First, multiple-choice questions:
1, China's wireless communication network has to pay huge fees every year because it uses foreign technology. At present, the newly-built 3G wireless communication network adopts TD-SCDMA technology with independent intellectual property rights in China, which can save a lot of foreign exchange. This case shows that technology has
A, integrity b, relevance c, duality d, patentability
2. When designing tables and chairs as shown in the figure, from the point of view of man-machine relationship, the following points do not need to be considered.
1. Height difference between table and chair
B, table and chair processing time limit for a project
C. Angular shapes of tables and chairs
D, the height of the desk and chair
3. In modern mechanical design, computer technology is generally used to simulate the mechanical properties of products. This technical test method belongs to
A, physical test method B, intensive test method C, virtual test method D, transplant test method
Xiao Gang made a home dimming floor lamp as shown in the figure. In the design process, the factors that need to be considered in the design of dimming floor lamp are analyzed. What is unreasonable in the following design analysis is that
A, lampshade should give attention to both beauty and safety.
B, from the point of view of saving electricity, you can use a bulb with a rated voltage of 36V.
C, dimming circuit to avoid flashing lights.
D, consider the size and quality of the base.
5. As shown in the figure, it is a welding robot on the production line. The following statement about the use of robots is not appropriate.
First, the production cost is increased
B, the production efficiency is improved.
C, improve the stability of product quality.
Reduce the labor intensity of workers.
6. Some packaging bags have notches on the side that are easy to tear. This design embodies the design.
A, practical principle b, aesthetic principle c, sustainable development principle d, economic principle
7. In the process of mobile phone development, some parts need to be tested. The following test items for mobile phone buttons are unnecessary.
A, the key surface damage test B, the number of clicks that the key can love.
C, ultra-high temperature resistance test of key materials D, touch test of key surfaces
8. The size requirements of technical drawings are correct, complete, clear and reasonable. In the following dimensioning examples, the dimensioning examples that meet the requirements of national standards are as follows.
9. As shown in the figure, it is a coordinate diagram for evaluating a product. The following errors in coordinate diagram analysis are
First, this product is a creative product.
This product is both practical and beautiful.
C. the moral problems of this product are caused by the lack of standard technology.
D, this product is cost-effective.
10, bicycles use many standard parts such as bolts and nuts. When manufacturers design such products, the purpose of using standard parts is to
A, improve the aesthetics of products; b, realize universal interchange and reduce production costs.
C, environmental protection and sustainable development d, reduce the number of parts.
1 1. Among the following operating requirements for drilling holes in metal materials, the statement is incorrect.
A. Pay attention to operation and wear protective gloves. B. Wear protective glasses when operating.
C, clamp the workpiece d with a vice or pliers, and directly support the small and thin workpiece without hands.
12. When Xiaojun plays badminton, the force on the metal pole is mainly
A, bending force (bending moment) b, pressure c, tension d, torsion (torque)
13. As shown in the figure, six nuts and screws are used to connect two parts. The correct procedure for tightening this set of nuts (nut numbers are A, B, C, D, E and F respectively) is as follows.
14, the following four parts of the bicycle are hinged.
15. In the control system of voice-activated light, the sensor receives the sound signal, and after being processed by the control circuit, it drives the switch to turn on or off the light bulb. The control object of the system is the light bulb, and the control quantity is
A, the light of the bulb b, the size of the sound c, the level of the power supply voltage d, switch on and off.
16, from the basic characteristics of the system, the main signs that distinguish watches from mobile phones are as follows
A, the integrity of the system b, the purpose of the system c, the relevance of the system d, the environmental adaptability of the system.
Wang Linjia bought a new car. In order to save fuel, the following incorrect system optimization measures were taken.
A, rational use of automobile air conditioning b, keep the steam pressure appropriate.
C. Fill the fuel tank with D every time you refuel, so as to reduce unnecessary load.
18. Machining a part as shown in the figure (two holes are threaded holes) is made of steel, and the surface requires rust prevention. The processing process needs the following four links: ① blanking and marking; (2) saw file; ③ Drilling and tapping; ④ Quenching and electroplating. The correct processing flow is
a、① ② ③ ④ B、② ① ③ ④ C、② ④ ① ③ D、① ② ④ ③
19, the following is true about the interference factors on the control system.
A, interference factors only act on the controlled quantity.
B, interference factors will not act on the open-loop control system.
C, the role of interference factors in the closed-loop control system will be reflected in the change of output.
D, interference factors can be used.
20. Xiaoming found that school street lamps sometimes waste electricity because they are not turned off in time, so he designed a control scheme, which can be turned off at dawn and turned on after dark. The control system shall belong to
A, automatic closed-loop control system B, automatic open-loop control system
C, manual closed-loop control system D, manual open-loop control system
Second, non-multiple choice questions
2 1. Fill in the missing lines in the three views according to the stereogram.
