Source of the question bank: Safety production simulation exam one-point public number mini program
Safety production simulation exam one-point pass: refrigeration and air conditioning equipment operation registration exam must be practiced before the exam! Safety Production Mock Exam One Point Pass Update Refrigeration and Air Conditioning Equipment Operation Exam Content Questions and Answers every month! Do it a few more times, in fact, through the refrigeration and air conditioning equipment operation of the operation of the online exam is very simple.
1. [Multiple choice question] The pressure measured by the pressure gauge is ( ) pressure. （ B ）
A. Absolutely
B. Relative
C. Saturation
2. [Single choice question] In the refrigeration system, the equipment for producing the cooling amount and the output cooling amount is ( ). （ C ）
A. Compressor
B. Condenser
C. Evaporator
3. [Single choice] The oil separator is used to separate the lubricating oil entrained in the refrigerant after compression to prevent it from entering the ( ) equipment and worsening the heat transfer conditions. （ B ）
A. Evaporator
C. Filter
4. [Single choice question] The internal inspection safety status level of the pressure vessel is 3 to 4 levels, and the annual inspection interval is ( ) years. （ B ）
A、1
B、3
C、6
5. [Single choice] The allowable dimensional deviation of the insulation layer of the insulation layer of the ammonia refrigeration system is ( ) mm. （ B ）
A、±2
B、±5
C、±10
6. [Single choice] In the case of centrifugal freezer, due to the low speed of sound of halogenated hydrocarbon refrigerant, and the supersonic flow of refrigerant gas in the impeller will produce a shock wave, and the fluid speed must be ( ). （ C ）
A. Rise
B. Unchanged
C. Decrease
7. [Single choice question] The installation requirements of the temperature controller in the ammonia refrigeration system are ( ). （ B ）
A. Horizontal installation
B. Vertical installation
C. Determined according to the scene situation
8. [Single choice question] The production score (degassing range) of lithium bromide absorption unit is generally ( ). （ B ）
A、3%-4.5%
B、3.5%-5.5%
C、5%-6.5%
9, [single choice] In the lithium bromide absorption refrigerator, water is the refrigerant, lithium bromide is ( ). （ C ）
A. Desiccant
B. Coolant
C. Absorbent
10. [Single Choice Question] When dealing with ammonia leakage accident in the ammonia cooler, the items that the emergency repairer must wear do not include (). （ C ）
A. Gas masks
B. Anti-ammonia suit
C. Rubber insulated boots
11. [Single choice question] The following statement about refrigerant is incorrect ( ). （ B ）
A. Water should not be used in refrigeration machines with working temperatures below 0 °C, and is only suitable for lithium bromide absorption and steam jet refrigeration
B, ammonia has no corrosion to steel, and when it contains moisture in time, it will not corrode zinc, copper and other copper alloys
C, R134a does not destroy the ozone layer, but its breakdown voltage is small, and the compressor coil and insulation material should strengthen the insulation
12. [Single choice] Before starting the Freon compressor, the purpose of heating the lubricating oil is ( ). （ B ）
A. Increase the temperature of the lubricating oil
B. Let the Freon dissolved in the lubricating oil escape
C. Reduce the viscosity of lubricating oil
13. [Single choice] In the absorption refrigeration unit, in order to separate the substance with low boiling point from the vaporization in the solution, it is necessary to heat the working medium solution, and the equipment where the solution is heated is ( ). （ A ）
A. Generator
B. Absorber
C. High temperature heat exchanger
14. [Single Choice Question] The basic requirement of socialist morality is ( ). （ C ）
A. Social morality, professional ethics, family virtues
Patriotism, collectivism and socialism
C. Love the motherland, love the people, love labor, love science, love socialism
15. [Single choice question] According to the different arrangement of heat transfer tubes, it is divided into water-shower condenser and spiral tubular water-type condenser, which is assembled by a spiral tube bent from a seamless steel pipe, which is called ( ) condenser. （ B ）
A. Water type
B. Spiral tube water-dripping type
C. Horizontal pipe water type
16. [Single choice question] The reason why the electronic temperature-controlled refrigerator does not defrost may be ( ). （ B ）
A. The temperature of the freezer is too low
B. Defrost heating circuit failure
C. The temperature of the cold room is too high
17. [Single choice question] The evaporation temperature of the single-stage vapor compression refrigeration cycle can only reach ( ). （ B ）
A、-35℃--45℃
B、-25℃--35℃
C、-15℃--25℃
18. [Single choice question] When a fire occurs, the smoke alarm system should act immediately, and the operator should immediately ( ). （ B ）
A. Open the smoke outlet
B. Open the fume extractor or smoke extraction valve
C. Turn on the smoke extractor
19. [Single Choice Question] The volume occupied by a substance with a unit mass is called ( ). （ A ）
A. Specific capacity
B. Density
C. Specific heat
20. [Single choice question] According to the concept of safe production and work requirements, for production and business units, the first object that safety production needs to be protected is ( ). （ A ）
