Thread Content
Instrument workers must know the rules and regulations: Safety Education Management Regulations: 1. 3. 1 "Safety Law" will be implemented from (November) (2002) (1) Answer, yes, team safety work management regulations 2.3.1 Petrochemical Occupational Safety and Health: Adhere to the (safety first), (prevention first) policy answer, and the industrial fire safety management regulations 3.3.1 A fire permit must be obtained for on-site fires 1. Answer, yes 3. 3. 2. The hot fire in the process equipment area during operation or startup or shutdown is a first-level hot fire (√). Regulations on safety management of limited space operations 1. 1. 1 Answer: Safety management regulations for working at heights 1. 1. 1 High-altitude operations refer to operations performed at locations where the fall height reference plane is greater than or equal to (B) and where there is a possibility of falling. A 1M B 2M C 3M D 5M Answer B Temporary power safety management regulations 1. 1. 1 Answer Regulations on Safety Management of Toxic and Hazardous Positions 1. 1. 1 Answer Post inspection system 1. 1. 1 Answer Basics: Record and fill in basic knowledge 2. 1. 1 Answer: Basic knowledge of picture recognition 2. 1. 1 Answer Basic knowledge of quality, safety and environmental protection 2. 1. 1 Answer Basic knowledge of chemical analysis 2. 1. 1 Answer Basic knowledge of chemical engineering 2. 1. 1 Answer Basic knowledge of measurement 2. 1. 1 Answer Basic knowledge of chemical machinery and equipment 2. 1. 1 Answer Basic knowledge of electrician 2. 1. 1 Under normal circumstances, bare metal parts that are not electrified but may come into contact with dangerous voltages should do (C,). A. Screen grounding B. Working grounding C. Protective grounding Basic knowledge of instrument 2. 1. 39 The thermoelectric properties of a thermocouple are determined by the electrode material of the thermocouple. Answer: Right 2. 1. 57 Actuators can be divided into pneumatic, hydraulic and electric according to their energy form. Answer: craft skills: Driving preparation and parking operation 3. 1. The 1101-J interlock protection system consists of process trip, ascites fluid level interlock, suction tank fluid level interlock, condition monitor interlock, WOODWARD speed regulator interlock, oil pressure interlock, and manual emergency stop. Answer: 4. Use and maintain equipment. 1. 1. The standard instrument used for calibration should have a valid calibration certificate, and the absolute value of its basic error should not exceed the absolute value of the basic error of the instrument being calibrated (B,). A 1/2 B 1/3 C1/4 Answer Equipment maintenance 4. 1. 1 Answer Accident Judgment and Handling 2.2.1 The “three no harms” of safety management refer to (ABC). A Do not harm yourself B Do not harm others C Do not be harmed by others D None of them 2.2.2 Several conditions that must be met for combustion are (ABC). A Combustible material B Combustion-supporting material C Ignition source D High temperature 2.2.3 The basic methods of extinguishing fire are (ABCD). A Cooling fire extinguishing method B Isolation fire extinguishing method C Suffocation fire extinguishing method D Suppression fire extinguishing method 2.2.4 Which of the following situations is a serious personal injury accident (ABCD). A More than 11 people were slightly injured at one time B 3 to 10 people were seriously injured at one time C 1 to 2 people were killed at one time D None of the above : Safety skills and use of fire fighting equipment 6. 1. 1 Answer: Use of safety protective equipment 6. 1. 1 answer: Use of first aid supplies 6. 1. 1 Answer to DCS part 1. To call up the flow chart screen, press on the keyboard: (B) A. DETAIL B. SCHEM C. GO TO 2. The following key is only valid in the group screen (C) A. PRINT DISP B. SYS STATS C. HOUR AVG 3. There are ( ) US stations and ( ) GUS stations in the olefin control room: (A) A. 8; 2 B. 7; 3 C. 9; 1 4. The node number of HM is: (C) A. 21 B. 22 C .31 5. When copying the screen, press: (B) A. CANCEL PRINT B. PRINT DISP C.PRINT TREND 6. The TDC-3000 distributed control system is expanded and developed on the basis of the original TDC-2000 system. (True) 7. Olefin DCS control stations are redundant. (True) 8. DCS can communicate with PLC. (True) 9. DCS control system can be summarized as: Centralized management part, decentralized control part, communication part. (Correct) 10. DCS network communication experiment, on the system status screen, confirm that the cable status of network channels A and B is displayed in green. (Correct) Multiple choice question: The bending radius of the metal pipe is not less than the outer diameter of the pipe (B,). A． 