The tenth set of questions

First, judge the question (put the judgment result in brackets after the question, and mark "√" correctly and "×" wrongly. 1 for each question, out of 30 points. )

1. Assembly drawing is an important tool to express design intent and technical exchange. ( )

2. Feed is the process of cutting the tool on the machining surface for many times. ( )

3. Casting is a metal cutting method for manufacturing machine parts. ( )

4. Turning can turn the excircle, end face, slotting and cutting, but not the thread and disc spring. ( )

5. Reasonable selection of marking benchmark is the key to improve marking quality and efficiency. ( )

6. The quick change drill chuck can change the drill bit without stopping the machine, which greatly improves the productivity. ( )

7. The accuracy requirements of scraping surface generally include shape and position accuracy, size accuracy, contact accuracy and surface roughness. ( )

8. After scraping, the surface structure of the workpiece is looser than before, and the hardness is reduced. ( )

9. The dimensional accuracy after grinding can reach 0.01~ 0.05mm. ()

10. Low carbon steel has good plasticity and is not easy to break. It is often used to make small grinding tools. ( )

1 1. Correcting the plate is not to expand the area of the plate, but to stretch or compress the plate by using the principle of stretching or compressing. ( )

12. After the workpiece is bent and unloaded, the bending angle and radius will change and rebound. ( )

13. The riveting of the low-pressure vessel device should adopt strong riveting. ( )

14. Organic binder is characterized by high temperature resistance, but its strength is low. ( )

15. When assembling the stud, its center line must be perpendicular to the surface of the machine body. ( )

16. Loose key connection can ensure high coaxiality between the shaft and the parts on the shaft. ( )

17. When the wedge key is connected, both sides of the key are working faces, and there is a certain gap between the key and the keyway. ( )

18. When the belt is driven, the wrap angle of the belt on the pulley should not be less than 120. ( )

19. The meshing backlash between two gears has nothing to do with the center distance deviation. ( )

20. The advantage of worm drive is high transmission efficiency, but it will generate a lot of heat when working, so it must have good lubrication.

( )

2 1. The main technical requirement of coupling assembly is to ensure the coaxiality of two shafts. ( )

22. The quality of assembly work may have a certain impact on product quality. ( )

23. The vice is a general fixture used to clamp the workpiece. ( )

24. The distance between the grinder bracket and the grinding wheel should be kept within 0.3mm. ()

25. When selecting the gauge block group, the minimum number of blocks should be adopted as far as possible. The more blocks, the greater the error. ( )

26. The feeler gauge is made of thin steel plate, so it can measure the workpiece with higher temperature. ( )

27. Felt ring and rubber oil seal device are simple in structure, but have large friction force, which is suitable for low movement speed. ( )

28. The phenomenon that mechanical parts or tools and molds lose their original functions for some reason is called fatigue failure. ( )

29. The methods to test the backlash of gear teeth are lead pressing method and dial indicator method. ( )

30. Before starting the machine, the feeding mechanism should always be in the "stop" position, and carefully check the safety protection device to ensure its reliability.

Second, multiple-choice questions (choose the correct answer and fill in the corresponding letters in brackets in the question. 1 for each question, out of 40 points. )

1. When writing the limit deviation in the part drawing, the decimal points of the upper and lower deviations are aligned, the decimal places are the same, and the deviation is zero ().

A. It must be marked B, but it is not necessary to mark C. It is explained by the word D and represented by symbols.

2. The machining size determined by marking can be guaranteed by () in the machining process.

A. measurement B. alignment C. borrowing D. adjustment

3. General marking accuracy can reach ().

A.0.025 ~ 0.05mm b.o. 25 ~ 0.5 mm.

C. About 0.25mm, with a diameter of 0.5mm.

4. When the precision of the hole is high and the surface roughness value is low, the cutting fluid which mainly plays the role of () should be selected in machining.

A. Lubrication B. Cooling C. Cooling and lubrication

5. The scraping allowance left after processing should not be too large, generally () mm. ..

A.0.05~0.4 B.0.04~0.05 C.0.4~0.5

6. During fine scraping, some shiny research points appear after pushing research, which should be ().

A. shave gently. B. shave a lot. C. moderate shaving.

7. The abrasive material is better than the ground workpiece ().

A. it's all the same.

8. Mainly used for carbon tool steel, alloy tool steel, high speed steel and cast iron workpiece grinding abrasive is ().