A. Practitioners
B. Equipment
C. Safety production management personnel
21. [Single choice question] The pressure test time of the ammonia refrigeration system is generally ( ) h. （ A ）
A、12
B、24
C、48
22. [Single choice question] Temporary lighting of maintenance equipment should be used ( ). （ A ）
A. Strong flashlight
B. Movable chandelier
C. Lighter
23. [Single choice] When the ammonia refrigeration pipeline system is installed, when the high-pressure exhaust pipe from the compressor to the outdoor condenser passes through the wall, the porosity that needs to be reserved is ( ). （ C ）
A、0mm至5mm
W、5mm至10mm
C、10mm至20mm
24. [Single choice question] The destructive effect caused by the gas compression explosion is mainly manifested as the shock wave formed in the air. （ A ）
A. Explosion
B. Compression
C. Expansion
25. [Single choice] The heat exchange device that must be possessed in the lithium bromide absorption refrigeration system is ( ). （ A ）
A. Generator, condenser, evaporator, absorber
B. Condenser, evaporator, high temperature heat exchanger, absorber
C, condenser, evaporator, condensate reheater, absorber
26, [single choice] steam type lithium bromide absorption refrigeration unit, in the steam pipeline system, when the working steam contains moisture, its dryness is lower than ( ), to install a moisture separator to ensure the heat transfer efficiency of the high-pressure generator. （ C ）
A、0.90
B、0.95
C、0.99
27, [single choice] The evaporation pressure of the refrigerant is best not lower than the atmospheric pressure, so as to avoid the appearance of the refrigeration system ( ). （ B ）
A. Positive pressure
B. Negative pressure
C. Vacuum
28. [Single choice question] The measures to prevent the blockage of the absorber and condenser nozzle of the lithium bromide absorption unit are ( ). （ A ）
A. Make the unit in a state of oxygen isolation
B. Replace the solution regularly
C. Expand the nozzle aperture
29. [Single choice question] In order to prevent a series of unfavorable situations caused by excessive exhaust temperature in the piston compressor, it should be installed at the outlet of the compressor ( ). （ B ）
A. Suction temperature controller
B. Exhaust gas temperature controller
C. Economy
30. [Multiple Choice Question] What is not a chemical explosion accident is an explosion that occurred in ( ). （ C ）
A. Ammonia meets an open flame
B. When welding the refrigeration system
C. When using inert gas for pressure testing
31. [Single choice question] When the bottle valve of the refrigerant freezes, the cylinder should be moved to a place with a higher temperature ( ) The refrigerant cylinder should be heated with an open flame. （ B ）
A. At the same time
B. Prohibited
C. Appropriate
32. [Single choice question] When welding the pipe of the ammonia refrigeration system, the number of welds for welding shall not exceed ( ) times. （ B ）
B、2
C、3
33. [Single choice] When the centrifugal compressor starts, if the temperature of the temperature regulator is set to the required temperature immediately, the motor will be overloaded or the condensation pressure will be too high, and ( ). （ A ）
A. Wheezing
B. Liquid strike
C. Overload
34. [Single choice question] If the pressure exceeds the pressure that can be endured by the refrigeration equipment, pipelines, refrigerant storage devices, etc., an accident will occur . （ C ）
A. Corrosion
B. Physics
C. Explosion
35. [Single choice question] In order to improve the heat exchange effect of bromine cooler heat exchange equipment, the surfactant often added in lithium bromide solution is ( ). （ C ）
A, lithium chromate
B. Hydrobromic acid
C, octanol
36. [Single choice] The material usually used in the rotor of a screw compressor is ( ). （ B ）
A. Carbon steel
B. Ductile iron
C. Gray cast iron
37. [Single choice question] When the centrifugal refrigeration unit is first filled with refrigerant, the general filling amount is ( according to the rated charge). （ A ）
A、50%-60%
B、20%-50%
C、70%-90%
38. [Judgment question] Observation on the color of refrigerant water in lithium bromide absorption unit: If the refrigerant water is yellow, it means that the refrigerant water has been contaminated. （ √ ）
39. [Judgment question] When an electrical fire occurs at the construction site, the power supply should be cut off first, and the foam fire extinguisher should be used to extinguish the fire. （ × ）
40. [Judgment question] The electrical system of the chiller mainly includes two parts: the power system and the control system. （ √ ）
41. [Judgment question] At present, the small Freon screw compressor applied to the refrigeration system adopts a single-stage opening type. （ × ）
42. [Judgment question] The relative temperature of civil air conditioning indoors is 40% to 60% in summer. （ √ ）
43. [Judgment Question] The coordination of holes and shafts of mechanical drawings must be marked with tolerances, while other fittings do not need to be marked with tolerances. （ × ）
44. [Judgment Question] Temporary electricity projects must be jointly accepted by the preparation, review, approval department and the user unit, and can only be put into use after passing. （ √ ）