3 times B. 4 times C． When the pressure difference between the front and rear of the regulating valve remains unchanged at 5 times, the relationship between the relative flow rate of the regulated medium flowing through the valve and the relative stroke of the valve is called (B,) of the regulating valve. A． Flow characteristicsB. Ideal flow characteristics C. Working flow characteristics In actual use, the pressure difference between the two ends of the regulating valve changes. At this time, the ratio of the maximum flow rate and the minimum flow rate that the regulating valve can control is called (C,) of the regulating valve. A Adjustable ratio B Ideal adjustable ratio C Actual adjustable ratio For the adjustable ratio of the control valve, the cut-off valve has a greater impact than the bypass valve (B,). A large B small intrinsically safe circuit itself is not grounded, but when the instrument function requires grounding, the provisions of (C,) should be followed. A. Owner's requirements B. Design documents C. Instrument installation and operating instructions The stability of the adjustment system is the most basic requirement for the adjustment system. The attenuation rate ψ of the stable adjustment process should be (C,). Aψ=0 Bψ＜0 C0＜ψ＜1 Dψ=1 Can it play a regulating role by directly controlling the regulating valve with the output of the transmitter? (C,). A can B cannot C depends on the control requirements. The determination of the positive and negative effects of the regulator in the regulating system is based on (B,). A realizes the positive feedback of the closed loop B realizes the negative feedback of the closed loop C The system amplification coefficient is just bad for the safety of production D The parallax caused by improper reading by the user is (B,). A Random error B System error C Negligent error The damping characteristics and pointer movement speed of the calibrated instrument should comply with (B,) or the instrument installation and operating instructions. A design document B * * The instrument professional standard C instrument technical regulations corrects the temperature, pressure, etc. in the flow measurement of the throttling device (C,). A Negligent error B Accidental error C System error The net distance between the laid instrument signal lines and electrical equipment with strong magnetic fields and strong electrostatic fields should be greater than (B,). A 0.5m B 1.5m C 2mDCS system operation point check should confirm the (B,) value operation module. A PV B SP C OP The minimum load of the pulse output is specified as 10KΩ. If the load is less than 10KΩ, the pulse receiver receives the signal (A,). A. The amplitude is not enough. B. The frequency is reduced. C. The current is reduced. Use a throttling device to measure the volume flow rate of the dry gas part of the wet gas (under standard conditions). If the relative humidity under working conditions increases compared to the design value, the indicated value of the instrument will be (A, ). A is greater than the true value, B is equal to the true value, C is less than the true value, and the measuring range of the differential pressure variable air supply lever is different, mainly due to the (C,) of its measuring bellows box. A Different thickness B Different material C Different diameter If the polarity of the 1151 air supply power supply is reversed, the instrument will be (B,). A. Burned out. B. No output. C. The output runs to the maximum. The DCS system equipment should be installed (C,). When moving or moving the control room and machine room, the ground must not be damaged and should be fixed in time after it is in place. A from near to far B from complex to simple C from far to near The flow source location shown in the figure is correct for (A,). A Gas B Liquid C Steam D High viscosity fluid E Precipitating fluid The fluid flow direction of the rotameter is (B,). A Top-down B Bottom-up C Top-down or bottom-up can be used. When the YF100 vortex flowmeter is at full scale, the output frequency of the transmitter is 140HZ, and the frequency when the flow rate is 25% is (A,). A140×25%=35HZ B140×√25%=70HZ The maximum load capacitance of the YF100 vortex flowmeter pulse output is 0.22μF. If the load capacitance is greater than 0.22μF, the pulse receiver receives the signal (C,). A. The frequency decreases. B. The frequency increases. C. The amplitude is not enough. D. The amplitude increases. There is an instrument constant on the factory certificate of the turbine flow transmitter, which is (B,). A is calculated theoretically, B is actually calibrated, C is estimated based on past experience and is designed as a dual-CPU redundant PLC system. (C,) should be checked during debugging. A Main CPU attack function B Backup CPU function C Switching between main CPU and backup CPU When measuring the liquid level of an open container using the pressure method, the level of the liquid level depends on (B,). A. The position of the pressure taking point and the cross section of the container. B. The position of the pressure taking point and the medium density. C. The medium density