2022 chemical automation control instrument examination summary and chemical automation control instrument simulation examination questions

Source of question bank ： Safety production simulation test, a little public official account.

Pass the safety production simulation exam at one point ：2022 The chemical automation control instrument examination in is summarized as a theoretical examination topic for students who are preparing for the chemical automation control instrument operation certificate , Chemical automation control instrument simulation test questions updated every month. I wish you a smooth passing of the chemical automation control instrument test .

1、【 Single topic selection 】 Radiant heat transfer () Any medium as a medium .（  A  ）

A、 Unwanted

B、 need

C、 Sometimes you need to

2、【 Single topic selection 】 The lubricating oil is filtered to remove ().（  B  ）

A、 Acidic impurities

B、 Mechanical impurities

C、 Alkaline impurities

3、【 Single topic selection 】CENTUMCS3000 Loop adjustment screen in the system ,I yes ().（  B  ）

A、 Proportionality

B、 Integral time

C、 Differential time

4、【 Single topic selection 】 Selection control is a kind of ().（  B  ）

A、 Servo control

B、 Soft limit safety control

C、 Interlock protection control

5、【 Single topic selection 】 In chemical plant , Relatively uncommon valves are ().（  A  ）

A、 Plug valve

B、 globe valve

C、 Gate valve

6、【 Single topic selection 】 In the split range control loop , The action of the split valve is in the same direction or different direction , Should be () It depends on your needs .（  B  ）

A、 controller

B、 Process practice

C、 control valve

7、【 Single topic selection 】 The control signal voltage of general solenoid valve in China is ().（  A  ）

A、220VA24VDC

B、220VAC12VDC

C、6VDC24VDC

8、【 Single topic selection 】 The relative flow of the regulated medium through the valve Q/Qmr× Relative travel ι/L The relationship between them is called the ().（  A  ）

A、 Flow characteristics

B、 Linear properties

C、 Displacement characteristics

9、【 Single topic selection 】 What cannot be used for scrubbing equipment is ().（  B  ）

A、 soap

B、 gasoline

C、 Washing powder

10、【 Single topic selection 】 The control valve is operated incorrectly ().（  C  ）

A、 Pneumatic control valve

B、 Manual regulating valve

C、 Remote control regulating valve

11、【 Single topic selection 】 The material of valve trim is subject to cavitation 、 When rinsing serious non corrosive fluid, choose ().（  A  ）

A、 Case hardened 1Cr18Ni9Ti

B、1Cr18Ni9Ti

C、 Nickel alloy 、 titanium alloy

12、【 Single topic selection 】 The unit of voltage is ().（  C  ）

A、 Watt (W)

B、 Joules (J)

C、 Volt (V)

13、【 Single topic selection 】CENTUMCS3001 In the system , At most, you can define () Domains .（  A  ）

A、16

B、8

C、64

14、【 Single topic selection 】 When plugging in and out various computer system cards , In order to prevent human static electricity from damaging the electrical components on the card , Should be ().（  C  ）

A、 Stand on the anti-static floor

B、 Plug and unplug the system after power failure

C、 Wear grounding ring or anti-static gloves

15、【 Single topic selection 】 Conduct ()( contain ) Work at heights above , We should handle “ Permit for work at heights ”.（  C  ）

A、10m

B、20m

C、15m

16、【 Single topic selection 】1 Kwh of electricity is available for “220V40W” When does the bulb normally light ().（  B  ）

A、20 Hours

B、25 Hours

C、40 Hours

17、【 Single topic selection 】MF4 The fire extinguishing reference area of portable dry powder fire extinguisher is ()㎡.（  A  ）

A、1.8

B、1.5

C、2.0

18、【 Single topic selection 】 The flow coefficient of engineering unit system is () Express . Defined as :5~400℃ Of water , The differential pressure at both ends of the valve is 1Kgf/c㎡, The number of cubic meters per hour flowing through the regulating valve when fully open .（  A  ）

A、C

B、Kv

C、Cv

19、【 Single topic selection 】MY5 Type portable 1211 The fire range of the fire extinguisher is ()m.（  B  ）

