Question Bank Source: Production Safety Simulation Examination Yitong Official Account Mini Program
2022 Refrigeration and Air Conditioning Equipment Operation Operation Test Questions are secret papers before the test! The 2022 Refrigeration and Air Conditioning Equipment Operation Examination Questions and Online Simulation Examination will be based on the Refrigeration and Air Conditioning Equipment Operation Examination Outline. Refrigeration and air conditioning equipment operation test simulation questions are available at any time according to the production safety test simulation test.
1. [Single choice question] R134a refrigeration compressor should use the following ( ) lubricating oil. (C)
A, mineral oil
B, alkylbenzene
C, polyester oil (POE)
2, [Single choice question] Generally, the temperature range of mercury thermometer is (). (B)
A, 0℃ to 100℃
B, -30℃ to 300℃
C, 100℃ to 300℃
3, [Single choice question] The following does not meet the requirements for correctly establishing a view of professional honors (). (C)
A. The motivation for fighting for professional honors should be pure
B. The means of obtaining professional honors should be correct
C. Socialist market economy is competition. Therefore, competition for professional honors should be taken as the subject
4. [Single choice question] What is not a chemical explosion accident is the explosion that occurs ( ). (C)
A, ammonia encounters open flame
B,
C when welding refrigeration system,
C when using inert gas pressure test
5, [Single choice question] The refrigerant with the worst soluble in lubricating oil is (). (A)
A, R717
B, R22
C, R134a
6, [Single choice question] Refrigeration devices using ammonia refrigerant must be carried out regularly ( ). (A)
A, release air
B, release moisture
C, release nitrogen
7, [Single choice question] There are excellent requirements for frozen oil and refrigerant (). (B)
A, repulsive
B, mutually soluble
C, discrete
8, [Single choice question] When cooling water cools the refrigerant in condenser , the condensation pressure will (). (C)
A, reduce
B, increase
C, unchanged
9, [Single choice question] In the refrigeration cycle, the suction pressure refers to ( ) import. (C)
A, evaporator
B, condenser
C, compressor
10, [Single choice question] The pressure protective relay of the refrigeration and air conditioning equipment cuts off the power of motor , and must ( ) reset before restarting the motor. (C)
A, indirect
B, automatic
C, manual
11, [Single choice question] If labor is in one of the following () situations, the employer can terminate the labor contract. (C)
A,
A,
B, who suffers from occupational diseases or work-related injuries and is confirmed to have lost or partially lost the ability to work,
C in the prescribed medical period ,
12, which is proven to not meet the employment conditions during the probation period, [Single choice question] Chemical frostbite is generally divided into three degrees, and the chemical frostbite level that damages the entire layer of skin is ( ) degrees. (C)
A, 1
B, 2
C, 3
13, [Single choice question] Horizontal evaporator and dry evaporator are both evaporators of the following ( ) types. (C)
A, plate
B, spiral plate
C, shell and tube
14, [Single choice question] The reason for frosting of the compressor suction tube is (). (C)
A, compressor oil return poor
B, oil incondensable gas in the system
C, expansion valve improper adjustment
15, [Single choice question] The longest noise-absorbing method used for compressed gas dynamic noise, rotation noise and motor noise is ().(A)
A, muffler
B, filter
C, expansion valve
16, [Single choice question] In the double-barrel single-effect lithium bromide absorption chiller, the one with a higher working pressure arranged in the cylinder above is (). (B)
A, absorber and evaporator
B, generator and condenser
C, absorber and condenser
17, [Single choice question] In the double-tube single-effect lithium bromide absorption chiller, the one with a lower working pressure arranged in the cylinder below is (). (A)
A, absorber and evaporator
B, generator and condenser
C, absorber and condenser
18, [Single choice question] In an absorption refrigeration unit, if the cooling water flows in series, the equipment that is usually passed first is (). (B)
A, condenser
B, absorber
C, evaporator
19, [Single choice question] In the refrigeration system, the container used to store liquid refrigerant is called (). (C)
A, evaporator
B, condenser
C, liquid reservoir
20, [Single choice question] The main purpose of safety production management is (). (A)
A. Timely discover safety hazards, correct and rectify them in time to prevent accidents
B. Timely discover safety hazards, correct and rectify them in time, and deal with accidents
C in time, and achieve " four not letting " to prevent similar accidents from happening again
21. [Single choice question] For refrigeration equipment without insulation layer and the outer wall of the pipeline, paint of different colors should be painted according to the specifications, such as the color of the suction pipe and return pipe is (). (C)
A, silver gray
B, light yellow
C, sky blue
22, [Single choice question] The special operation qualification certificate for special operations personnel shall be stipulated in a unified style by the construction department of () for (). (A)
A, State Council
B, provincial
C, municipal
D, county
23, [Single choice question] The test sequence for the trial operation of centrifugal refrigeration units is (). (A)