45. [Judgment Question] Reading the "Operation Manual" of the chiller in detail is an important source for understanding the various parameters of the chiller. （ √ ）
46. [Judgment question] When the centrifugal chiller is running empty, first jog the main motor, observe the correct steering and then start the main motor. （ √ ）
47. [Judgment question] The water system of the chiller mainly includes two parts: the cooling water system and the chilled water system. （ √ ）
48. [Judgment question] The electronic halogen leak detector generally consists of three parts: sensor, measurement line and gas path. （ √ ）
49. [Judgment question] The reason why the piston refrigeration system causes the compressor hydraulic shock is that the evaporation temperature is too high. （ × ）
50. [Judgment question] When the fault inspection of the chiller is carried out, it is generally carried out in accordance with the four major parts of the electrical system, the water system, the oil system and the refrigeration system. （ √ ）
51, [Judgment Question] R134a is a refrigerant without chlorine elements, which has no destructive effect on the atmospheric ozone layer, but it is a greenhouse gas, and once it is discharged into the atmosphere, it will enhance the greenhouse effect. （ √ ）
52. [Judgment question] Refrigerant is a working medium for circulating and transmitting cold quantity in various refrigeration systems, referred to as medium, also known as working medium. （ × ）
53. [Judgment question] The structure of the gas-liquid heat exchanger usually adopts the shell-coil type, as well as the winding pipe type, casing type and other structures. （ √ ）
54. [Judgment question] Before the piston refrigeration compressor starts, the energy adjustment handle should be dialed to the maximum load. （ × ）
55. [Judgment question] The condenser of the chiller needs to be cleaned regularly. （ √ ）
56, [judgment question] screw refrigeration compressor or refrigeration unit in the manufacturing has been strict pressure leak detection and vacuum leak detection, but after transportation and on-site hoisting, may affect the sealing of the machine, so after the end of the machine installation, it is also necessary to carry out pressure re-test. （ √ ）
57. [Judgment question] The principle of adjusting the energy of the spool valve is to use the axial movement of the sliding screw to change the effective axial working length of the screw, so that the energy is continuously and steplessly adjusted between 100% and 10%. （ √ ）
58. [Judgment Question] Employees may obstruct and interfere with the investigation and handling of production safety accidents in accordance with the law in accordance with the requirements of the unit. （ × ）
59. [Judgment question] In order to ensure the normal operation of the compressor, its suction temperature needs to be lower than the evaporation temperature. （ × ）
60. [Judgment question] When installing refrigeration equipment, the shorter the joint takeover, the better. （ √ ）
61. [Judgment question] The cold insulation project of the ammonia refrigeration system should be carried out after the air tightness test of the refrigeration equipment and pipelines and the ammonia filling test of the refrigeration system are qualified. （ √ ）
62. [Judgment question] The safety valve, bypass valve and pressure gauge used in the ammonia refrigeration system must be verified and sealed by the relevant measurement department before installation. （ √ ）
63. [Judgment question] The refrigeration system of the refrigeration cabin on the ship and the refrigeration system of the food cold storage are often designed as parallel systems for emergency use. （ √ ）
64. [Judgment Question] The production and operation unit shall truthfully inform the employees of the risk factors, preventive measures and emergency measures for accidents in the workplace and the workplace. （ √ ）
65, [judgment question] The capillary of the air conditioner will be blocked, which will increase the exhaust pressure of the compressor and increase the operating current. （ × ）
66. [Judgment question] The evaporation pipe of the Freon refrigeration process, the group ends the connection, and the drainage pipe is blown no less than twice with compressed air of 1.6MPa. （ × ）
67. [Judgment question] All the high-pressure condensate that passes through the throttling mechanism is reduced into the low-pressure condensate required for the evaporator. （ × ）
68. [Judgment Question] For the unmanned equipment room, the management personnel do not need to check the operation of the equipment regularly. （ × ）
69. [Judgment question] The higher the temperature of the aqueous lithium bromide solution, the stronger its ability to absorb water vapor. （ × ）
70. [Judgment question] Thermoexptension valve is a Freon refrigeration device that adjusts the liquid refrigeration capacity into the evaporator according to the change of the evaporator load, and at the same time reduces the liquid from the condensation pressure to the evaporation pressure. （ × ）
71. [Judgment question] Most of the absorbers and condensers of lithium bromide absorption units adopt spray forest structures. Practice has proved that the high content of chlorine and sodium in the solution will cause the nozzle with a small pore size to block. （ × ）
