteenth problem: with a c

11、rescent shaped separator can reverse gear pump reversal _.A. suction and discharge direction change, but bulkhead position is not movingB. suction and discharge direction unchanged, diaphragm position is not movingThe C. bulkhead turns 180 degrees and changes direction of suction and dischargeThe D.

12、 bulkhead turns 180 degrees and the suction and discharge direction remains unchangedAnswer: CSixteenth question: compared with crescent shaped baffle internal gear pump and gear pump, _ is wrong.A. flow pulsation is smallB. volume efficiency is highC. inhalation performance is goodD. oil trapping p

13、henomenon is lightAnswer: BSeventeenth question: compared with crescent shaped baffle internal gear pump and gear pump, _.A. traffic pulsation is bigB. easily eliminates trapped oilC. volume efficiency is highD. oil absorption zone is smallAnswer: BThe eighteenth problem: paper pad external gear pum

14、p side cover is the role of _.A.Prevention of suction and platoon communicationB. sealC. adjust clearanceD.A and BAnswer: DThe nineteenth problem: bearing gear pump by _ lubrication.A. splashB. oil sumpC. greaseD. end leakage oilAnswer: DTwentieth questions: (on the oil seal lip seal) of the followi

15、ng statements is not true _.A. standard pressure less than 0.5 MPaThe lip is inward when the B. is installedC. relies on the interference of the inner lip to hold the shaftD. stops leakage of more than 1 drops of /hAnswer: DThe following twenty-first questions: the pump will sometimes make _ a rever

16、sal of the suction and discharge direction of the same oil pump.A. external gear pumpB. rotor pumpInternal gear pump C. with crescent shaped baffleD. vane pumpAnswer: C22 question: turn the answer: DThe twenty-third problem: the rotor pump is usually _.A. radial suction and radial dischargeB. side s

17、uction, lateral dischargeC. radial suction and side dischargeD. side suction, radial dischargeAnswer: BThe twenty-fourth problem: the number of teeth _ rotor pump inner and outer rotor.A. equalityB. the former one moreC., the latter oneD.A, B, C are wrongAnswer: COne of the twenty-fifth questions: c

18、ompared with the external gear pump has the advantages of rotor pump is _.A. manufacturing process is relatively simpleThe volume efficiency of B. is higherC. suction performance is good, suitable for high speedD. suitable for high working pressureAnswer: CTwenty-sixth questions: one of the disadvan

19、tages of the rotor pump is _.A. poor inhalation performanceB. does not apply to high RPMThe volume efficiency of C. is lowD. has a short service lifeAnswer: CThe twenty-seventh problem: gear pump has a pair of grooves in the fixed surface jointed with the gear on, its role is _.A. oil storage dry gr

20、indingB. balance axial hydraulic pressureC. prevent cavitationD. prevents trapped oilAnswer: DThe twenty-eighth problem: a gear pump unloading groove, if the leakage is not obvious effect, the pump flow should be _.A. has increased slightlyB. has slightly decreasedC. remain the sameIncreased D. puls

21、ationsAnswer: AThe twenty-ninth problem: the most commonly used method to solve the oil trapped phenomenon of gear pump is _.A. reduce the oil pressure portB. increase the suction portC. opening and unloading grooveThe D. uses a floating end capAnswer: CThe thirtieth problem: asymmetric gear pump un

22、loading groove is _.A. only has grooves at the discharge endB. only has slots at the suction endC. a couple of slots are offset to the suction endD.A or CAnswer: DThirty-first questions: the following statement on a gear pump unloading groove of the error is _.A. the unloading slot is on the side of

23、 the suction inletB. does not allow reverse usageC. reduces hydraulic impact and noiseD. will not reduce volumetric efficiencyAnswer: AThe thirty-second problem: gear pump trapped oil phenomenon does not lead to _.A. bearing load increasedB. work noise increasesC. volumetric efficiency decreasedD. d

24、ischarge pressure increasesAnswer: DQuestion thirty-third: can not eliminate the phenomenon of trapped oil pump gear measure is _.A. reduces the speed of the pumpB. lower the oil temperatureC. opening and unloading grooveD.A and BAnswer: DThe thirty-fourth problem: gear pump will cause the phenomeno