A. carbide abrasive B. oxide abrasive C. diamond abrasive

9. Due to the phenomenon of cold work hardening, cold correction is only applicable to the material of ().

A. good rigidity and serious deformation B. good plasticity and not serious deformation C. good rigidity and not serious deformation.

10. All rivets with a diameter less than 8 mm adopt ().

A. hot riveting B. cold riveting C. mixed riveting

1 1. The surface of the bonded joint should be ().

A. rough B. fine C. uniform thickness

12. The mechanical locking device for bolt connection includes () locking.

A. stop washer B. spring washer C. double nut locking

13. Loose key connection can ensure that the shaft and the parts on the shaft have a higher ().

A. Coaxiality B. Verticality C. Parallelism

14. The specification of taper pin is indicated by () and length.

A. Small head diameter B. Big head diameter C. Intermediate diameter

15. After assembling two sprockets, when the center distance is less than 500mm, the axial offset should be less than () mm. ..

A. 1 B.2 C.3

16. When cylindrical gears are installed, the directions of contact points are different because of two gears ().

A. Axis is skewed B. Axis is not parallel C. Center distance is too large or too small.

17. When the interference between the inner ring of the rolling bearing and the journal is too large, the assembly method can be ().

A. knock-in method B. press-in method C. temperature difference method

18. The assembly accuracy depends entirely on the machining accuracy of parts. The assembly method is ().

A. Complete exchange method B. Proportioning method C. Adjustment method

19. The distance between the grinder bracket and the grinding wheel should be kept within () mm to prevent the workpiece from penetrating.

accident

A.5 B.4 C.3

20. The accuracy of the vernier height gauge is generally () mm. ..

A. Order 65438

The size of 2 1. must conform to the standard ().

A. Enterprise B. State C. Industry D. Issued by the Ministry

22.M 10 means that () is 10 mm thick thread.

A. medium diameter B. small diameter C. large diameter D. medium diameter

23. The scoring direction of the inner micrometer and the scoring direction of the outer micrometer ().

A. same B. opposite C. crossed D. vertical

24. When measuring the workpiece with a dial indicator, the long pointer rotates once and the toothed bar moves () mm. ..

a . 2 b . 1 c . 10d . 0. 1

25. The algebraic difference between the maximum limit size of the hole and the minimum limit size of the shaft is negative, which is called ().

A. Maximum residual B. Maximum clearance C. Minimum interference D. Minimum clearance

26. The standard flat plate is () during inspection, marking and scraping.

A. Basic measuring tools B. General measuring tools C. Basic tools

27. The gear is fixed on the shaft, and () should be adopted when the required fit interference is large.

A. Impact loading B. Press-in C. Hydraulic sleeve assembly D. Stamping assembly

28. When turning, the rotating motion of the workpiece is ().

A. main motion B. feed motion C. auxiliary motion D. cutting motion

29. The higher the strength and hardness of the workpiece material, the greater the cutting force ().

A. smaller B. larger C. generally unchanged D. same size

30. The symbol of Brinell hardness is indicated by ().

A. Commission on Human Rights

3 1. The alloy of copper and tin is called () copper.

A. purple B. pure C. cyan D. yellow

32. safe voltage is lower than () V.

A.220 B.380 C. 12 D.36

33.22 Single-ended wrench 22 refers to ().

A. Bolt diameter B. Bolt length

C. Diameter of external circle of hexagon head of bolt D. Distance between opposite sides of hexagon head of bolt

34. After the material is bent, the layer with the same length is called ().

A. intermediate layer B. neutral layer C. central layer D. inner layer E.

35. The material after cold working and hardening brings difficulties to further correction or other cold working, and () treatment can be carried out when necessary to restore the original mechanical properties of the material.

A. quenching, tempering and annealing

36. The rake angle of ordinary manual tap is generally ().

a . 5 ~ 8 b . 8 ~ 10 c . 10 ~ 12d . 9 ~ 1l

37. The cone angle at both ends of the mold is part ().

A. clamping B. cutting C. guiding D. tail

38. The grinding allowance is generally within () mm. ..

a . 0.5 ~ 1 b . 3 ~ 5 c . 0.005 ~ 0.03d . 0.03 ~ 0.05

39. Assembly is the process of combining several (). Into a machine.

A. Part B. Component C. Assembly D. Parts

40. The drill consists of () and the tail.

A. Working part B. Cutting part C. Guiding part D. Neck

3. Multiple choice questions (There are multiple options for each of the following questions, and at least two of them are correct. Please fill in the code of the correct answer in the blank. Each question 1, ***30).