and the cross section. The float of the torsion tube float level meter falls off, and the meter indicates (A,). A is the maximum, B is the minimum, and C remains unchanged. When measuring the liquid level of a container using the differential pressure method, the level of the liquid level depends on (C,). A. The pressure difference between the upper and lower points of the container and the container cross-section B. The pressure difference, the container cross-section and the medium density C. The pressure difference, the medium density and the pressure point position. The larger the measurement range of the torque tube float level meter of the same model, the diameter of the float (C,). The larger A is, B remains unchanged, and the smaller C is, liquids that do not crystallize or become viscous at the operating temperature, but may crystallize or become viscous at ambient temperature, should use (A,). A. Internal float level gauge B. External float level gauge The liquid in process equipment that does not allow easy parking should be selected (B,). A. Internal float level gauge. B. External float level gauge. Which of the following descriptions about resistance thermometers is inappropriate (D,). A The working principle of a resistance thermometer is to use the resistance of a metal wire (such as a platinum wire) to change almost linearly with temperature. B. Resistance thermometers have the disadvantage of time delay when detecting temperature. C. Compared with resistance thermometers, thermocouple thermometers can measure higher temperatures. D. Because the resistance wire of the resistor body is made of thicker wire, it has stronger vibration resistance. When the programmer executes the program, its mode switch should be placed in the (A,) position. A RUN B PRG C The I/O check of the LOADPLC system is performed after the system (A,) is completed. A. Power on B. Installation C. Check whether the voltage of the standard battery can be measured with a multimeter (A,). A can be used but B cannot be used. The megohmmeter has three terminals, and their marking symbols are L, E, and G, which represent (A, ) respectively. A line, ground, screen B screen, line, ground C ground, line, screen D line, screen, ground intrinsically safe lines and their accessories should have durability (C,) marks. A red B yellow C blue widely used austenitic stainless steel, also known as stainless acid-resistant steel, its expression method is (B,). A 1Cr13 B 1Cr18Ni9Ti C Cr18Ni12Mo2Ti When degreasing an instrument that is not easy to disassemble, the method of pouring the degreasing solvent can be used, and the soaking time after pouring should not be less than (B,). A 1 hour B 2 hours C 3 hours The appropriate ambient temperature for painting construction is (A,). A 5℃~40℃ B 10℃~30℃ C 15℃~40℃ The length of the two ends of the wall-penetrating protective pipe (or protective cover) extending out of the wall should not be greater than (B,). A 15mm B 30mm C 25mm Explosion and fire hazard places are divided into several categories and levels (C,). A, Category 2, Level 5, B, Category 3, Level 6, C, Category 3, Level 7, explosion-proof instrument boxes with positive pressure ventilation must be kept clear, and (A,). A. It is not suitable to install a cut-off valve. B. A cut-off valve must be installed. Use an electronic potential difference meter to measure the temperature of the thermocouple. If the hot end temperature rises by 2°C and the room temperature (cold end temperature) drops by 2°C, the instrument will indicate (A,). A increased by 2℃ B decreased by 2℃ C remained unchanged D increased by 4℃ 1. In the nozzle baffle mechanism, the diameter of the orifice is larger than the diameter of the nozzle (B,). A is big, B is small, C may be big, or it may be much smaller. a) ABI errors can be divided into (BD) according to the rules of occurrence. 1. A Relative error B System error C Dynamic error D Negligence error 1. The standards, specifications, and procedures mainly based on the construction of petrochemical instrument engineering are (A, B, C, D, E,). A SHJ521—91 B GBJ93—86 C GBJ131—90 D SH3503—93 E GBJ93—92 2. (A,) in the mnemonic of the SLPC programmable regulator function module represents basic PID control. A BSC B CSC C SSC D LED 3. In the infrared absorption gas analyzer, if the detection gas chamber window is contaminated, it will cause the instrument (A, B,). A The zero point of the indication value increases B The zero point of the indication value decreases C The sensitivity level increases D The indication value is unstable 2. In-place meter 2. 033 ABI’s statement about the accuracy grade of the instrument is wrong (BCD) 1. A The accuracy grade of the instrument refers to the maximum allowable value of the error of the instrument 2. B The accuracy grade of the instrument refers to the basic error of the instrument 3. C The accuracy grade of the instrument refers to the basic error of the instrument 4. D The accuracy grade of the instrument refers to the maximum error of the instrument 3. 