25、n of trapped oil is _.A. vent is too smallB. higher speedImproper adjustment of C. gear end clearanceD. part time, two pairs of adjacent teeth at the same timeAnswer: DThirty-fifth questions: the following statements about the gear pump with non symmetrical unloading groove in the _ is not correct.A

26、. can make noise lowerB. does not allow inversionC. can only be located on the suction sideD. unloading slot is offset to suction sideAnswer: CThe thirty-sixth problem: asymmetric gear pump unloading groove _.A. shall be offset to the discharge sideB. may be located only at the suction endC. has lit

27、tle effect on volumetric efficiencyD. does not affect reverse usageAnswer: C37 question: must set the unloading groove to solve the phenomenon of trapped oil is _ gear pump.A. positiveB. obliqueC. herringboneD. allAnswer: AThirty-eighth questions: the following statements about the gear pump in _ is

28、 not correct.A. can suck itselfB. rated discharge is independent of sizeThe C. can be connected directly with the motor without slowing downD. flow is continuous and uniform without pulsationAnswer: DThirty-ninth questions: the following statements about the gear pump is in the correct _.A. has no s

29、elf-priming capabilityB. is superior to reciprocating pump because of its high rotating speedC. because of poor seal, self-priming capacity better than reciprocating pumpD. are volumetric pumps, self-priming capacity and reciprocating pump almostAnswer: C40 question: _ not following the gear pump fl

30、ow increase.A. increase tooth widthB. increase the pitch diameterC. reduces the number of teethD. increases the number of teethAnswer: DThe forty-first problem: _ does not make the gear pump volumetric efficiency decreases.A. low oil temperatureB. speed is too lowC. suction vacuum is lowD. rpm is to

31、o highAnswer: CThe forty-second problem: gear pump such as gear diameter, width, number of teeth is less _.The smaller the A. flow rate isThe uneven degree of B. flow increasesC. has nothing to do with trafficThe lower the discharge pressure of D.Answer: BThe 43 problem: unbalanced radial force of g

32、ear pump drive gear and the driven gear of the _.A. are equal in size and opposite in directionB. ranging in size and in the same directionC. are equal in size and the same in directionD. vary in size and directionAnswer: DThe forty-fourth problem: the radial force and the size of _ independent gear

33、 pump work.A. tooth widthB. addendum diameterC. suction and discharge pressure differenceD. speedAnswer: DThe forty-fifth problem: reduce the common method of gear pump radial unbalanced force is _.A. narrow the outletB. corrected profileC. open drain tankD. shrink suction portAnswer: AThe forty-six

34、th problem: gear pump when the driving gear and the driven gear _.A. is free of radial forceB. is subjected to equal radial forceC. the radial force of the former is largerD. is contrary to CAnswer: DThe forty-seventh problem: high-pressure gear pump adopts the automatic gap compensation structure f

35、or _.A. eliminates trapped oilB. reduces internal leakageC. reduces wearD. reduces noise and vibrationAnswer: BThe forty-eighth question: the main reason of restricting the gear pump speed is improved _.The speed of A. prime mover is difficult to improveThe B. will cause excessive load on the bearin

36、gsC. will increase inhalation difficultiesD. will exacerbate oil trappingAnswer: CThe forty-ninth problem: gear pump discharge pressure exceeds the rated value will not lead to _.A. bearing load increasedB. wear intensifiesC. motor overloadD. traffic decreases dramaticallyAnswer: D50 Title: electric

37、 gear pump rated discharge pressure and allowed _ independent.A. sealing performanceB. bearing capacityC. motor powerD. geometry sizeAnswer: DThe fifty-first problem: gear pump rated discharge pressure and allow the relevant _.A. speedB. geometry sizeC. teeth numberD. sealing performance and bearing

38、 capacityAnswer: DThe fifty-second problem: gear pump in the boat not generally used for _.A. barge pumpB. auxiliary lubricating oil pumpC. cargo pumpD. hydraulic auxiliary pumpAnswer: CThe fifty-third problem: gear pump and screw pump has the advantages of _ compared.A. higher speedB. uniform flowC