A, airtightness test , drying treatment, vacuum test, adding lubricant, refrigerant
B, vacuum test, adding lubricant, airtightness test, drying treatment, refrigerant
C, airtightness test, vacuum test, drying treatment, refrigerant, lubricant
24, [Single choice question] When the process temperature is lower than ( )℃, sodium chloride solution can be used as refrigerant . (A)
A, 0
B, 1
C, 3
25, [Single choice question] Personnel who must be strictly evaluated and hold a qualification certificate shall not include (). (C)
A, the main person in charge of the enterprise
B, the security management personnel
C, the team leader
26, [Single choice question] A certain air conditioning project uses Japanese-made chiller unit . The product sample shows that its cooling capacity is 2,000 cold tons, and the cooling capacity should be ( ). (A)
A, 7722kW
B, 7.34kW
C, 24000kcal/s
27, [Single choice question] According to the concept of safe production and work requirements, for production and operation units, the first object to protect safe production is (). (B)
A, equipment
B, practitioner
C, production safety management
28, [Single choice question] Ammonia refrigerant is flammable and will burn when exposed to an open flame. The natural temperature of ammonia is generally ( )℃. (B)
A, 500
B, 630
C, 1000
29. [Single choice question] When the ammonia refrigeration pipeline system is installed, the pores that need to be reserved when the high-pressure exhaust pipe from the compressor to the outdoor condenser passes through the wall is ().(C)
A, 0mm to 5mm
B, 5mm to 10mm
C, 10mm to 20mm
30, [Single choice question] The installation requirements for float level controller in the ammonia refrigeration system are (). (B)
A,
B must be installed horizontally,
C must be installed vertically,
C can be installed according to actual conditions,
31, [Single choice question] The trial operation of the ammonia refrigeration system, the cumulative operation time of each compressor shall not be less than ( )h. (C)
A, 12
B, 24
C, 48
32, [Single choice question] When welding pipelines in ammonia refrigeration system, the number of repair welding times of the weld shall not exceed ( ) times. (B)
A, 1
B, 2
C, 3
33, [Single choice question] When an ammonia pressure gauge is installed on equipment and pipelines with large pressure fluctuations, its pressure guide tube ( ). (A)
A. Smoke absorption measures must be taken
B. Smoke absorption measures do not need to be taken
C. Determine whether shock absorption measures are needed depending on the on-site situation
34. [Single choice question] In an ammonia absorption refrigeration system, the pressure in the absorber is compared with the pressure in the evaporator (). (A)
A, low pressure in the absorber
B, low pressure in the evaporator
C, similar
35, [Single choice question] Water-flow condensers are generally used in ( ) devices. (A)
A, ammonia refrigeration
B, freon refrigeration
C, lithium bromide refrigeration
36, [Single choice question] Requirements when opening the steam heating valve when the lithium bromide absorption refrigerator is turned on (). (B)
A, quickly turn on
B, slowly turn on
C, turn on
37 at the same time as the pump, [Single choice question] In the lithium bromide absorption refrigeration unit, install temperature controller on the outlet pipe of the high-pressure generator concentrated solution to prevent the solution from overtemperature, and its temperature is usually set at (). (B)
A, 180℃-185℃
B, 160℃-170℃
C, 165℃-175℃
38, [Single choice question] There is also a lithium bromide solution in the cooling water of the lithium bromide absorption refrigeration unit. The possible reason is (). (B)
A, the liquid level in the generator is too low
B, the liquid level in the generator is too high
C, the cooling water temperature is too low
39, [Single choice question] Lithium bromide absorption refrigerator must be shut down for a long time ( ). (B)
A, oxygen protection
B, nitrogen mount protection
C, vacuum mount
40, [Single choice question] thermal expansion valve is a valve member that automatically adjusts the supply of liquid to the evaporator, and it is mainly suitable for ( ) refrigeration system. (B)
A, ammonia
B, freon
C, lithium bromide
41, [Single choice question] Since the double-stage compression divides the compression process into two times, the compression ratio and exhaust temperature of each compression are reduced accordingly, and refrigeration coefficient ( ). (A)
A, increase
B, reduce
C, unchanged
42, [Single choice question] Most of the screw compressor currently used in refrigeration systems are (). (A)
A, single-stage open
B, semi-closed
C, fully enclosed
43, [Single choice question] The advantages of direct-ignition lithium bromide absorption hot and cold water unit do not include (). (C)
A. It can be used for cooling in summer, and it can be used for heating in winter. It can provide sanitary hot water
C. The economy of the device greatly improves
44. [Single choice question] The factor that determines the compressor exhaust volume is ().(C)
A, suction temperature
B, exhaust temperature
C, gas transmission coefficient
45, [Single choice question] centrifugal compressor and axial flow 'safe production simulation test 'one-pass' compressor both belong to ( ) compressors. (C)
A, volumetric
B, scroll
C, speed
46, [Single choice question] The characteristics of professional discipline are incorrectly expressed (). (C)
