Annotation item
1. Examination time: 120 minutes.
2. Please fill in your name, admission ticket number and unit name at the label of the test paper as required.
Please read the answer requirements of all kinds of questions carefully, and fill in your own answers in the designated places.
4. Don't scribble on the test paper, and don't fill in irrelevant contents in the sealed area.
One, two, three, four, five points, unified scoring.
Scoring scorer
Fill in the blanks (question 1 ~ 20. Please fill in the blanks with the correct answers. 65438+ 0 points for each question, ***20 points. )
1. Computerized numerical control is a system called CNC for short.
2.SINUMERIK 820s system is a different control system, which is specially designed for economical data machine tools.
3. The unbalanced three-phase voltage in the distribution network will cause the input voltage and current waveform of the inverter to change.
4. In order to improve the anti-interference ability, AC power ground wire and ground wire cannot be used.
5. Electric field shielding solves the problem of distributed capacitance, and the ground wire is grounded.
6. The electrostatic shielding of the electronic measuring device must be connected with the zero signal of the shielding circuit.
7. Most control systems have the functions of automatic control, automatic information processing, automatic correction and automatic detection.
And other functions.
8. The capacitance of the main circuit of the frequency converter is mainly determined according to the decline rate of the capacitance, and it is needed if it is less than the initial value.
Replace.
9. Mechatronics includes mechanical technology, computer and information processing technology, system technology, technology and communication.
Sensing detection technology, servo transmission technology.
10. The electrical control schematic diagram is designed in the order of main circuit-control circuit-overall inspection. 1 1. The transformation of economical CNC machine tools is mainly used for the numerical control transformation of medium, small and milling machines.
12.SIN840C can realize interpolation.
13.CSB is the abbreviation of Central Service Bureau.
14.SIN 840c control system consists of main body of numerical control unit, spindle and spindle.
15. There are mainly four processing operation modes on the machine tool operation panel, namely JOG manual, TEACHIN teaching, MDA and.
Automatic, automatic.
16. In an automatic control system, a system that can track input changes with a certain accuracy is called
Servo system.
17. The inverse proportional amplifier has two input terminals, one is the terminal, which means that the input and output are in phase opposition, and the other is.
One is the noninverting terminal, which means that the input signal and the output signal are in phase.
18. lean production changes the production mode of the previous project to the next project in the production process.
Features.
19 is an extremely important way and means to cultivate and improve students' independent operation skills.
20. In order to improve the reliability of electrical equipment operation, it is called working grounding which is closely connected with the grounding electrode. Scoring scorer
Second, multiple-choice questions (question 2 1 ~ 30. Please choose a correct answer and put the corresponding letters in brackets. 2 points for each question
Points, ***20 points)
2 1. When replacing the capacitor, the () of the capacitor must meet the requirements first.
A, capacitor b, withstand voltage c, current d, power
22. The tester can provide three output formats: PROTEL file format, () and index table format, which can be used as required.
Need to make a choice.
A, BMP format b, text format c, connection table format d and JGP format.
23. Commonly used industrial control systems are usually divided into distributed control systems, programmable controllers and STD bus industrial control.
Machine, (), modular control system, intelligent adjustment control instrument, etc.
A, 16-bit single board computer b, industrial computer c, main CPU D and 32-bit single chip microcomputer.
24. Distribution transformer three-phase output voltage imbalance rate is greater than (), will have a bad influence on the system.
a、5% B、3% C、5% D、3%
25. Frequency conversion equipment speed control system improves the performance of () and reduces power consumption.
A, speed regulation b, accuracy c, anti-interference d, stability
26.PLC transformation equipment control refers to replacing the huge and complicated original equipment control with PLC programmable controller.
() control equipment.
A, analog B, relay C, real-time D, sequential logic circuit
27. Inverter transformation equipment speed regulation system adopts AC inverter speed regulation instead of the original equipment () or other motor regulation.
Three-speed scheme
A, pole-changing speed regulation b, variable voltage speed regulation c, DC speed regulation d, closed-loop negative feedback 28. When transistor plotter measures triode, () can change the spacing between characteristic curve families.
A, step size selection B, power consumption resistance C, collector-base current/potential D, and peak range
29. The role of repeated grounding is to reduce the grounding voltage of the leakage equipment shell and reduce the danger of disconnection.
A, zero line b, protective grounding line c, phase line d, phase line and zero line 30. When the human body touches the charged body, the leakage protection device can cut off the power supply in ().
A. 10s B, 5s C, 1s D and 0. 1s scorekeeper.
Third, true or false (question 3 1 ~ 40. Please put the judgment result in brackets, tick "√" correctly and "×" wrongly.
Each question 1, *** 10. )
() Programming in the main menu of 3 1 SIN840C is edited on the hard disk of MMC. Edit according to ASC code. () 32.32. The diagnosis area is mainly used for the adjustment and maintenance of machine tools.
() 33. The analog-to-digital converter is an AC-DC converter.
() 34. There are Master Production Plan (MP3), Material Requirement Plan (MRP), Production Schedule Plan (DS) and Capacity Requirement Plan (CRP).
It constitutes the manufacturing resource plan MRP Ⅱ Ⅱ.
() 35. Group O9000-4 is the guiding standard in the ISO9000 family standard.
() 36. The maintenance electrician team mainly serves production.
() 37. The general method of theoretical training is classroom teaching.
() 38. Guiding operation is an extremely important method and means to cultivate and improve students' independent skills.
Practice has proved that low-frequency current is less harmful to human body than high-frequency current.
() 40. When the person who gets an electric shock has a heartbeat and is not breathing, artificial respiration should be performed. Scoring scorer
Fourth, short answer questions (question 4 1 ~ 44. 5 points for each question, ***20 points. ) 4 1. What steps does surveying and mapping generally include?