39、. efficiency is higherD. is cheapAnswer: DThe fifty-fourth problem: Theory of flow and discharge pressure in the pump is independent of the _.A. jet pumpB. centrifugal pumpC. gear pumpD. vortex pumpAnswer: CThe 55 problem: safety valve must be set in the pump is _.A. vortex pumpB. gear pumpC. centri

40、fugal pumpD. water ring pumpAnswer: BThe following fifty-sixth questions: the pump can be used to discharge oil pump is _.A. jet pumpB. water ring pumpC. vortex pumpD. rotor pumpAnswer: DThe 57 problem: unloading groove symmetrical gear pump limit reverse use may be due to _.The commutation of A. mo

41、tor is difficultB. bearings, such as oil drain direction has been fixedC. oil accumulation aggravatedD. hydraulic radial force unbalanceAnswer: B58 question: why not limit _ gear pump using inversion.The A. features an asymmetric unloading slotB. suction and discharge ports may vary in diameterC. bu

42、ilt in safety valves are one-way workD. hydraulic radial force unbalanceAnswer: DThe fifty-ninth problem: new gear pump repair or demolition should be to gear pouring oil benefits can be _.A. reduces startup powerB. reduces gear wearC. improves self-priming capacityD.B and CAnswer: DSixtieth Title:

43、electric gear pump discharge pressure is too high the harm does not include _.A. bearing radial force is too largeB. wear and leakage increasedC. oil accumulation aggravatedD. motor overloadAnswer: CThe sixty-first problem: tooth roller pump suction pressure is too low when the noise increase is mai

44、nly due to _.A. oil vaporizationB. gas dissolved in oilC. leakage increasedD. oil accumulation aggravatedAnswer: BThe sixty-second problem: in the dismantling and assembly of gear pump should pay attention to the major _ clearance check.A. addendum and pump housingB. gear end faceC. gear engagementD

45、. the pump shaft extends out of the pump housingAnswer: BThe sixty-third problem: gear end clearance _ common gear pump test.A. feelerB. dialC. vernier caliperD. lead wireAnswer: DThe sixty-fourth problem: the gear end clearance of gear pump increases will not make _.A. flow reductionB. self-priming

46、 capacity decreasedC. pressure reductionD. power increaseAnswer: DThe sixty-fifth problem: gear pump should not be used in low speed is mainly _.A. wear badlyB. too much noiseCavitation happens in C."D. volumetric efficiency is too lowAnswer: DSixty-sixth questions: the following statements abo

47、ut the gear pump is in the correct _.A. discharge increased, the actual flow unchangedWhen the viscosity of B. is increased, the leakage is less and the volumetric efficiency is increasedThe C. oil temperature is too high or the viscosity is too low, so that the volumetric efficiency is reducedD. th

48、e oil seal of the shaft should have a small amount of oil to ensure lubricationAnswer: CSixty-seventh Title: commonly used machine comes oil pump is _.A. external gear pumpInternal gear pump B. with crescent shaped baffleC. rotor pumpD.A or B or CAnswer: DThe sixty-eighth problem: the gear pump suct

49、ion vacuum suction is larger and the difficulty is not the reason _.A. pump clearance is too largeB. filter cloggingC. suction too highD. suction valve is insufficientAnswer: AThe sixty-ninth problem: the gear pump suction vacuum suction difficult and insufficient reason does not include _.A. gland

50、leakageB. pump clearance is too largeC. after repair and repair, the pump is not filled with oilD. oil temperature is too lowAnswer: DThe seventieth problem: gear pump suction pressure is too low when skating "cavitation" is usually due to _.A. oil vaporizationVaporization of water in B. o

51、ilC. dissolved in oil and air escapesD.A or B or CAnswer: CThe 71 problem: _ will cause the gear pump suction pressure is low enough to form.A. suction line blockedB. suction line leaksThe viscosity of C. oil is too largeD. drain line leaksAnswer: BThe seventy-second problem: a common cause of excessive noise of gear pump in the work may be _.