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1、轮机工程面试常见问答（Questions and answers on Marine engineering interviews）Refer to the interviewWhy enter oneself for a master of professional type.There are different types of full-time professional degree master and academic graduate students.The aim is to cultivate the high-level specialized talents who
2、have a solid theoretical foundation and adapt to the actual work of the industry.Professional degree in professional practice as the guidance, attaches great importance to the practice and application, outstanding characteristic is combined closely with the academic and professional, not primarily e
3、ngaged in academic research, but the working career in has obvious background.L briefly describes the composition and working mechanism of the control system.Controller, actuator, controlled object, feedback link2. Test the type and application prospect of computer.Scale, large, medium, small, micro
4、.By use, generic, dedicated.According to historical development, electronic tube, transistor, integrated circuitThe outlook is optimistic. The computer impressed me that its development seemed truly endless. I dont think there is any limit to the information processing technology. In some ways, info
5、rmation can be nourished by itself. The more you have, the more you can get. The faster you process information, the more things you can do.3. The influence of three commonly used control rules and control parameters on regulating function of the regulator.Bit adjustment: the upper limit and lower l
6、imit of the controlled amount are corresponding, and the regulator has only two output states.Ratio: the output of the regulator is proportional to the change in the input quantity: the quick fault of the reaction: there is static deviationPI ratio integral: the change in the ratio of the output of
7、the regulator to the input quantity is the advantage of the variation of the proportional integral: the elimination of the static deviation defect: the reaction is slowPD proportional differential: the output of the regulator is proportional to the change of the input quantity into a proportional di
8、fferential4. The impact of automation and network technology on industry.Industrial automation is a general term for the measurement and manipulation of information processing and process control, such as measurement and manipulation, in the case of machine equipment or production process without hu
9、man direct intervention. The industrial revolution was the midwife of automation. It was because of the need of the industrial revolution that automation broke through the shell and flourished. Automation technology at the same time also promote the progress of the industry, now the automation techn
10、ology has been widely used in machinery manufacturing, electric power, construction, transportation, information technology, become the main means of improving labor productivity.Briefly describe the topic selection and the main work and performance of the undergraduate thesis.6. Test the compositio
11、n of computer hardware and its functions.Graphics card, power supply, optical driveCPU: operationMemory: poor speed of CPU and hard disk. Slot connection.Hard disk: store data.Motherboard: connecting the above.Monitor: displays the results of the computer.Keyboard: enter basic data.Mouse: input and
12、extend data.7. The present situation and development trend of computer software technology development.With the arrival of the 21st century, the information age has come to us. The most important symbol of this era is the wide application of computers. Computer applications have reached a very popul
13、ar level nowadays, and computers can be seen everywhere. We are also familiar with the environment, the home entertainment, the schools computer room, the financial place, and the ubiquitous Internet cafes everywhere. The computer is everywhere. We may even wonder where the computers will go and whe
14、re they will be controlled.The outlook remains optimistic, of course. The computer impressed me that its development seemed truly endless. I dont think there is any limit to the information processing technology. In some ways, information can be nourished by itself. The more you have, the more you c
15、an get. The faster you process information, the more things you can do.8. Discuss the individuals understanding of the direction of turbine automation and intelligence, and discuss the key technologies in this directionWhat are the theories?9.The composition and main measures of the power station sy
16、stem are discussed.Power distribution device power network loadBasic parameters: current type (electrical system), rated voltage rating, rated frequencyWhat is the best course in college? What is the best way to learnThe content of the.Which one was the most difficult to learn in the courses you stu
17、died? What method did you use to learn it well?Higher mathematicsThis is the learning method Ive been using since I went to schoolAt the university stage, I finally understood that after so many years of learning, why always take the exam.The development of our partys history, the best is this metho
18、d.Whatever you do in the future, use this method.12. The design idea and application scope of the single chip microcomputer.Name four commonly used sensors and state their corresponding applications.Temperature sensor pressure sensor humidity sensor infrared sensorThe composition and working process
19、 of feedback control system are briefly described.With the first question15. Describe the composition, working principle and operating procedures of a Marine electric or control system.Direct acting cooling water temperature control systemPrinciple: the pressure of low-boiling work medium is changed
20、 in proportion to the temperature with the temperature proportional to the temperature, and directly drives the three-way regulating valve to change the water flow of the water.Composition: thermostatic valve, temperature box, transmission mechanism, valve body16. Name the commonly used input and ou
21、tput devices in the computer.Input device: printer, keyboard, mouse, scanner, tabletOutput device: monitor, printer, projectorCombine an industrial system to say which links are used in automatic control.18. Please name the disciplines that are closely related to the control engineering field.19. Ta
22、lk about the purpose of your postgraduate study and the industry you intend to pursue during your postgraduate study.Study the professional knowledge of the direction, enhance the practical ability, the amateur time to understand the industry background knowledge.In the future, we would like to use
23、our own skills, develop our shipping industry, and contribute to our country from a shipping power to a shipping power.Please state a system or phenomenon that you think the examiner may not understand.Practice topic1. Demonstrate the ability of computer operation to fully demonstrate the technology
24、 mastered.2. Select a theory to derive and demand full display of the rigor of logic.Lagranges mean value theorem3. Talk about personal practice ability in combination with something that has been experienced.4. Please state your most familiar industrial system and its operating mechanism, and indic
