Question bank source: Safety production mock test, one-stop public account applet
2024 [Welder (Elementary)] Exam Question Bank and Welder (Elementary) Exam Questions and Analysis, including Welder (Elementary) Exam Question Bank Answers and Analysis and Welder (Elementary) Exam Questions and Analytical Exercises. The safety production mock test is combined with the latest syllabus of the national welder (primary) exam and the summary of the real questions of the welder (primary) exam, which is helpful for the practice before the welder (primary) certificate exam.
1. [Multiple Choice] () The force on both sides is basically equal or unequal, and the asymmetry of the force direction is used as the support point at the turning point of the line. （ C ）
A. Tension bar
B. Branch rod
C. Corner rod
D, T adaptor
2. [Multiple Choice] () can obtain the real shape of the object, and the drawing method is relatively simple, which has become the basic principle and method of mechanical drawing. （ C ）
A. Center projection method
B. Vertical projection method
C. Orthographic projection method
D. Three-view method
3. [Multiple Choice] The Law of the People's Republic of China on the Protection of Consumer Rights and Interests was implemented in (). （ D ）
A、1991
B、1992
C、1993
D、1994
4. [Multiple choice] The following () do not belong to low-temperature steel. （ D ）
A、16Mn
B、09Mn2V
C、16MnCu
D、15Cr1MoV
5. [Multiple choice] The following () is not an index of plasticity. （ D ）
A. Elongation
B. Cold bending angle
C. Section shrinkage
D. Impact toughness
6. [Multiple Choice] The following () is the element symbol of oxygen. （ A ）
A、O
B、N
C、C
D、H
7. [Multiple choice question] The following statements about innovation are incorrect (). （ A ）
A. Innovation is irrelevant to personal development
B. Innovation is a huge driving force for the sustainable and healthy development of enterprises and undertakings
C. Innovation is an important means for enterprises to win in competition
D. Innovation is an important factor for the success of one's career
8. [Multiple choice question] Among the following welding inspection methods, which belong to non-destructive testing, is (). （ D ）
A. Hardness test
B. Impact test
C. Fatigue test
D. Radiographic flaw detection
9. [Multiple choice question] Among the following test methods for resistance welding, which is a destructive test, is (). （ D ）
A. Visual inspection
B. Tightness inspection
C. Radiographic inspection
D. Metallographic inspection
10. [Multiple Choice] The following statements are incorrect. （ D ）
A. Before cutting, the surface of the weldment should be cleaned of oil, rust and other dirt
B. When starting to cut, preheat the edge of the steel plate first, wait for the edge to appear red, move the flame out of the edge line, and open the cutting oxygen valve at the same time
C. When gas cutting, hold the torch handle with the right hand, and control the cutting door of the preheated oxygen with the thumb and index finger of the left hand, which is convenient for adjusting the preheating flame and cutting off the preheated oxygen in time when the tempering is tempered
D. When tempering, the acetylene valve must be closed immediately, and the acetylene must be cut off in time to prevent the acetylene from backflowing into the acetylene tube
11. [Multiple choice question] The angular deformation deviation value of the following diameter pipes is not allowed to exceed 1/100 () when welding. （ C ）
A、90mm
B、120mm
C、150mm
D、200mm
12. [Multiple choice] The joint with the opposite parallel end faces of the two weldments is called (). （ A ）
A. Butt joint
B. Corner joints
C. Termination joints
D. Lap joints
13. [Multiple choice question] The Contract Law of the People's Republic of China was promulgated in (). （ D ）
A、1994
B、1996
C、1998
D、1999
14. [Multiple choice] In order to reduce the () between the weldment and the electrode, the surface of the weldment and the electrode must be carefully cleaned before welding. （ C ）
A. Contact voltage
B. Contact current
C. Contact resistance
D. Contact capacitance
15. [Multiple choice question] The "1" in the flux-cored wire E601T1-B3 of low-alloy steel indicates (). （ D ）
A. Classification code of chemical composition of welding wire
B. Flux-cored wire
C. Types of welding power supply
D. It is used for all-position welding
16. [Multiple choice question] The main function of protective grounding is () and reduce the current flowing through the human body. （ C ）
A. Prevent personal electric shock
B. Reduce the grounding current
C. Reduce the grounding voltage
D. Short circuit protection
17. [Multiple choice] The input voltage of the single-phase full-wave rectifier circuit is 6V, and its output voltage is (). （ D ）
A、6V
B、2.7V
C、3V
D、5.4V
18. [Multiple Choice] With the increase of atomic number, the atomic radius of the elements of the same main group gradually increases, the metallicity gradually increases, and the non-metallic (). （ A ）
A、逐渐减弱
B. Gradual enhancement
C. No change
D. Unsure
19. [Multiple Choice] In X-ray flaw detection, tungsten is presented on the film (). （ B ）
A. Oval black dots
B. Irregular white and bright blocks
C. Dots or strips
D. Regular black linear