034 ABI has a QBC pneumatic differential pressure transmitter whose output cannot reach the maximum. One of the following reasons (AD) can cause the above phenomenon: 1. A. The air source pressure is too low. B. The negative pressure conduit is blocked. 2. C. The feedback bellows is leaking. The commonly used measures are (ABCD) 1. A Change the working range of the spring B Add a positioner 2. C Increase the air source pressure D Use a small stiffness spring 5. 036 ABI’s following error about the rotameter is (AD) 1. A The pressure loss of the rotameter is large and changes with the flow 2. B The tapered tube of the rotameter must be installed vertically and cannot be tilted 3. C The requirements for the straight pipe on the upstream side of the rotameter are not strict 4. D The contamination of the float has little effect on the accuracy 6. 037 The shorter the ABI integration time, the following description is incorrect (ACD) 1. A The slower the integration speed, the stronger the integration effect, the faster the residual error is eliminated 2. B The faster the integration speed, the stronger the integration effect, the faster the residual error is eliminated 3. C The slower the integration speed, the weaker the integral effect, and the slower the residual error is eliminated 4. D The faster the integration speed, the stronger the integration effect, and the slower the elimination of residual errors. 7. 038 The advantages of ABI armored thermocouples are (ABCD) 1. A. It has good mechanical properties and can withstand strong impact and vibration. 2. B. It can be bent arbitrarily and adapts to the requirements of complex structural devices. 3. C. It can be used as a temperature measurement element and can be installed into ordinary thermocouple protection tubes. 4. D. Its outer diameter can be made very thin, so the time constant is small and the response speed is fast 8. 039 ABI The following are primary instruments (ABD) 1. A Bimetal thermometer B Pressure transmitter 2. C Pneumatic local regulator D Float transmitter 9. 040 ABI's following maintenance and storage measures for instruments are correct (ABC) 1. A Handle with care B Wipe with cotton yarn 2. C Place in a dry room D Place around a strong magnetic field 10. 041 ABI's statement about semiconductors is incorrect (ABC) BCD) 1. A Semiconductor is a substance with electrical conductivity between conductor and insulator 2. B Semiconductor is half conductive and half non-conductive 3. C Semiconductor is superconductor 4. D Semiconductor is a processed insulator 11. 042 BBA’s statement about the use and maintenance of standard resistance boxes is correct (ABC) 1. A The temperature of the place of use should be constant, and there should be no direct light irradiation 2. B It should be handled with care when moving. Severe vibration or impact will cause damage to the stability of the resistance value. 3. C The factory certificate and calibration data over the years should be well preserved for more precise measurement, which can be used as reference data for corrections. 4. D None of the above statements are correct. 12. 043 ABI's following statement about electromagnetic flowmeters, the correct one is (ACD) 1. A The flowmeter can never be installed at the suction end of the pump 2. B The calibration of the electromagnetic flowmeter is simple. No matter what medium the flow rate is detected, it can be calibrated with water. 3. C In order to ensure the detection accuracy, it should be installed at the highest point of the pipeline laying. 4. D Since its sealing is affected by pressure and temperature, it is limited. The use range is the pressure below 1.6Kpa and the temperature within the range of 5℃~60℃ 13. 044 The selection of ABI pressure pipe is related to the measured medium (ABC) 1. A Physical properties B Chemical properties C Operating conditions D None of the above 14. 045 ABI The following flowmeters are positive displacement flowmeters (BCD) 1. A Turbine flowmeter B Roots flowmeter 2. C Oval gear flowmeter D Rotating piston flowmeter 15. 046 The use range of ABI pressure gauge is generally 1/3~2/3 of its range. If it exceeds 2/3, the impossible phenomena are as follows (AB) 1. A The joint or welding joint will leak B The transmission mechanism of the pressure gauge should be deformed 2. C The accuracy will decrease over time D The relative error will increase 16. 047 ABI should choose the adjustment parameters so that the adjustment channel should be as small as possible (BC) 1. A The amplification coefficient is appropriately small B The time constant is appropriately small 2. C The lag time should be as small as possible D The deviation signal should be as small as possible 17. 