A、3

B、2

C、4.5

20、【 Single topic selection 】 The resistance of a metal conductor is related to its ().（  B  ）

A、 Inversely proportional to the length

B、 Inversely proportional to the cross-sectional area

C、 The voltage applied to both ends of the conductor is directly proportional to

21、【 Single topic selection 】 Before starting the ordinary centrifugal pump, fill the pump and exhaust , Mainly for ().（  B  ）

A、 The feed is stable

B、 Prevent the pump from binding

C、 Flush the pump body

22、【 Single topic selection 】 The replacement of lubricating oil for the pump shall be carried out in () Conduct .（  A  ）

A、 When the pump stops

B、 When the pump is running

C、 When the pump is running or stopped

23、【 Single topic selection 】 The tank car shall be checked before unloading acid (), To prevent acid leakage .（  B  ）

A、 pressure

B、 Hose

C、 temperature

24、【 Single topic selection 】 Zero differential pressure starting two position two-way solenoid valve is used () Recoil stop valve for operation .（  C  ）

A、 Diaphragm type

B、 Metal piston type

C、 Pilot type

25、【 Single topic selection 】 The interference channel should be as large as possible ().（  C  ）

A、 Amplification factor

B、 Differential time

C、 Time constant

26、【 Single topic selection 】 When the density of the medium that may cause explosion and combustion in the process pipeline is greater than that of air , Instrument pipelines shall be installed on the process pipe rack () Location .（  C  ）

A、 below

B、 parallel

C、 upper

27、【 Single topic selection 】 Distributed control system uses microcomputer technology to control the production process ().（  A  ）

A、 Decentralized control

B、 Computer control

C、 Distributed control

28、【 Single topic selection 】 Through the calculation of relevant parameters of rotameter , You can see : When the taper of the cone tube of the rotameter increases , When all other conditions remain unchanged , Then the range of the instrument after conversion ().（  A  ）

A、 increase

B、 Reduce

C、 unchanged

29、【 Single topic selection 】 The structure of straight through single seat valve is incorrect ().（  B  ）

A、 There are two types of valve core: front installation and reverse installation

B、 Positive action actuator must be used for pneumatic opening

C、 For nominal diameter DN＜25mm Single guide spool , It can only be installed in the front, not in the back

30、【 Single topic selection 】“m3;/h;L/h” These symbols are units of flow , They mean () The unit of flow .（  A  ）

A、 Volume

B、 quality

C、 Speed

31、【 Single topic selection 】() It refers to the failure or error of the functional module , The ability to continue to perform specific functions .（  A  ）

A、 Fault tolerance

B、 redundancy

C、 Fail safe

32、【 Single topic selection 】() yes DCS The core of , Closed loop control of production process , It can control several to dozens of circuits , You can also perform sequential 、 Logic and batch control .（  C  ）

A、 Operation station

B、 Process interface unit

C、 Process control unit

33、【 Single topic selection 】CENTUMCS3000R3 In the system , When the equipment information displayed on the system status screen is yellow , Indicates that the device ().（  B  ）

A、 There's a problem , But it works

B、 Standby state

C、 There's a problem , Can't work

34、【 Single topic selection 】 The daily safety education of workers should be based on “ Weekly safety activities ” For the main positions , And carry out () Safety education assessment .（  A  ）

A、 Once a month

B、 Once a season

C、 Every six months

35、【 Single topic selection 】 The cavitation of centrifugal pump is due to the transmission of liquid in () Caused by boiling and vaporization .（  A  ）

A、 Impeller inlet

B、 Inlet line

C、 High pressure area in the pump

36、【 Single topic selection 】 When there is a danger signal in the production unit , Be able to output the correct signal , Prevent danger from happening 、 Prevent the expansion of the accident or reduce the consequences of the accident , The system that works like this is called ().（  B  ）

A、 Computer control system

B、 Safety instrument system

C、 Distributed control system

37、【 Single topic selection 】 The selection of pneumatic control valve type includes ().（  A  ）