22. Ordinary folding bicycles usually adopt the way of folding the frame in the middle. As shown in the figure, the folding electric bicycle is changed to reverse folding of the rear wheel and seat at the same time, and the volume is smaller after folding. The subminiature wheel motor with domestic invention patent has reduced the volume and mass of the car. The car has two driving modes, electric and manual, which can prolong the service life of batteries and reduce the pollution of waste batteries to the environment. The frame is made of recyclable aluminum alloy, and cushions, wheels and pedals are common parts. The speed limit function of automobile meets the industry standard. Please evaluate from the perspective of design principles:
(1) In what ways does this product embody the innovative principle of design?
(2) In what ways does this product embody the technical specification principles of design?
(3) In what ways does this product embody the design principle of sustainable development?
23. Figures (a) to (e) show the parts that need to be assembled for a common desk fan, and Figures (f) to (h) a) to (e) are partial schematic diagrams of the assembly process.
(1) Please draw the flow chart of assembling the parts shown in (a) to (e) according to the schematic diagram.
(2) The time sequence between the steps in the assembly process is characterized by inversion (fill in "may" or "may not").
24. Excavators as shown in the figure are commonly used mechanical equipment in construction, mining and other industries. In order to improve the product competitiveness, an excavator manufacturer comprehensively analyzed the power system, walking system, excavation system and control system of the excavator, and analyzed and optimized the key parts by using computer technology. The following improvement measures were put forward from the aspects of product design, processing technology and production management.
Optimize the processing technology of parts and components to improve production efficiency;
Improve the walking system to adapt to different working environments;
Add hammer, grab and other accessories to expand the use function;
Strengthen production management, improve parts structure, save materials and reduce weight;
Air conditioning is installed in the cab to improve the working environment of the operator.
Please analyze the system analysis of excavators related to manufacturers and put forward improvement measures, and answer the following questions:
(1) The manufacturer's analysis of excavator products embodies the principle, principle and principle of system analysis;
(2) The improvement measures aimed at reducing the production cost include (fill in the number of appropriate measures at "").
25. The power devices of traditional trains are all installed on locomotives, and many passenger cars without power devices are hung behind locomotives. The newly developed EMU in China disperses the power devices on the passenger cars, so that it can not only have traction power, but also carry passengers, which improves the running speed of the trains. As shown in the figure, it is a simplified schematic diagram of the traction drive control system of the motor car. The driver sends a driving instruction (set speed) to the automatic driving device, and the automatic driving device sends a signal to control the traction transmission device to operate, and the traction transmission device drives the wheels to rotate, so that the motor car runs. The speed sensor detects the actual running speed of the motor train, and sends the measured speed signal to the automatic driving device to compare with the set speed, and adjusts the running speed of the motor train according to the comparison deviation value.
(1) According to the above schematic diagram and its description, fill in "▲" in the control system block diagram corresponding to the traction drive control system of the motor car.
(2) The process that the speed sensor transmits the detected speed signal of the motor train to the automatic driving device to compare with the driving instruction is called ⑤▲.
Fig. 26 shows the schematic design of the disabled toilet.
Please analyze the design drawing and answer the following questions:
(1) Refer to the answer example and fill in the main design contents of Figures (a) and (c) at "▲";
Example: The main design content of Figure (b) is the installation height of safety facilities (handles, handrails).
① The main design content of Figure (a) is ▲; ② The main design content of Figure (c) is ▲.
(2) The handle shown in Figure (b) is fixed on the wall with four expansion screws. If the handle is required to be under the horizontal tension of 980N (perpendicular to the wall), the connection between the handle and the wall will not be loose. Please design a simple test plan, and use a weight with the mass of 100Kg (other auxiliary materials are customized) to check whether the handle is qualified. Just use a schematic diagram to explain the test method, and if necessary, make a brief description in words.
(3) If the connection between the handle and the wall is found to be loose after the test, please choose the measures that can enhance the connection strength from the following options, and fill in the serial number of the option at "".
① Increase the thickness of the handle mounting plate; ② Increase the area of the handle mounting plate;
③ Select a longer expansion screw; ④ Use expansion screws with larger diameter.
Measures to strengthen the connection strength are ▲, ▲.
Students in a middle school science and technology innovation interest group found that the garbage in the dustpan was easily blown out by the wind. In order to solve this problem, two pictures of products for reference were collected from the Internet (as shown in the figure).
(1) Please point out how these two products realize the windproof function respectively.
(2) Please redesign a dustpan with windproof function for the school. The design requirements are as follows:
A. the size is suitable for middle school students;
B. the windproof device is innovative;
C, reasonable structure and convenient use and manufacture;
(1) Draw a sketch of your design and explain it in words if necessary;
(2) The length, width and height dimensions of dustpan on the sketch, indicating the materials used in each part;
(3) explain how your design scheme can achieve windproof function;
(4) Explain two features of your design besides the windproof function.