048 ABI requires small flow resistance, no leakage, and the adjustment of highly corrosive media should not be selected (ABD) 1. A Eccentric rotary valve B Butterfly valve C Diaphragm valve D Cage valve 18. 049 ABI single-loop PID The static state of the fixed value regulation system is (CD) 1. A The regulator deviation is a constant value B The regulating valve opening is zero 2. C The regulator deviation is zero D The regulating valve opening is stable 19. 050 In the ABI automatic regulating system, the direction of action is (ABCD) 1. A Transmitter B Regulator C Regulating valve D Object 20. 051 BBB's correct description of the role of lubricating oil in large units is (ABD) 1. A forms an oil film between the shaft and the bearing, reducing the friction between the shaft and the bearing 2. B takes away the heat generated by the friction between the shaft and the bearing 3. C prevents the damage of the oil film from causing vibration of the unit 4. D participates in the interlocking protection of the unit 21. 052 ABI The following circuits that cannot suppress zero point drift are (ABD) circuits 1. A DC amplifier B Common emitter multi-stage coupling C Differential amplifier D Rectifier 22. 053 ABI DCS is generally composed of (ABCD) 1. A Process input/output interface unit B Process control unit 2. C CRT operating station D High-speed data path 23. 054 ABI In order to reduce and prevent the impact of vibration on instrument components and measurement accuracy, ABI usually uses (ABC) 1. A Add a buffer B Install a rubber leather cushion to absorb vibration 2. C Add damping device D None of the above 24. 055 BBA The reasons for malfunction of the signal alarm and interlocking system are (ABCD) 1. A Power loss or voltage fluctuation range exceeding the limit B Logic component damage or relay failure 2. C Actuator failure D Connecting wire short circuit or open circuit 25. 056 BDA The fire extinguisher that can be used to extinguish live equipment fires is (AB) 1. A dry powder fire extinguisher B Carbon dioxide fire extinguisher 2. C Foam fire extinguisher D None of the above 26. 057 BBA intelligent electric valve positioner is generally composed of (ACD) components 1. A microprocessor (CPU) B feedback mechanism 2. C piezoelectric guide controlled pneumatic valve DA/D and D/A converter 27. 058 ABC QHSE management system includes the following (ABCD) management system 1. A Quality B Safety C Environment D Health 28. 059 ABI Air Blowing Liquid Level Gauge When the liquid level rises, which of the following statements is incorrect (BCD) 1. A. The liquid seal pressure increases, so that the amount of gas and liquid escaping from the conduit decreases. 2. B. The liquid seal pressure increases, so that the amount of gas and liquid that escapes from the conduit increases. 3. C. The liquid seal pressure decreases, so that the amount of gas and liquid that escapes from the conduit decreases. 4. D The liquid seal pressure decreases, so that the amount of gas and liquid escaping from the conduit increases. 29. 060 ABI The following PLC programming languages and programming methods are (AC) 1. A Function block B BASIC C Ladder diagram D Assembly language 30. The polypropylene device belongs to a Class A explosion-proof workshop, and the main raw materials are as follows (ABCD), all of which are flammable and explosive items. i. A propylene B hydrogen C hexane D AT and H catalyst 31. In the DCS system, the loop connection mode is (AB). i. A hard point connection B soft point connection C check mark connection D none of the above 32. The distributed control system is composed of (ABCD) several parts. i. A. Process input/output interface unit B. Process control unit C. CRT operating station D. High-speed data path 33. Petrochemical automation systems generally include (ABCD) systems. i. A Automatic detection B Automatic measurement C Automatic operation D Automatic signal interlock protection 34. The corrective measures for the 3051 transmitter not communicating with the handheld terminal are (ABCD). i. ACheck the power supply voltage to the transmitter (minimum is 10.5V) ii. BCheck the load resistance of the transmitter (minimum value is 250Ω) iii. C Check whether the address of the transmitter is correct iv. D Replace the electronic circuit board 35. In order to illustrate the technical performance of the instrument, symbols corresponding to the technical performance of the instrument are marked on the dial. The meaning of these symbols indicates (ABCD). i. A unit of measurement B type of current C working principle of the instrument D accuracy level 36. The catalyst of the polypropylene device includes (ABC). i. AH Catalyst B AT Catalyst C OF Catalyst D FCC Catalyst 37. DCS loop test, confirm the (ACD) relationship when doing logic point check. i. A Logic B Accumulation C Sequence D Preset 38. What components does a filtering gas mask consist of (ABCD). i. A Mask B Air tube C Canister D Backpack 39. The communication network of the distributed control system has