Question bank source: Safety production mock test, one-stop public account applet
The chemical automation control instrument exam question reference answers and the analysis of the chemical automation control instrument exam questions are a summary of the safety production mock exam one-point question bank teachers and the students who have taken the chemical automation control instrument operation certificate, which is relatively effective in helping the students of the chemical automation control instrument exam paper to pass the exam successfully.
1. [Multiple choice] () determines the sealing structure of the solenoid valve. （ B ）
A. Working pressure
B. Properties of the medium
C. Working temperature
2. [Multiple Choice] () refers to the ability of a function module to continue to perform a specific function in the event of a failure or error. （ A ）
A. Fault tolerance
B. Redundancy
C. Fail-safe
3. [Multiple Choice] () The relative change value of the flow rate of the valve in the opening hour is large, the sensitivity is high, it is not easy to control, and even oscillation, while in the large opening, the relative change value of the flow is small, the adjustment is slow, and it is not timely enough. （ C ）
A. Quick opening feature
B. Equal percentage characteristics
C. Linearity
4. [Multiple Choice] In the CENTUMCS3000 system, each domain can define up to () HIS. （ B ）
A、8
B、16
C、48
D、65
5. [Multiple choice] The communication mode of HART protocol is a () communication mode. （ B ）
A. Simulation
B. Analog and digital mixing
C. Numbers
6. [Multiple Choice] "M3; /h; L/h" are all units of flow, and they represent the unit of flow (). （ A ）
A. Volume
B. Quality
C. Speed
7. [Multiple choice question] The valve with the highest pressure recovery coefficient in the following valves is (). （ C ）
A. Double-seat valve
B. Single-seat valve
C. Butterfly valve
8. [Multiple Choice] The purpose of the cascade control system is to improve the control quality of the main variables, and () needs to be set up to achieve this purpose. （ C ）
A. Sub-controller
B. Sub-object
C. Minor variables
9. [Multiple Choice] When the regulating valve through DN≤50 is installed on site, the minimum distance between the center line of the valve body and the ground or the object at the lower end of the valve is (). （ A ）
A、400mm
B、300mm
C、500mm
10. [Multiple Choice] The mass of the fluid flowing through the unit cross-sectional area per unit time is called (). （ B ）
A. Flow rate
B. Mass flow rate
C. Average flow rate
11. [Multiple choice question] Pedestrians in the factory should pay attention to the wind direction and wind force to prevent being harmed by toxic gases in sudden accidents. When encountering a situation, it is necessary to detour, stop, (). （ B ）
A. Go with the wind
B. Go against the wind
C. Walking
12. [Multiple Choice] In the structure of DCS, the control function configuration and system maintenance are (). （ C ）
A. Operation station
B. Control station
C. Engineer station
13. [Multiple choice question] In the automatic control system, it is necessary to control the production process of its process parameters. Production equipment or machines, etc., are called (). （ C ）
A. Manipulating variables
B. Controlled variables
C. Accused object
14. [Multiple Choice] In the case of large fluctuations in the measured pressure, the normal operating pressure value should not exceed () of the full scale of the pressure gauge. （ A ）
A、1/2
B、1/3
C、2/3
15. [Multiple Choice] For the interference channel, it should be as small as possible (). （ A ）
A. Magnification factor
B. Integration time
C. Differential time
16. [Multiple choice question] The automatic control system is divided into () according to whether and how the given value of the controlled variable that needs to be controlled by the process changes. （ C ）
A. Temperature control system, pressure control system, liquid level control system, flow control system
B. Distributed control system, programmable control system, emergency shutdown system
C. Constant value control system, follow-up control system and program control system
17. [Multiple choice question] The daily safety education of workers should be carried out with "weekly safety activities" as the main position, and the safety education assessment should be carried out on them. （ A ）
A. Once a month
B. Once a quarter
C. Once every six months
18. The English abbreviation of [Multiple Choice] Average No Expiration Time is (). （ B ）
A、MTTR
B、MTTF
C、MTTFS
19. [Multiple Choice] When the positive and negative pressure chambers of the differential pressure transmitter are connected to the working pressure, the zero position of the transmitter is inconsistent with the zero output of the positive and negative pressure chambers when the atmosphere is passed, and the difference is called (). （ C ）
A、偏差
B. Allowable error
C. Static pressure error
20. [Multiple Choice] When the measured liquid level is zero, the pressure acting on the positive and negative pressure difference of the differential pressure level gauge is not equal, and the method of () is needed to offset the fixed differential pressure. （ C ）
A. Zoom in
B. Cold end compensation
C. Migration
