Cold Rolling Worker Examination Papers with Answers
Cold mill test papers and answers
Total score: 100 questions: 50 questions
1. Single choice (20 questions, 40 points)
1. The west section of the acid rolling line of the cold rolling plant consists of a () and 5-stage ladder flow rinsing tank between the last pickling tank and the rinsing section
A. Reserve for rinsing
B. Pre-rinsing unit
C. Rinse tank
D. Rinsing tank
Correct answer: B Steel rolling home ID: zhagangzhijia
Analysis of this question: There is no analysis
2. The main reasons that can cause underpickling are ()
A. Low acid temperature or low acid concentration
B. The process speed is 40m/min for a long time
C. The process speed is 150m/min for a long time
D. not put into the scale breaker
Correct answer: A Steel rolling home ID: zhagangzhijia
Analysis of this question: There is no analysis
3. The severity of parking spots depends on ()
A. Strip running speed
B. Length of parking time
C. Temperature and concentration of pickling solution
D. Strip thickness
Correct answer: B Steel rolling home ID: zhagangzhijia
Analysis of this question: There is no analysis
4. Cold rolled oxide pressing is ()
A. Caused by pressing the oxide sheet into the strip surface during hot rolling
B. Produced when casting steel and formed by hot rolling
C. Produced on the pickling unit
D. Produced at the pickling inlet
Correct answer: A Steel rolling home ID: zhagangzhijia
Analysis of this question: There is no analysis
5. Tell the turbulent pickling technology that only the () of the strip can affect the dynamic energy and turbulence of the acid
A. Thickness
B. Weight
C. Length
D. Speed
Correct answer: D Steel rolling home ID: zhagangzhijia
Analysis: There is no analysis of steel rolling home ID: zhagangzhijia
6. The metal stays in the acid solution for too long, so that under the action of the acid solution, the surface gradually becomes rough and pockmarked.
A. Underpickling
B. Over pickling
C. The cutting edge is not clean
D. Scratches
Correct answer: B Steel rolling home ID: zhagangzhijia
Analysis of this question: There is no analysis
7. () is not the process characteristics of cold rolling
A. Cold rolling does not have the problems of temperature drop and uneven temperature, so it can produce very thin coils
B. Low processing temperature, in rolling will produce different degrees of work hardening.
C. Process cooling and lubrication should be used in cold rolling.
D. Tension rolling should be used in cold rolling
Correct answer: A Steel rolling home ID: zhagangzhijia
Analysis of this question: There is no analysis
8. Under normal circumstances, the structure composition of the oxide sheet on the surface of hot rolled strip steel is () from inside to outside.