several structural forms (ABCD). i. A star network structure B ring network structure C bus network structure D combined network structure 40. Commonly used safety voltage (ABD). i. A 12V B 24V C 110V D 36V 41. The ways in which industrial poisons enter the human body are (ABC). i. A Respiratory tract B Skin C Respiratory tract D Stomach 42. The hazard classification (ABCD) of occupational exposure to poisons in my country. i. A Extreme B High C Poisoning D Mild hazard 43. The composition of liquefied petroleum gas is (ACD). i. A propane, butane B hydrogen, oxygen C propylene, butylene D butylene 44. There are several situations in which the human body gets electric shock (ABC). i. A Single electric shock B Two electric shocks C Step voltage electric shock D None of the above 45. During debugging of smart meters, which of the following parameter configurations should generally be checked (ABCD). i. A Engineering unit B Range C Output mode D Damping time 46. According to the method of expressing the error value, it is divided into (BCD). i. A System error B Absolute error C Relative error D Reference error 47. Commonly used parameters of automatic adjustment systems, the setting methods are (ABCD). i. A. Empirical method B. Decay curve method C. Critical proportionality method D. Reaction curve method 48. PLC includes (ABCDE). i. A power supply B input image area C output image area D central processor E communication module 49. The three-way solenoid valve can be divided into (ABC). i. A Ordinary type B Waterproof type C Anti-explosion type 50. The pressure thermometer mainly consists of three basic parts (ABC). i. A. Temperature bulb B. Air regulating tube C. Spring tube pressure gauge D. None of the above are correct 51. The conditions for thermoelectric potential generated by thermocouples (ABC). i. A. The middle conductor B. The materials of the two poles are different. C. The temperatures of the two contacts are different. D. None of the above are correct 52. What are the basic control systems (ABC)? i. A cascade adjustment system B proportional adjustment system C split-range control system D feedforward control system 53. Total quality management activity groups can be roughly divided into (ABCD) types. i. A On-site type B Public relations type C Management type D Service type 54. The regulating valves especially suitable for slurry materials are (ABCD). i. A ball valve B diaphragm valve C valve body separation valve D butterfly valve 55. The artificial respiration method is divided into (ABCD). i. A Supine style B Prone style C Free style D Kissing style 56. What are the safe colors (ABCD). i. A Red B Yellow C Blue D Green 57. It is prohibited to use metal parts made of (ABD) materials and their coatings to connect the electrical connectors, fasteners, conductors and grounding bodies of those with "X" or Z after the anti-explosion certificate of quality and safety products. i. A Cadmium B Zinc C Silver D Magnesium 58. The loop connection methods in the DCS system include metal parts made of (AB) materials and their coatings. i. A Hard point connection B Soft point connection C Correct connection D All of the above are correct 59. The selection of the form of the regulator of the cascade regulation system is mainly based on (ABC). i. A. Process requirements B. Object characteristics C. Interference properties D. Environmental conditions 60. When using a double-flange differential pressure transmitter to measure liquid level, the migration amount is related to (BCD). i. A. Installation position of the transmitter. B. Density of the measured medium. C. Density of the connection number and isolating fluid. D. Position of the pressure-taking point. 61. In the isolated safety barrier, the energy limiter has the function of (BC). i. A. Resistance limiting B. Current limiting C. Voltage limiting D. Isolation 62. The loop connection methods in the DCS system include metal parts made of (AB) materials and their coatings. i. A Hard point connection B Soft point connection C Match number connection D All of the above are correct 63. Currently, the fire extinguishers produced in my country and suitable for our country include (ABC). i. A Dry powder fire extinguisher B 1211 fire extinguisher C Carbon dioxide fire extinguisher D All of the above are wrong 64. DCS is divided into (ABC) network layers. i. A field level B control level C monitoring level D management and control level 1. The basic control system consists of (ABCD) links. ii. A Measurement feedback link B Controller C iii. Actuator D Comparison link True or False question 1. The ideal flow characteristics of the control valve depend on the shape of the valve core (√). 2. The split-range regulating system is a regulator that controls multiple regulating valves at the same time (√). 3. When using a throttling device to measure flow, a differential pressure signal corresponding to the flow rate can be generated before and after the throttling device, and the two have a square root relationship (√). 