21. [Multiple Choice] When the valve body is upright and the valve stem moves down, the flow area between the valve core and the valve seat decreases (). （ C ）
A, positive action
B. Reaction
C. Gas off
22. [Multiple Choice] The frequency of alternating current in mainland China is ()Hz. （ B ）
A、60
B、50
C、100
23. [Multiple choice question] A certain process location requires the installation of a DN50 control valve with small leakage, then () can be selected. （ C ）
A. Straight-through double-seat control valve
B. Cage valve
C. Straight-through single-seat valve
24. [Multiple choice question] The outlet pressure of a compressor is 25MPa, and the maximum allowable measurement error of ±36KPa is allowed in actual operation, so the range and accuracy level of the pressure gauge are (). （ B ）
A、50MPa; Level 1.5
B、50MPa; Level 0.5
C、40MPa; Level 1.5
25. [Multiple Choice] If the relative flow rate (Q/Qmax) and the relative stroke (L/L) of a regulating valve are logarithmic, its characteristics are (). （ A ）
A. Equal percentage characteristics
B. Quick opening feature
C. Linearity
26. [Multiple Choice] Active metals and active non-metals can be formed when they are combined. （ A ）
A. Ionic bonds
B. Covalent bonds
C. Metal bonds
27. [Multiple choice question] When the fluid flows in the pipeline with a throttling device, the phenomenon of the difference in the static pressure of the fluid before and after the throttling device (upstream and downstream) is called the throttling phenomenon. （ A ）
A. Pipe wall
B. Die
C. Pipeline
28. [Multiple choice] The lubricating oil is removed by filtration (). （ B ）
A. Acidic impurities
B. Mechanical impurities
C. Alkaline impurities
29. [Multiple Choice] Temperature is the physical quantity that characterizes an object (). （ B ）
A. Whether it is hot or not
B. Degree of heat and cold
C. Whether it is cold
30. [Multiple Choice] Glass plate level gauge is a kind of instrument. （ C ）
A. Buoyancy type
B, Difference Formula
C. Direct-reading type
31. [Multiple Choice] When there is a serious water shortage in an industrial steam boiler, it cannot be immediately () in the first place. （ A ）
A. Water supply
B. Steam supply
C. Air supply
32. [Multiple Choice] The structure of the electromagnetic flowmeter is composed of two parts: the sensor and (). （ C ）
A. Measurement part
B. Electronic amplifier
C. Converter
33. [Multiple choice] The range and location of the red warning line (). （ C ）
A. The perimeter of the rescue area at the accident site
B. General toxic substance workplaces and the periphery of accident hazard areas
C. Highly toxic materials and radiation sites, close to the source of accident hazards
34. [Multiple Choice] The main purpose of setting up a sub-range control loop is (). （ A ）
A. Expand the adjustable range
B. Expand the flow coefficient
C. Reduce the adjustable range
35. [Multiple choice question] The material of the valve trim of the control valve is generally (). （ A ）
A. Stainless steel
B. Cast iron
C. Cast steel
36. [Multiple choice question] In order to facilitate batch production, the rotameter manufacturer calibrates the instrument with water or air and gives a curve when making a scale. （ C ）
A. Production practice
B. Non-standard
C. Standards
37. [Multiple Choice] Selection control is a kind of (). （ B ）
A. Follow-up control
B. Soft limit safety control
C. Interlock protection control
38. [Multiple Choice] The chemical bond formed between anion and cation through electrostatic action is called (). （ C ）
A. Covalent bonds
B. Hydrogen bonding
C. Ionic bonds
39. [Multiple choice question] In the distributed control system, the main function of the operation station is (). （ A ）
A. Operation and Monitoring
B. Control and communication
C. Control
40. [True or False] The function of the DCS remote I/O unit can place the I/O control unit on the site far away from the control room, and the data can be transmitted from the remote site to the main control room through communication transmission. （ √ ）
41. [True or False] After the PLC system configuration and configuration are completed, each input and output channel corresponds to a unique input and output address. （ √ ）
42. [True or False] In the SCADA system, for the server of the dispatch center, the two IO servers are redundant, if one server fails, the other server undertakes all the actual work without affecting the operation of the system. （ √ ）
43. [True/False] STEP7 can upload the program and configuration information in the CPU to the PG/PC project. However, only the entire content of a PLC can be uploaded to the project, and the user program block or hardware configuration information cannot be uploaded separately. （ × ）
44、【判断题】TMR(TripleModuleRedundant)的意思是双重模件冗余结构。 （ × ）
45. [True or False] TRICON system is mainly used for continuous quantity control I/O. （ × ）
46. [True or False] In a three-phase four-wire power supply line, the voltage between the end line and the middle line is called the line voltage. （ × ）
47. [True or False] The sensing components, structural principles, and safety production mock exams of intelligent transmitters of different manufacturers are all different, and the communication protocols are different. （ √ ）
48. [True or False] The surface temperature of the instrument is determined by the accumulated temperature of the instrument itself. （ × ）