A.eo, Fe3O4, Fe2O3
B.Fe3O4, Fe2O3, FeO
C.Fe3O4, FeO, Fe2O3
D.Fe2O3, Fe3O4, FeO
Correct answer: A
Analysis of this question: There is no analysis
9. The pickling tank and the tank are separated by () roller
A. Tension roller
B. Squeeze dry roll
C. Pull straightening roller
D. Steering roller
Correct answer: B Steel rolling home ID: zhagangzhijia
Analysis of this question: There is no analysis
10. Chemical reaction between acid and oxide sheet includes ()
A. Dissolution, stripping and oxidation
B. Stripping and oxidation
C. Dissolution, stripping and reduction
D. Dissolution and reduction
Correct answer: C Steel rolling home ID: zhagangzhijia
Analysis of this question: There is no analysis
11. In general, 2080 strip mill in 2080 refers to ()
A. The rack spacing is 2080mm
B. Length of roll is 2080mm
C. Roll bearing seat center distance 2080mm
D. Roll body length is 2080mm
Correct answer: A Steel rolling home ID: zhagangzhijia
Analysis of this question: There is no analysis
12. According to the chemical composition of steel, steel can be divided into ()
A. Structural steel, tool steel, special steel
B. Carbon steel, alloy steel
C. Killed steel, boiling steel, semi-killed steel
D. eutectoid steel, hypoeutectoid steel, hypereutectoid steel, Letenite steel
Correct answer: B Steel rolling home ID: zhagangzhijia
Analysis of this question: There is no analysis
13. The relation between plasticity and softness of metal is ()
A. There is no necessary connection between the plasticity of A metal and its softness
B. Increased plasticity increased flexibility
C. Plasticity decreased flexibility increased
Correct answer: A Steel rolling home ID: zhagangzhijia
Analysis of this question: There is no analysis
14. Basic principles of continuous rolling ()
A. The second traffic is equal
B. The crown of the board is consistent
C. Consistent tension
D. Consistent reduction rate
Correct answer: A
Analysis of this question: There is no analysis
15. Within the heating range, with the deformation speed (), the deformation resistance has a significant increase
A. Improve
B. Reduce
C. No change
Correct answer: A
Analysis of this question: There is no analysis
16. After cold working of metals, work hardening () is a characteristic of work hardening.
A. The lattice arrangement is regular
B. The plasticity of the metal is increased
C. The strength and hardness of metals are increased
Correct answer: C
Analysis of this question: There is no analysis
17. The following pre-rolling defects have no effect on the quality of finished products after rolling ()
A. Slight pickling
B. Slight underpickling
C. Slight edge burrs
D. Slight cracking
Correct answer: A
Analysis of this question: There is no analysis
18. The following defect is not a plate defect ()
A. Medium waves
B. Bilateral waves
C. Underpickling
D. Warping
Correct answer: C
Analysis of this question: There is no analysis
19. Show the second flow thickness control is ()
A.AMF
B.MFC
C.FFC
Correct answer: A
Analysis of this question: There is no analysis
20. Periodic dents on the steel surface are caused by ()
A. Roll defects
B. Defect of guide and guard
C. Heating defects
Correct answer: A
Analysis of this question: There is no analysis
2. Judgment Questions (total 30 questions, total 60 points)
21. The main function of corrosion inhibitors is to avoid over-pickling
Answer: Correct
22. Iron oxide is hard, brittle and almost non-malleable
Answer: Correct
23. At present, various countries in the world have adopted a variety of methods to remove the oxidized iron and steel surface, and our factory uses a mechanical method
Answer: Correct
24. After pickling the strip can exist slightly over pickling
Answer: Correct
25. There can be a negative difference in strip width after cold rolling
Answer: Wrong
26. For low carbon steel, rolling below 500 degrees Celsius is definitely cold rolling
Answer: Wrong
27. In order to achieve the elongation set by the tension straightening machine, the tension, the insertion amount of the tension straightening roller and the number of input groups must all reach the set value
Answer: Correct
28. The width after cutting edge must be equal to the width of the finished product after rolling
Answer: Wrong
29. The role of carbon dioxide gas used in the welding machine is to protect the hot metal from oxidation during high temperature welding
Answer: Correct
30. The higher the coiling temperature of the hot rolled plate, the easier it is to pickling, and the better the pickling effect
Answer: Wrong
31. The higher the yield strength of the hot rolled plate, the more obvious the tensile correction effect
Answer: Wrong
32. The width of the cut edge of the disc must be equal to the width of the finished product after rolling
Answer: Wrong
33. Cracks, surface non-metallic inclusions and scarring can all be caused by defects in raw materials
Answer: Correct
34. The higher the coiling temperature of the strip, the finer the grain size of the strip, and thus the better its mechanical properties.
Answer: Wrong
35. For the same steel coil in the raw material, the hardness difference should be less than 10%
Answer: Correct
36. The cycle of steel coil weighing is about 15s
Answer: Correct
37. The uncoiler does not provide back tension during uncoiling
Answer: Wrong
38. There are 12 pairs of extruding rollers, including 5 pairs of pickling section and 7 pairs of rinsing section.
Answer: Correct
39. The function of the stretch straightening machine is to pre-break the scale of the strip and improve the plate shape of the strip
Answer: Correct
40. The six elements contained in carbon steel are iron, carbon, silicon, manganese, sulfur and phosphorus
Answer: Correct
41. Whether it is hot rolling or cold rolling, the reduction procedure is the most basic core content of the rolling system
Answer: Correct
42. In the process of continuous rolling, the tension can be used to effectively improve the shape of the plate and significantly reduce the rolling pressure
Answer: Correct
43. Product technical standards can be divided into national standards, industry standards and enterprise standards according to their authority and scope of use
Answer: Correct
44. Before cold rolling, slight pickling of the strip before rolling has no effect on the quality of the finished product after rolling.
Answer: Correct
45. The role of the pickling outlet slotting machine is mainly to slotting the edge of the strip when the width of the strip changes
Answer: Correct
46. The best pickling temperature is 100℃
Answer: Wrong
47. The role of emulsion in cold rolling is to cool, clean and lubricate
Answer: Correct
48. Scales in steel can cause cracking of steel during hot processing, that is, the so-called hot brittleness
Answer: Wrong
49. The higher the concentration of the emulsion, the lower the rolling force, so the higher the concentration of the emulsion, the better
Answer: Wrong
50. In normal operation, of the two rollers in a set of tension rollers, the linear speed of the latter is less than the previous one.
Answer: Correct
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