1. Assembly drawing is an important tool of ().

A. Imitate B. Maintain C. Expression of design intent

D. Guide production E. Conduct technical exchanges

2. The special expression of the assembly drawing is ().

A. Imaginative painting B. Mapping painting C. Simplified painting

D. Disassembly drawing E. Development drawing

3. The production process includes () two parts.

A. Main process B. Auxiliary process C. Inspection process

D. Assembly process E. Transportation process

4. The geometry of the workpiece is composed of ().

A. point B. line C. plane D. body

5. According to the precision requirements of scraping the surface, the scraper can be divided into three types ().

A. plane scraper B. coarse scraper C. arc scraper D. fine scraper E. fine scraper

6. There are two commonly used display agents ().

A. iron oxide B. lead oxide C. red lead powder D. blue powder E. blue oil

7. Gear transmission can be divided into () according to its structural characteristics.

A. parallel shaft drive B. cross shaft drive C. cross shaft drive D. vertical shaft drive

8. The research materials mainly include (), etc.

A. gray cast iron B. nodular cast iron C. carbon steel D. low carbon steel E. copper

9. Carbide abrasives are mainly used for grinding high-hardness workpieces such as ().

A. cemented carbide B. gem C. agate D. ceramic E. hard chromium

10. According to the method of generating corrective force during correction, correction can be divided into () and so on.

A. Manual correction B. Pressure correction C. Flame correction

D. Mechanical correction E. High frequency hot spot correction

1 1. Riveting forms can be divided into ().

A. Single cover plate connection B. Double cover plate connection C. Lapping D. Butting E. Corner joint

12. Welding is divided into three categories ().

A. Manual arc welding B. Brazing C. Fusion welding D. Pressure welding E. Brazing

13. The locking devices commonly used for threaded connection are ().

A. spring washer locking B. friction locking C. mechanical locking

D. Impact locking E. Adhesive locking

14. There are three kinds of loose binding connections ().

A. ordinary Ping Jian connection B. spline connection C. wedge key connection

D. Semi-circular key connection E. Guiding Ping Jian connection

15. Pin is divided into () according to its structural form.

A. cylindrical pin B. locating pin C. conical pin D. cotter pin E. safety pin

16. Before the gear shaft assembly is put into the box, it should be inspected from three aspects, including ().

A. dimensional accuracy and shape accuracy of holes and planes

B. Verticality between hole and plane

C. Mutual parallelism between hole and plane

D. mutual position between hole and plane

E. Surface roughness and appearance quality of holes and planes

17. The assembly process includes work such as (), and its workload accounts for a large proportion of the total workload of mechanical manufacturing.

A. Assembly B. Machining C. Adjustment D. Detection E. Test

18. The assembly method commonly used in mechanical manufacturing is ().

A. Complete machine assembly method B. Interchange assembly method C. Group assembly method

D. Adjustment and assembly methods E. Repair and assembly methods

19. There are many kinds of measuring tools, which can be divided into three types according to their uses and characteristics.

A. Precision measuring tools B. General measuring tools C. Special measuring tools

D. Standard measuring tools E. Inspection measuring tools

20. The common forms of surface failure are ().

A. Friction failure B. Wear failure C. Damage failure

D. Fatigue failure E. Corrosion failure

2 1. Commonly used in belt drive are ().

A.v belt B. V belt C. trapezoidal belt D. flat belt

22. Steel can be divided into () according to the purpose.

A. high-speed steel B. structural steel C. tool steel D. special steel

23. When proofing and punching holes on the drawn lines, the position of () of the lines must be made.

A. Arc B. Intersection C. Turn D. End point

24. The chisel can be divided into ().

A. flat chisel B. wide chisel C. narrow chisel D. oil groove chisel

25. The basic filing methods are ().

A. Forward archiving B. Cross archiving C. Push archiving D. Reverse archiving

26. Riveting can be divided into () according to the use requirements.

A. movable riveting B. fixed riveting C. cold riveting D. hot riveting

27. Belong to the fitter commonly used equipment ().

A. table drilling machine B. vertical drilling machine C. vise D. grinder E. lathe

28. The tolerance zone of holes and shafts is determined by ().

A. basic deviation B. dimensional tolerance C. dimensional size D. accuracy

29. The cutting amount refers to the floorboard of the ().

A. cutting depth B. cutting speed C. feed D. cutting width

30. The reamer is divided into () according to the reaming shape.

A. Tapered reamer B. Cylindrical reamer C. Plane reamer D. Curved reamer