49. [True or False] The use of the emergency shutdown system is to ensure that the device or independent unit stops quickly. （ × ）
50. [True or False] Deviation is the difference between the measured value and the given value, regardless of whether the positive or negative effect on the controller output is the same. （ × ）
51. [True or False] In the split-range control loop, the two-stage wind pressure range of the split-range valve must be equally divided into 0.02~0.06MPa and 0.06~0.10MPa. （ × ）
52. [True or False] The pressure calibrator is mainly used to verify and adjust the standard input signals of various differential pressure transmitters, low-pressure pressure transmitters, regulators and recorders. （ × ）
53. [True or False] One of the bases for the selection of the type of pressure gauge is the properties of the medium to be measured, that is, physical properties and chemical properties. The measured medium has high temperature, viscosity, degree of dirtiness, corrosiveness, crystals, flammability, explosiveness, oxidation-reduction properties or special media. （ × ）
54. [True or False] When installing the double flange level gauge, it is necessary to pay attention to the position of the positive and negative pressure chamber not to be installed incorrectly, the positive pressure chamber is installed on the pressure port above the equipment, and the negative pressure chamber is installed on the pressure port under the equipment. （ × ）
55. [True or False] A safety spark type explosion-proof instrument is used in a dangerous place, which constitutes a safety spark type explosion-proof system. （ × ）
56. [True or False] Positive pressure explosion-proof instrument boxes should not be set up in explosion hazard places, and non-explosion-proof instruments and other electrical equipment should be installed inside. （ × ）
57. [True or False] When the measured pressure is relatively stable, the normal operating pressure value should not exceed 2/3 of the full scale of the pressure gauge; The maximum must not exceed 3/4 of the full scale. （ √ ）
58. [True or False] In the selection control system, the two controllers work at the same time. （ × ）
59. [True or False] The important role of installing the valve positioner is that it can be used to eliminate the instability of the actuator film and spring, as well as the dry friction influence of each movable part, so as to improve the accurate positioning and reliability of the control valve. （ √ ）
60. [True or False] For containers with agitators, the installation position of the radar level gauge should not be near the agitator, because irregular vortices will be generated during stirring, which will cause the attenuation of the radar signal. （ √ ）
61. [True or False] When wiring the line in the explosion hazard area, it must be wired in the explosion-proof junction box used in the design document to stipulate that the "safety production simulation test is clear". The wiring must be firm and reliable, with good contact, and should be equipped with anti-loosening and anti-unplugging devices. （ √ ）
62. [True or False] The heat exchange method used in industry is very good, and it can be divided into three types: partition type, heat storage type, and direct hybrid type according to its working principle and equipment type. （ √ ）
63. [True or False] The project data of the unit during the construction period mainly comes from the construction unit. （ × ）
64. [True or False] The basic measurement principle of the spring tube pressure gauge is that after the spring tube is connected to the measured pressure, a small displacement is generated at the free end, and then the displacement of the free end is converted into the moving position of the pointer through the transmission amplification mechanism. （ √ ）
65. [True or False] The handheld communicator can deal with problems in configuration, communication, transmitter or process. （ × ）
66. [True or False] The database server is used for data storage and network publishing (WEB) functions. （ √ ）
67. [True or False] The intelligent valve positioner is not an intelligent field instrument. （ × ）
68. [True or False] There are two pressure gauges A and B, the calibration scale of the A gauge is 500KPa, and the calibration scale of the B gauge is 800KPa, and the absolute error of them is 5KPa, so it can be said that the measurement accuracy of the two pressure gauges is equal. （ × ）
69. [True or False] This safety instrument and equipment can be divided into Exia and E according to the different safety degree and place of use. The safety production mock test is a one-point pass. xib。 The explosion-proof level of Exia is higher than that of Exib. （ √ ）
70. [True or False] Intrinsically safe instrumentation equipment can be divided into Exir and Exib according to the degree of safety and the place of use. Exir has a higher explosion protection rating than Exib. ()（ √ ）
71. [True or False] If a technician mistakenly orders the pneumatic reaction actuator as the 'latest analysis' of the positive acting actuator, the easiest way to deal with it is to reconfigure the valve positioner mechanism assembly. （ √ ）
72. [True or False] According to the basic principle of measuring the flow rate of the target flowmeter, it can be known that the target flowmeter is a resistance instrument. （ √ ）