25、ate which areas need further improvement or improvement.5. Try the use of multimeter or other electrical tools.The multimeter detects the polarity and the good or bad of the ordinary diode.Detection principle: according to the diodes one-way conductivity this characteristic performance good diode, i
26、ts forward resistance is small, the reverse resistance is large; The bigger the difference, the better. The performance of the diode is either not good or has been damaged.When measuring, select the ohm block of the multimeter. R x100 or R XLK is normally used instead of Rx1 or R x10k block. Because
27、 the current of the Rxl block is too large, it is easy to burn the diode, and the internal power voltage of R xl0k block is too large, and the diode is vulnerable to breakdown.Measurement method: the two rods were connected to the two electrodes of the diode respectively and read the measured resist
28、ance. Then you can measure it again and remember the second resistance. If the difference between the two values is large, the diode performance is good. And based on the table bar (which is called a forward connection), which measures the small resistance of the meter, it is concluded that the diod
29、e is connected to the black table rod, which is connected to the red meter rod to the negative pole of the diode. Because the inner power of the multimeter is connected with the - socket of the multimeter,The negative pole of the internal power supply is connected with the + jack of the multimeter.I
30、f both measurements are small, the diode has been punctured; If the two measurements are very large, the inside of the diode is broken: the difference between the two measurements is not significant, and the diode performance is not good. In these cases, the diode cannot be used.It must be pointed o
31、ut that, due to the non-linear volt ampere characteristic of the diode, different resistance of the diode can be obtained by the different electrical resistance of the multimeter. When used in practice, the current that flows through the diode will be larger, so the resistance of the diode will be s
32、maller.The universal tester triodeTips: three upside down, find base; PN junction, fixed tube type; shun arrow, deflection large; uncertainty, moving mouth. Lets explain this sentence by sentence.One, three upside down, find the baseTest the triode to use the ohms of the universal meter, and choose
33、R x 100 or R x 1k stops. It is assumed that we do not know whether the triode is np-n-p-n or PNP, and can not tell which electrodes are the electrodes. The first step of the test is to determine which pin is the base. At this point, we shall take two electrodes (such as these two electrodes are extr
34、emely 1, 2), and use the two meters of the meter to reverse the positive and reverse resistance of the meter, and observe the deflection Angle of the dial; Then, one or three electrodes and two or three electrodes were taken to reverse the positive and reverse resistance of the two electrodes, and t
35、he deflection Angle of the watch needle was observed. In these three inverse measurements, there must be a similar measurement: a deflection of the needle in the inverted measurement, a small deflection at a time; The rest of the time, its going to be a very small deflection Angle, and this time its
36、 the base that were looking for.2. PN junction, fixed tube typeAfter finding the base of the triode, we can determine the type of conduction of the tube based on the direction of the PN junction between the base and the other two electrodes. Contact the base with the black surface of the multimeter,
37、 the red surface contact with either electrode of the other two electrodes, and if the pointer deflection Angle is very large, the triode is the NPN tube. If the pointer deflection Angle is small, the measured tube is PNP type.Three, the shun arrow, deflection bigYou find the base b, the other two e
38、lectrodes which are the collector c, and which is the emitter e? At this point we can determine collector c and emitter e by using the method of measuring the current ICEO. (1) for NPN triode, the measurement circuit of the penetrating current is shown in figure 3. According to this principle, measu
39、red with a multimeter of black and red pens and reverse the poles between the positive and reverse resistance Rce and Rec, even though the two measurement multimeter pointer deflection angles are small, but look closely, there will always be a deflection Angle is larger, the flow of electric current
40、 must be at this time: black pens and - c extremely extremely - b a - e - red pens and current flow to coincide with transistor symbol in the arrow direction ( down arrow ), so at this time must be collector c, black pens and receive red pens and must be pick up by the emitter e. (2) for the PNP tra
41、nsistor, reason is similar to the NPN, its current direction must be: the black pens and - e very great - b - c - red pens and extremely, also with the current of the transistor symbol in the direction of arrow is consistent, so the black pens and e must be pick up by the emitter, and red pens and m
42、ust be pick up by the collector c.Four, cannot measure out, move mouthIf in the process of shun arrowhead, deflection large, if it is too small and difficult to distinguish between the two measured Pointers, the mouth will be moved. Specific method is: in the down arrow, large deflection measure twi
43、ce, with both hands respectively hold two pens and with pin junction, with live his mouth (or against) with the tongue base electrode b, still use the down arrow, large deflection discriminant method can distinguish the collector and emitter e c. The human body ACTS as a dc bias resistor to make the
44、 effect more obvious.The use of multimeterThe dial (in the case of type 105) is shown in the right image.Change the measuring program and measuring range by switching the knob of the switch. The mechanical zero knob is used to keep the needle at rest in the left zero position. zero when the knob is
45、used to measure the resistance to zero at the right hand side, to ensure that the measurements are accurate.The measurement range of the multimeter is as follows: dc voltage: 5 files - 0-6V; 0 to 30 v. 0-150 - v; 0-300 - v; 0-600 - v. ac voltage: 5 files - 0-6v; 0 to 30 v. 0-150 - v; 0-300 - v; 0-60
46、0 - v dc current: sub-3, 0-3ma; 0 to 30 ma; 0-300 ma. resistance: 5 files - R * 1; R * 10; R * 100; R * 1 k; R * 10 kResistance measurement: - to put together a table rod short circuit, make the cursor around to the right, then zero adjustment knob, make the cursor just to zero. Then put the two rod
47、s respectively contact resistance being measured (or circuit) at both ends, read pointer in ohms the reading on the scale line (first line), multiplied by the digital file target, the resistance of the resistance is measured. For example, the resistance is measured in R * 100, and the pointer to 80
48、is 80 * 100 = 8K. For scale line left reading more dense, hard to target, so should choose appropriate ohms range measurement. Make a pointer to the middle or right part of the calibration line so that the readings are clear and accurate. Each time shift, should rearrange the two table rods short, recalibrate the pointer to zero, ability to measure correctly.To measure dc voltage: - first estimate the size of the voltage being measured, and then turn the switch