20. [Multiple Choice] In the single-tube transistor amplification circuit, the circuit with a small voltage amplification factor is (). （ C ）
A. Common collector circuit
B. Common emitter circuit
C. Common base circuit
D. Voltage-dividing bias circuit
21. [Multiple choice] The first "1" in the flux grade SJ101 indicates (). （ B ）
A. Melting flux
B. The slag slag type is fluorine-alkali type
C. Code of deposited metal type
D. Sintered flux
22. [Multiple Choice] Before scribing, the surface of cast iron and forging blank should be coated (). （ A ）
A. Lime water
B. Copper sulfate solution
C. Blue oil
D. Sodium carbonate solution
23. [Multiple Choice] In the iron-carbon equilibrium state diagram, the structure of mild steel at room temperature is (). （ A ）
A. Pearlite + ferrite
B. Pearlite + austenite
C. Ferrite + austenite
D. Pearlite + martensitic
24. [Multiple Choice] The key to achieving melting welding is to use a local heating heat source with concentrated energy ( C )
A. The temperature is high
B. Better
C. The temperature is high enough
D. Movement
25. [Multiple choice question] For the electrical appliances in the low-voltage power grid where the power supply does not have a grounding centerline, the shell of the electrical appliances shall be grounded with a conductor wire to protect personal safety, which is called (). （ D ）
A. Anti-electric shock device
B. Lightning protection
C. Protective device
D. Protective grounding
26. [Multiple Choice] It is known that the secondary voltage of the power transformer is 20 volts, and now the single-phase bridge rectifier circuit is used, and the voltage can be obtained on the load. （ C ）
A、10
B、9
C、18
D、20
27. [Multiple choice] An atom (or cluster of atoms) with an electric charge is called (). （ B ）
A. Molecule
B. Ions
C. Electronics
D. Protons
28. [Multiple choice question] The welding method code of hand arc welding in the commonly used welding method is (). （ A ）
A、111
B、1
C、12
D、22
29. [Multiple choice question] According to the role of high-voltage electrical appliances in the power system, the following electrical appliances () belong to current-limiting electrical appliances. （ D ）
A. Circuit breaker
B. Fuse
C. Transformer
D. Reactor
30. [Multiple choice question] The diameter selection of gas welding wire is mainly based on (D)
A. Welding position
B. Left welding method and right welding method
C. The inclination angle of the welding nozzle
D. Thickness of the workpiece
31. [Multiple choice question] When the flame correction method corrects the welding deformation, the minimum heating temperature shall not be lower than (). （ A ）
A、300°C
B、200°C
C、400°C
D、350℃
32. [Multiple choice question] The focus of personal protective measures for welding operations is to do a good job in the ventilation and dust removal of the welding operation site and to do a good job in the welder's (). （ D ）
A. Operational technology
B. Skills learning
C. Personal hygiene
D. Personal protection
33. [Multiple choice question] Welding process evaluation refers to the evaluation of the results of the () and "safe production simulation test" carried out to verify the correctness of the proposed welding process. （ A ）
A. Test process
B. Comprehensive discussion
C. Computer simulation
D. Comprehensive assessment
34. [Multiple choice] Welded joints are the most basic elements of (). （ A ）
A. Welded structure
B. Welding
C. Welding production
D. Products
35. [Multiple Choice] The working fluid for the water wall outlet tube of the natural circulation boiler to enter the steam drum is (). （ C ）
A. Saturated steam
B. Saturated water
C. Soda mixture
D. Superheated steam
36. [Multiple Choice] The greater the rigidity of the welded structure, the greater the thickness of the plate, and the welding deformation caused by it (). （ B ）
A. The bigger
B. The smaller
C. No change
D. Unsure
37. [Multiple Choice] The () coated coating used in electrode arc welding is called electrode. （ B ）
A. Electrode
B. Melt the electrode
C. Conductive rod
D. Conductor
38. [Multiple Choice] The farther the weld deviates from the neutral axis of the structure, the easier it is to produce (). （ A ）
A. Bending and deformation
B. Wave deformation
C. Angular deformation
D. Distortion and deformation
39. [Multiple choice question] The welding core is made of 1Cr18Ni9 material, the diameter of the electrode is 4mm, and the length of the electrode should be within the range of (). （ D ）
A、150mm～250mm
B、350mm～450mm
C、250mm～350mm
D、350mm～400mm
40. [Multiple Choice] The lighting circuit is composed of a watt-hour meter, a main switch, a fuse, a bulb and a wire. （ A ）
A. Switch
B. Socket
C. Electric motor
D. Contactor
41. [Multiple Choice] MIG/MAG welding, the length of the welding wire is related to the wire material, welding voltage, wire diameter and (). （ D ）
A. Transitional form
B. Nozzle aperture
C. Gas flow
D. Welding current
42. [Multiple choice question] Voltage relays can be divided into () categories according to the actual use requirements. （ B ）
A、2
B、3
C、4
D、5
43. [Multiple choice] The potential difference between any two points in the electric field is called (). （ D ）
A. Current
B. Inductance
C. Resistance
D. Voltage