73. [True or False] The measurement part of the elliptical gear flowmeter is composed of two interconnected elliptical gears, shafts and housings. A measuring chamber is formed between the gear and the housing. （ × ）
74. [True or False] When the air source pressure of the instrument is interrupted or the air supply system fails, the pneumatic position valve can automatically cut off the channel between the output of the positioner and the air chamber of the control valve to ensure that the process parameters in the adjustment circuit remain unchanged, and the position holding valve will return to normal immediately after the fault is eliminated. （ √ ）
75. [True or False] The larger the effective area of the pneumatic membrane actuator, the smaller the thrust. （ × ）
76. [True or False] Temperature cannot be measured directly, but can only be measured indirectly by the physical quantities of other objects that change with temperature. （ √ ）
77. [True or False] Gray poison filter canisters are used to protect against aromatic hydrocarbon toxic gases. （ × ）
78. [True or False] The main component of the fuse is the melt. For circuits with stable operating currents (e.g., lighting circuits), the rated current of the melt should be slightly less than the operating current of the load. （ × ）
79. [True or False] Due to the different cross-sectional sizes of the flow beam contraction before and after the throttling device, the flow velocity and static pressure are also different. On the inlet side of the throttling device, the flow beam cross-section is large, the flow velocity is small, and the static pressure is small; On the outlet side of the throttling device, the cross-section of the flow beam is small, the flow velocity is large, and the static pressure is large. （ × ）
80. [True or False] Electric actuators are generally divided into three types: linear stroke, angular stroke, and multi-rotation type. （ √ ）
81. [True or False] The electrical valve positioner is divided into intrinsically safe type and flameproof type. （ × ）
82. [True or False] The electric "safety production simulation test" air valve positioner is divided into intrinsically safe type and flameproof type. （ × ）
83. [True or False] The straight-through double-seat control valve has one spool and two seats. （ × ）
84. [True or False] The compact pneumatic film actuator has the characteristics of high reliability, small appearance and light weight (√)
85. [True or False] The fault detection element in the interlock protection system must be set separately, preferably a direct detection switch installed in the field. （ √ ）
86. [True or False] The compensation wire is common for all kinds of thermocouples. （ × ）
87. [True or False] The installation sequence of the module of Siemens S7-300PLC system on the guide rail is as follows: (1) power module (PS); (2) CPU module; (3) Interface module (IM optional); (4) Signal module (SM); (5) (6) Communication Processor (CP); Functional Modules (FM). ()（ × ）
88. [True or False] When the angle control valve is used for side inlet and bottom out, it is easy to oscillate. （ × ）
89. [True or False] The more the packing of the control valve, the better. （ × ）
90. [True or False] The material selected for the packing of the control valve must have the ability to resist temperature changes, and have the ability to resist creep, relaxation and oxidation. （ √ ）
91. [True or False] The hydrodynamic noise of the control valve is caused by the liquid flowing through the throttle hole of the control valve. （ √ ）
92. [True or False] The ideal adjustable ratio of the control valve depends on the shape of the valve core, and the actual adjustable ratio depends on the shape of the valve core and the state of piping. （ √ ）
93. [True or False] There are strict requirements for straight pipe sections when installing mass flow meters. （ × ）
94. [True or False] The diameter of the ultrasonic flowmeter can measure the pipe from a few centimeters to several meters, and the pipe can be round or rectangular. （ √ ）
95. [True or False] The ultrasonic level gauge has no moving parts, although the ultrasonic probe has vibration, the amplitude is very small, and the instrument structure is simple. （ √ ）
96. [True or False] Because the ultrasonic level gauge cannot withstand too high temperature, it cannot measure the level of high-temperature medium. （ √ ）
97. [True or False] In order to facilitate batch production, the rotameter manufacturer calibrates the instrument with water or air and gives a curve according to the actual situation of the user. （ × ）
98. [True or False] Through the calculation of the relevant parameters of the rotameter, it can be seen that when the taper of the cone tube of the rotameter increases, and the other conditions remain unchanged, the range of the instrument increases after conversion. （ √ ）
99. [True or False] The basic operation methods of logical operations include commutative law, associative law, and distributive law. （ √ ）
100. [True or False] The distributed control system decentralizes the control function to the field equipment to realize the dispersion of dangerous functions. （ × ）
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