A、 Selection of actuator

B、 Selection of features

C、 Choice of action form

38、【 Single topic selection 】 The action forms of pneumatic actuator are ().（  A  ）

A、 Positive and negative effects

B、 Gas on and gas off

C、 Diaphragm and piston

39、【 Single topic selection 】 Before lubricating oil enters each lubricating point , Strictly follow () Principles .（  B  ）

A、 Five stage filtration

B、 Tertiary filtration

C、 Four stage filtration

40、【 Single topic selection 】MYT40 type 1211 The fire range of the fire extinguisher is ()m.（  A  ）

A、3-5

B、7-8

C、8-9

41、【 Single topic selection 】 The elastic element is directly felt in the elastic pressure gauge () Variable load cell .（  B  ）

A、 Force

B、 Measured pressure

C、 pressure

42、【 Single topic selection 】 Fuses are also called fuses . Under the normal working state of the circuit , The fuse is equivalent to ().（  A  ）

A、 A wire

B、 An electrical appliance

C、 A resistor

43、【 Single topic selection 】 The flow characteristic has a large flow when the opening is small , As the opening increases , The flow will soon reach its maximum , Then increase the opening , The flow changes very little , This feature is called ().（  C  ）

A、 Parabola characteristic

B、 linear

C、 Quick opening feature

44、【 Single topic selection 】 Set the sub controller first , The method of post tuning the main controller , It is the of parameter setting of cascade control loop controller ().（  A  ）

A、 Two step setting method

B、 One step setting method

C、 Three step setting method

45、【 Single topic selection 】 Relative flow of a regulating valve (Q/Qmax) Relative travel (l/L) It's logarithmic , Its characteristic is ().（  A  ）

A、 Equal percentage characteristic

B、 Quick opening feature

C、 linear

46、【 Single topic selection 】 For the control purpose of cascade uniform control system , Which of the following statements is true ().（  A  ）

A、 Main design of cascade uniform control system 、 The side variables are relatively stable , Change within the allowable range

B、 The cascade uniform control system only stabilizes the main variable , No requirements for side variables .

C、 The parameters of cascade uniform control system can be adjusted according to 4:1 Attenuation method setting

47、【 Single topic selection 】DCS in D The English word for is ().（  A  ）

A、Distributed

B、Digital

C、Diagnose

48、【 Single topic selection 】 Petrochemical Automation includes automatic monitoring 、 Chain protection 、 Automatic manipulation 、() Etc .（  C  ）

A、 Smart meters

B、 Safety instruments

C、 Auto-Control

49、【 Single topic selection 】 Conversion of flow units :3.6m3;/h=()L/S.（  C  ）

A、3.6

B、36

C、1

50、【 Single topic selection 】 Measure the liquid level of the open container , Then the range of the transmitter is the same as () of .（  C  ）

A、 Low level

B、 High level

C、 High liquid level 、 Low difference

51、【 Single topic selection 】 When measuring liquid level with float type liquid level gauge , The relationship between liquid level height and torque angle is ().（  B  ）

A、 When the liquid level is high , Large torque angle

B、 When the liquid level is high , Small torque angle

C、 When the liquid level is low , Small torque angle

52、【 Single topic selection 】 stay GB/T2624-93 The pressure tapping mode of the standard throttling device specified in is : Standard orifice plates can be used () Pressure tapping and flange pressure tapping .（  B  ）

A、 Ring room

B、 Corner joint

C、 Drill holes separately

53、【 Single topic selection 】 Absolute value of variation during calibration of differential pressure transmitter 、 The maximum... Should not be exceeded ().（  A  ）

A、 Allowable error value

B、 Relative error value

C、 Deviation value

54、【 Single topic selection 】 The fundamental difference between the block diagram of open-loop control system and closed-loop control system is whether there is ().（  A  ）

A、 Measuring element and transmitter

B、 Feedback signal

C、 The object of the charge

55、【 Single topic selection 】 Split range control loop , Just control the opening of the valve 、 The closing type can be divided into () class .（  B  ）