72. [Judgment question] The actual working process of piston compressor includes three processes: suction, compression and exhaust. （ × ）
73. [Judgment question] After the liquid ammonia splashes on the human skin, it must be rinsed quickly with water. （ √ ）
74. [Judgment question] Centrifugal refrigeration compressor with a certain structure can only adapt to one refrigerant. （ √ ）
75. [Judgment question] The aqueous solution of ammonia is acidic due to the formation of ammonium hydroxide. （ × ）
76. [Judgment question] Rotary vane mechanical vacuum pump is suitable for vacuuming the refrigeration system in the range of 10 °C ~ 40 °C and the inlet pressure is less than 1330Pa. （ √ ）
77. [Judgment Question] There is no necessary connection between social morality, professional ethics and family virtue. （ × ）
78. [Judgment question] When it is found that the heat exchanger and the pressure vessel have local deformation and bulge, in order to safely operate the equipment, it should be replaced immediately. （ √ ）
79. [Judgment Question] Professional ethics is a professional code of conduct that practitioners follow in line with the characteristics of the profession, and the professional quality cultivated into goodness through learning and practice covers the relationship between practitioners and service recipients, occupations and employees, and occupations and occupations. （ √ ）
80, [judgment question] refrigeration system in order to be beautiful, the elbow of the pipe can be made into any angle. （ × ）
81. [Judgment Question] In line with the principle of "prevention first", the refrigeration machine room must be equipped with fire extinguishing equipment such as carbon dioxide or dry powder to prepare for extinguishing oil fires, electric fires, etc. （ √ ）
82. [Judgment question] In the process of being cooled or heated, the substance only changes in state (such as liquid gaseous state), and the temperature does not change, and the material will also absorb or release heat in this process. （ √ ）
83, [judgment question] The disadvantage of the manual energy regulation control system of the screw refrigeration compressor is that it requires the operator to strictly control it, the labor intensity of the workers increases, and the energy increase or decrease is difficult to ensure that it is timely and accurate. （ √ ）
84. [Judgment question] At present, the screw compressors applied to the refrigeration system are mostly fuel-injected compressors. （ √ ）
85. [Judgment question] In lithium bromide absorption refrigeration, the refrigerant water pump, the generator pump and the absorber pump all use shielded pumps. （ √ ）
86. [Judgment question] Patients who inhale ammonia should immediately move to a well-ventilated area to rest and pay attention to keeping warm. （ √ ）
87. [Judgment question] For low-temperature equipment installed in a normal temperature environment, hard paddies should be added under the base, and the mats should be treated with anti-corrosion in advance. （ √ ）
88. [Judgment question] The vacuum of the ammonia refrigeration system can be completed before the pressure test and leak detection. （ × ）
89, [judgment question] when the liquid refrigerant enters the compressor is compressed, its pressure rises sharply instantaneously, far exceeding the normal operation of the gas pressure impact exhaust valve plate, it is easy to break the valve plate to damage the compressor, so the compressor should especially prevent "liquid impact". （ √ ）
90. [Judgment Question] The legitimate rights and interests of persons with mental disorders shall be protected by law. （ √ ）
91. [Judgment Question] The demolition operation must be carried out from top to bottom layer by layer, and it is strictly forbidden to work at the same time. （ √ ）
92. [Judgment Question] In order not to let idle people enter the workshop, the unit can block the exit of the workshop. （ × ）
93. [Judgment Question] Operations at heights above 30 meters are first-level operations at heights. （ × ）
94. [Judgment question] Reciprocating compressors are easier to achieve higher final pressure than screw compressors. （ √ ）
95. [Judgment question] The content volume ratio of screw compressor after factory delivery is fixed. （ √ ）
96. [Judgment Question] In the process of operation, employees shall strictly abide by the safety production rules and regulations and operating procedures of the unit, obey the management, and correctly wear and use labor protective equipment. （ √ ）
97. [Judgment Question] The ladder is not allowed to be long, but it can be used as a height. （ × ）
98. [Judgment Question] Learning professional ethics is conducive to the development of enterprises and the construction of work style. （ √ ）
99. [Judgment Question] In order to ensure that the Freon refrigerant is in a dry state and prevent the occurrence of ice plug accidents, the refrigerant needs to go through the filter drier. （ √ ）
100, [Judgment question] Lithium bromide absorption unit long-term shutdown before starting again to start the extraction device to remove the nitrogen in the unit, after the solution and refrigerant water are added to the unit, but also to carry out pumping operation. （ √ ）
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