4. The output change of the proportional regulator is inversely proportional to the deviation change speed (×). 5. The test pen can be used to identify the positive and negative poles of DC voltage. The rear end of the positive neon gas tube emits light, and the front end of the negative pole emits light (√). 6. Before installing the smart transmitter, in order to enable communication between the transmitter and the communicator, a resistor (×) of not less than 50 ohms should be connected in series in the loop. 7. The emergency stop interlocking system, referred to as ESS, is set up for the safety of the production process (√). 8. The essence of zero point migration is to change the instrument range (√). 9. The "four rates" of the instrument refer to the integrity rate, usage rate, leakage rate and control rate (√). 10. The thermoelectric characteristics of a thermocouple are determined by the electrode material of the thermocouple (√). 11. The stroke of the valve stem is inversely proportional to the input signal of the valve positioner (×). 12. There are measurement errors (√) in any measurement process. 13. The output of the main regulator is used as the reference of the auxiliary regulator. This regulation system is a cascade regulation (√). 14. The compressor inlet regulating valve should be an air shut-off valve (√). 15. The higher the accuracy of the standard table, the better (×). 16. If the power supply level of the 3051 transmitter is reversed, the mA reading will be 0 (√). 17. The explosion-proof instrument box using positive pressure ventilation must be kept clear, and it is not suitable to install a shut-off valve (√). 18. The so-called interlocking refers to the use of mechanical or electrical control to connect various related instruments and equipment in sequence so that they can communicate with each other to achieve the purpose of safe production (√). 19. Explosion-proof instruments refer to preventing explosions caused by the instrument when used in production sites containing explosive hazardous substances (√). 20. Firefighting work follows the policy of “prevention first, combining prevention with firefighting” (√). 21. It is the responsibility of team members to organize and carry out team safety activities and provide job safety education for new and old employees (×). 22. Requirements for safety education for personnel who change jobs, transfer jobs, or re-employ: Workshop and team education must be carried out, and only those who pass the examination can take up their posts. (√) 23. The molecular formula of propylene is C3H6 (√). 24. The template of the extrusion machine in this position is heated by hot oil (√). 25. The output of the asymptotic switch is an analog signal (×). 26. The larger the sensitivity limit value, the more sensitive the instrument is (×). 27. The residual error of the proportional adjustment process is proportional to the proportionality of the regulator (√). 28. Flow refers to the amount of fluid flowing through a certain section of the pipeline per unit time (√). 29. The hysteresis is numerically equal to the insensitive area (×). 30. The difference between a distributed control system and a fieldbus system is that the controller and field instruments of the distributed control system are two network layers, while the controller and field instruments of the fieldbus are hung on one bus (√). 31. If the orifice plate is installed upside down, the indication of the differential pressure gauge will become smaller (√). 32. The working ground and shielding ground can share the same ground (√). 33. The boiling point of water decreases as the pressure decreases (√). 34. One reaction involves the thermal cracking of raw material hydrocarbons to produce ethylene and propylene, and the reaction that produces the target product is determined to be the main reaction (√). 35. Chemical production processes are divided into chemical processes and physical processes (√). 36. All instruments in the DDZ-3 type are safety spark-type explosion-proof instruments (×). 37. The DDZ-3 type with a safety barrier is called a safety spark type explosion-proof instrument (×). 38. The boiling point of water increases as the pressure increases (√). 39. In pneumatic PI control, the larger the opening of the integral valve, the stronger the integral effect (√). 40. The main paint used to prevent atmospheric corrosion is red single anti-rust paint (√). 41. In the CENTUM system, when the key lock position of the operator keyboard is set to "ON", the operator keyboard can be used to modify the system group (×). 42. The temperature measurement range of the thermal resistor is wider than that of the platinum thermal resistor (×). 43. Fires in process equipment that are in operation or during start-up or shutdown are classified as first-level fires. (√)