A、 One

B、 Two

C、 3、 ... and

56、【 Single topic selection 】SCADA Ethernet or wireless communication is adopted between the system dispatching center and the remote monitoring station CDMA、GPRS、3G Network communication , Its implementation should be based on the SCADA The size of the system , The general choice of network is , Dispatching center and station control system adopt () Means of communication .（  B  ）

A、GPRS

B、 Ethernet

C、3G Network communication

57、【 Single topic selection 】 The best position for installing the straight stroke regulating valve on the process pipeline is ().（  A  ）

A、 vertical

B、 level

C、 arbitrarily

58、【 Single topic selection 】 Small centrifugal pump delivers liquid at normal temperature , In normal operation , The bearing temperature of the pump shall be ()℃ following .（  A  ）

A、70

B、30

C、100

59、【 Judgment questions 】 Fieldbus only supports shielded twisted pair as its transmission medium .（  ×  ）

60、【 Judgment questions 】 The knife switch without arc extinguishing cover can be operated with load .（  ×  ）

61、【 Judgment questions 】PLC The system configuration 、 After configuration , Every input 、 The output channel corresponds to a unique input 、 Output address .（  √  ）

62、【 Judgment questions 】 The purpose of cascade control system is to stabilize the main variable with high precision , High requirements for main variables , Generally, no margin is allowed , Therefore, the main controller generally chooses PI The law of control ; When the object lag is large , Appropriate... Can also be introduced D effect .（  √  ）

63、【 Judgment questions 】 In the block diagram of the automatic control system , It can be considered that the comparator is one of them “ link ”.（  ×  ）

64、【 Judgment questions 】 The controlled object can be a complete device , It can also be a part of a device .（  √  ）

65、【 Judgment questions 】 Use the weight comparison method to calibrate the pressure gauge on the piston pressure gauge , It is often used to check the accuracy in 0.5 Various precision pressure gauges above grade .（  √  ）

66、【 Judgment questions 】 Convective drying is a process combining heat and mass transfer .（  √  ）

67、【 Judgment questions 】 Reducing the flow of centrifugal pump can alleviate the occurrence of cavitation .（  √  ）

68、【 Judgment questions 】 One of the basis for selecting the type of pressure gauge is the properties of the measured medium, i.e. physical and chemical properties . The temperature of the measured medium 、 Viscosity 、 Dirt level 、 corrosive 、 Crystals 、 flammability 、 Explosibility 、 oxidation - Reductive properties or special media .（  ×  ）

69、【 Judgment questions 】 One of the characteristics of intrinsically safe explosion-proof technology is that it can be maintained under live conditions 、 Calibrate and replace some parts of the instrument .（  √  ）

70、【 Judgment questions 】 The ratio of the diameter of the sealing stuffing box of the regulating valve to the diameter of the valve stem d0/d1 Direction affecting radial pressure .（  ×  ）

71、【 Judgment questions 】 The capacitive pressure transmitter is composed of a capacitor and an amplifier circuit .（  ×  ）

72、【 Judgment questions 】 Since the volume of liquid varies with temperature , Therefore, any liquid can be used as the filler of the liquid thermometer .（  ×  ）

73、【 Judgment questions 】 Thermal mass flowmeter can only be used in gas , The heat conduction and absorption capacity of various gases is the same as , Measure the heat transfer or heat loss from heating to induction to correspond to the flow rate .（  √  ）

74、【 Judgment questions 】 Intrinsically safe circuits and their accessories , There should be a blue sign .（  √  ）

75、【 Judgment questions 】 Angular displacement of output shaft of angular stroke electric actuator , The rotation angle is less than 360°, It is usually used to push the butterfly valve 、 globe valve 、 Eccentric rotary valve and other angle regulating mechanism , The normal angular displacement is 90° corner （  √  ）

76、【 Judgment questions 】 All closed vessels under pressure load can be called pressure vessels .（  √  ）

77、【 Judgment questions 】 One controller to operate several control valves , And operate different valves according to different sections of the output signal , This control mode is usually called split range control .（  √  ）