44. [Multiple Choice] The area where the arc is close to the positive electrode is the anode area, and the anode area is wider than the cathode area, but only (). （ C ）
A、10-1~10-2
B、10-2~10-3
C、10-3~10-4
D、10-4~10-5
45. [Multiple choice question] arc stud welding is to ignite the arc between the stud to be welded and the workpiece, when the stud and the workpiece are heated to a suitable temperature, under the action of (), the stud is sent to the welding molten pool on the workpiece to form a welding joint. （ D ）
A. Temperature
B. Current
C. Voltage
D. Pressure
46. [Multiple choice question] The core of the electromagnetic system measuring instrument should be selected as a magnetic material of the () type. （ B ）
A. Soft magnetic
B, Hard Magnetic
C. Special purpose
D. Ferrite
47. [Multiple choice question] The width of the lap joint specimen in resistance welding is determined according to (). （ C ）
A. Test machine
B. Specimen length
C. Thickness of the sample
D. Welding conditions
48. [Multiple choice question] Resistance welding is classified into three basic methods: spot welding, seam welding and () according to the process method. （ A ）
A. Butt welding
B. Projection welding
C. Pressure welding
D. Roll welding
49. [Multiple Choice] At present, the electrode materials commonly used for tungsten argon arc welding are pure tungsten electrode, thorium tungsten electrode and (). （ D ）
A. Copper tungsten electrode
B. Hafnium tungsten electrode
C. Zirconium tungsten electrode
D. Cerium tungsten electrode
50. [Multiple Choice] The current regulation of the silicon arc welding rectifier power supply is regulated. （ B ）
A. Three-phase step-down transformer
B. Magnetic saturation reactor
C. Rectifier group
D. Output reactor
51. [Multiple choice question] There are more alkaline oxides in the coating of alkaline electrodes, so the ability of deoxygenation, desulfurization and dephosphorization (C)
A. It is not as good as acid electrode
B. Equivalent to acid electrode
C. Stronger than acid electrode
D. Second only to acid electrode
52. [Multiple choice] Carbon steel refers to an iron-carbon alloy with a mass fraction of carbon less than (). （ A ）
A、0.021099999999999997
B、0.0669
C、0.043
D、0.006
53. [Multiple choice question] The one with the largest coercivity and the largest magnetic energy product in magnetic materials is (). （ D ）
A. Silicon steel sheet
B. Iron-nickel alloy
C. Iron and aluminum alloy
D. Rare earth cobalt hard magnetic materials
54. [Multiple choice question] Professional ethics is the concrete embodiment of social moral requirements in () and professional relations. （ C ）
A. Production behavior
B. Economic behavior
C. Professional conduct
D. Social behavior
55. [Multiple choice question] Supplementary factors refer to the welding process factors that affect the welding joint (). （ C ）
A. Tensile strength
B. Bending performance
C. Impact toughness
D. Hardness
56. [Multiple Choice] Flow-carrying Line and Safety Production Simulation Test Try to determine the direction of the magnetic field generated by the coil, you can use the four fingers of the right hand to bend the current direction in the coil, and the thumb is erected, and the direction it points to is the direction of () in the current-carrying coil. （ B ）
A. The current is forced
B. Magnetic field
C. Magnetic flux
D. Induced current
57. [Multiple Choice] The performance of metals when acting on external forces is called (). （ C ）
A. Chemical properties
B. Physical properties
C. Mechanical properties
D. Welding performance
58. [Multiple choice question] The stud welding of steel adopts (). （ B ）
A. DC reverse connection
B. DC positive connection
C. Communication
D, Three-way equitable
59. [Multiple choice question] There are two preheating methods for flash butt welding: resistance preheating and (). （ C ）
A. Flame preheating
B. Infrared preheating
C. Flash preheating
D. High-frequency preheating
60. [True or False] () Generally, the resistance of insulating materials is above the megaohm, so the unit of the megohmmeter scale is expressed in kiloohms. （ × ）
61. [True or False] () When the three-phase load is connected in a triangle, and the current value of the three phases is equal, the three-phase load is a symmetrical load. （ × ）
62. [True or False] () From a macro point of view, matter is composed of different elements, safety production simulation exams, and elements. （ √ ）
63. [True or False] () Where the direction of the current changes and the magnitude does not change with time, it is called pulsating DC current. （ × ）
64. [True or False] () Labor law is an important and independent legal department in the entire legal system. （ √ ）
65. [True or False] () The shell of the light-emitting diode is transparent and fully plasticized, and the color of the shell indicates its luminous color. （ √ ）
66. [True or False] () The code of the surfacing electrode model is ED. （ √ ）
67. [True or False] () Normalizing refers to the heat treatment method of heating steel to 50~70 °C above A3 or Acm, keeping it warm, and cooling it in still air. （ √ ）
68. [True or False] () The spot welding process parameters do not include the thickness of the weldment, nor do they include the spot welding sequence. （ √ ）