78、【 Judgment questions 】 When a steam heat exchanger works normally , The operating pressure is controlled at 800KPa, In actual operation, the maximum allowable is ±15KPa The measurement error of , Then the range and accuracy grade of the selected pressure gauge are 1.2MPa;1.0 level .（  √  ）

79、【 Judgment questions 】 There are two controllers in the cascade control system 、 Two measuring transmitters 、 Two actuators , Two objects .（  ×  ）

80、【 Judgment questions 】 When the pressure gauge is used to measure corrosive media , Neutral isolation device shall be installed .（  √  ）

81、【 Judgment questions 】 The outlet pressure of a compressor is 450KPa, In actual operation, the maximum allowable is ±12.6KPa The measurement error of , Then the range and accuracy grade of the selected pressure gauge are 675KPa;1.5 level .（  ×  ）

82、【 Judgment questions 】 For example, the programs in the main controller and the hot standby controller are different , Will affect redundant functions .（  √  ）

83、【 Judgment questions 】 The control purpose of the ratio system is to realize the proportional relationship of relevant materials .（  √  ）

84、【 Judgment questions 】 At Siemens PLC in ,I3.4 Is a representation of operations accessed by bits , The specific meaning is as follows :I: Area identifier , Indicates input ;3: Byte address ;.: Bytes and are separators between addresses ;4: Tag number (0~7)（  √  ）

85、【 Judgment questions 】 The more control valve packing is placed, the better .（  ×  ）

86、【 Judgment questions 】 The flow ratio of ratio control system refers to the main flow Q1 And auxiliary flow Q2 Flow ratio of .（  ×  ）

87、【 Judgment questions 】 The valve action can be reversed by using the valve positioner .（  √  ）

88、【 Judgment questions 】 The cascade control system can eliminate the influence of the nonlinear characteristics of the regulating valve .（  √  ）

89、【 Judgment questions 】 The target plate of the target flowmeter is inserted into the pipeline , When the fluid flows through , The static pressure difference is generated before and after the target plate , Its value is directly proportional to the fluid flow rate .（  ×  ）

90、【 Judgment questions 】 The electronic electric actuator is easy to adjust , Manual operation is simple and convenient , Easy to adjust 、 Convenient wiring 、 Servo amplifier integration , Additional installation of servo amplifier does not need to be considered .（  √  ）

91、【 Judgment questions 】 Mass flowmeter is a flowmeter based on measuring the mass of fluid .（  √  ）

92、【 Judgment questions 】 The capacitive level meter is composed of a capacitive level sensor and a circuit for detecting capacitance . It is suitable for all kinds of conductive materials 、 Measurement of liquid level or powder level of non-conductive liquid .（  √  ）

93、【 Judgment questions 】DCS long-range I/O The function of the unit can make I/O The control unit is placed on site away from the control room , The data is transmitted from the remote site to the main control room by means of communication transmission .（  √  ）

94、【 Judgment questions 】 The converter function of electromagnetic flowmeter is to amplify the weak induced potential and convert it into a unified standard signal output .（  √  ）

95、【 Judgment questions 】 The parameter setting of the controller of the uniform control system can be the same as that of the fixed value control system .（  ×  ）

96、【 Judgment questions 】 Degreasing shall be carried out in the outdoor ventilation place or in the room with ventilation device , Safety measures such as wearing protective articles shall be taken during work .（  √  ）

97、【 Judgment questions 】 Elliptical gear flowmeter is easy to install , A filter shall be installed at the inlet end during installation , Prevent solid impurities or foreign matters from entering the flowmeter .（  √  ）

98、【 Judgment questions 】 During patrol inspection of centrifugal pump , The oil level should be checked 、 Oil pressure 、 Seal water, cooling water and pump current 、 voice 、 Vibration, etc .（  √  ）

99、【 Judgment questions 】 The actuator is the driving device of the actuator , It generates the corresponding thrust according to the small pressure of the control signal , Push the control mechanism ( Adjusting mechanism ) action .（  √  ）

100、【 Judgment questions 】 The selection of pressure measuring instruments mainly includes : Selection of instrument type 、 Selection of instrument range and instrument attachment .（  ×  ）

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