69. [True or False] () The setting current of the thermal element of the thermal relay is generally adjusted to 0.95~1.05 times of the rated current of the motor. （ √ ）
70. [True or False] () Welding workers only need to do a good job of welding, and do not need to pay attention to other work. （ × ）
71. [True or False] () When welding, you should try not to use eccentric welding rods. （ √ ）
72. [True or False] () For MIG/MAG welding, when the welding current reaches or exceeds the critical value, the transition form of the molten droplet to the molten pool in the form of coarse particles larger than the diameter of the welding wire is called jet transition. （ × ）
73. [True or False] () MIG/MAG welding, the welding equipment does not need to ensure that the shielding gas flow is stable during the welding process. （ × ）
74. [True or False] () The fuse is mainly composed of three parts: copper wire, aluminum wire and tin sheet. （ × ）
75. [True or False] () The letter A in the category name of the power supply model indicates the arc welding engine. （ √ ）
76. [True or False] () When the DC voltmeter is used, the voltmeter is connected in parallel on the circuit under test, and the range of the voltmeter is determined by the voltage doubling resistance in series in the meter. （ √ ）
77. [True or False] () The selection of carbon steel welding rods should follow the principle of equal strength. （ √ ）
78. [True or False] () Professional ethics is an important part of the socialist moral system. （ √ ）
79. [True or False] () If the effective value of a voltage is 220 volts, the maximum value of this voltage is 380 volts. （ × ）
80. [True or False] () Quality management refers to the control of project quality. （ × ）
81. [True or False] () When selecting insulating materials, we should consider the magnitude of the current, the strength of the magnetic field, and the level of air pressure. The safety production mock exam is easy to understand. to think about it. （ × ）
82. [True or False] () Ethics and law are exactly the same, and they are both a kind of norm that restricts people's behavior of "one-point access to the safety production simulation test." （ × ）
83. [True or False] () There are many ways to hold the chisel, such as burring, side chisel cutting and using a shorter chisel. （ × ）
84. [True or False] () When the steel is put into storage, it can be placed at will for the convenience of placement. （ × ）
85. [True or False] () The element symbol of copper is Ca. （ × ）
86. [True or False] The "Special Equipment Safety Law of the People's Republic of China" stipulates that if special equipment fails or abnormalities occur, the special equipment user shall conduct a comprehensive inspection to eliminate the hidden dangers of accidents before continuing to use it. （ √ ）
87. [True or False] () The boiler pressure vessel pressure pipeline welder certificate (qualified project) is valid for 2 years. （ × ）
88. [True or False] The defects that M stands on the surface of the weld and can be seen with a microscope are called external defects. （ × ）
89. [True or False] After the multimeter is used, the transfer switch can be placed in any position. ()（ × ）
90. [True or False] When working in flammable and explosive places with electricity, as long as you pay attention to safety and prevent electric shock, there will generally be no danger ()( × )
91. [True or False] Adding potassium, sodium, calcium and other elements to the coating of the welding rod is conducive to the generation of arc and stable combustion. （ √ ）
92. [True or False] When the arc is stably combusted, the relationship between the welding current and the change of the arc voltage is called the volt-ampere characteristic of the welding arc when the electrode material, gas medium and arc length are constant. （ √ ）
93. [True or False] In the voltage regulator circuit of the silicon voltage regulator tube, the voltage regulator tube must be connected in series with the load. ()（ × ）
94. [True or False] When the weldment is connected to the negative pole of the power supply and the welding rod is connected to the positive pole of the power supply, the connection method is called the reverse connection method. （ √ ）
95. [True or False] One of the important contents of the welder's professional code is that in the production process, the welder's process documents should be strictly implemented to ensure product quality. （ √ ）
96. [True or False] The selection of the diameter of the electrode during welding depends on the thickness of the welded material, the welding position, the joint form and the number of weld bead layers. （ √ ）
97. [True or False] During the ignition process of the welding arc, a large amount of resistive heat is generated, which makes the heated cathode emit a large number of anions. （ × ）
98. [True or False] In a resistor series circuit, the larger the resistance, the greater the resistance divider ()( √ )
99. [True or False] The properties of steel depend not only on the chemical composition of the steel, but also on the structure of the steel. （ √ ）
100. [True or False] () The electrode is composed of two parts: the welding core and the coating. （ √ ）
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