A. Professional disciplines in various industries have their basic requirements for consistency.
B. Professional disciplines in various industries have their special characteristics.
C. Professional disciplines do not require self-constraint. [Single choice question] The refrigerant gas evaporated from the evaporator is sucked in by a single-stage impeller. Through the parts such as impeller , diffuser , volute , and volute , is the compressor that is sent to the condenser after the refrigerant pressure is raised. (A)
A, centrifugal
B, screw
C, piston
48, [Single choice question] The evaporator tube group is immersed in a refrigerant water tank, the refrigerant evaporates in the tube, and the refrigerant flows in the box under the action of the stirrer to enhance heat transfer is ( ) evaporator. (A)
A, spiral plate
B, plate
C, water tank type (immersive)
49, [Single choice question] The measures to prevent the absorber and condenser nozzles of lithium bromide absorption machine sets are (). (A)
A, put the unit in an oxygen isolation state
B, regularly replace the solution
C, expand the nozzle aperture
50, [Judgement Question] Operations at a height of more than 30 meters are first-level high-level operations. (×)
51. [Judgement Question] " Safety Production Law " stipulates that during the operation process, practitioners should strictly abide by the safety production rules and regulations of their unit, obey management, and wear and use labor protective supplies correctly. (√)
52. [Multiple choice question] In order to ensure the normal operation of the compressor, its suction temperature needs to be lower than the evaporation temperature. (×)
53. [Judgement Question] In order to ensure that freon refrigerant is in a dry state and prevent ice plug accidents, refrigerant must be filled with drying filter . (√)
54. [Judgement Question] acetylene bottle should be placed horizontally when used or stored. (×)
55. [Judgement Question] Practitioners can obstruct and interfere with the investigation and handling of production safety accidents in accordance with the law according to the requirements of the unit. (×)
56. [Judgement Question] During the operation process, practitioners should strictly abide by the unit's safety production rules and regulations and operating procedures, obey management, and correctly wear and use labor protection supplies. (√)
57. [Multiple choice question] The development of good professional ethics of practitioners not only requires external norms and constraints, but also requires internal moral consciousness and self-cultivation. (√)
58. [Multiple choice question] The "four diligences" in daily maintenance and safety of refrigeration and air conditioning equipment refer to frequent looking at instruments, frequent touching the temperature of the equipment, frequent listening to the sound of the equipment operation, and frequent understanding of the requirements of the use department. (√)
59. [Multiple choice question] The oil separator in the refrigeration system is a safety device to prevent moisture from mixing into the lubricating oil. (×)
60. [Multiple choice question] Even if the absolute pressure of of the working fluid is not changed, the gauge pressure and vacuum degree may still change. (√)
61. [Multiple choice question] The reading on the pressure gauge is the actual pressure of the working fluid. (×)
62. [Multiple choice question] The saturation pressure of the same liquid is different at different temperatures. The lower the temperature, the higher the saturation pressure. (×)
63. [Multiple choice question] The current standard implemented by domestic refrigeration engine oil is the industry standard, namely the SHO349-92 industry standard. The industry standard is divided into six viscosity levels: 12, 22, 32, 46, 68 and 88 according to the kinetic viscosity at 40°C.(×)
64. [Multiple choice question] In cold storage, safe production simulation test, install an operational alarm system in case of accidents. (√)
65. [Multiple choice question] In actual applications, the pressure loss of evaporator is small, and an internal balanced thermal expansion valve is generally used. When the pressure loss is large, an external balanced thermal expansion valve should be used. (√)
66. [Multiple choice question] Welding can also be performed when the pipeline is filled with Freon refrigerant. (×)
67. [Multiple choice question] During pressure test and leak detection, if the system is found to have leaks, repair welding should be carried out immediately. (×)
68. [Multiple choice question] During the test run, the unit should have an independent power supply system , and the voltage requirements are stable. The equipment is grounded reliably to ensure personal safety. (√)
69. [Judgement Question] Security Technical Briefing In addition to oral briefing, there must also be written briefing records. (√)
70. [Multiple choice question] For piston compressor , if there is an oil-viewing mirror on the cover plate on the crankcase, the reasonable amount of oil loading of the crankcase should be the center line of the oil-viewing mirror. (√)
71. [Multiple choice question] Demolition work must be carried out from top to bottom layer by layer. It is strictly forbidden to work at the top and bottom simultaneously. (√)
72. [Multiple choice question] The simplest circuit consists of power supply, load, switch and connecting wire. (√)
73. [Multiple choice question] Most Freon refrigerants are slightly toxic. (√)
74. [Judgement Question] When an ammonia refrigeration system finds leakage during the vacuum extraction stage, timely re-welding should be carried out and a vacuum test should be performed. (×)
75. [Multiple choice question] When welding pipelines in ammonia refrigeration system, small welds must be welded in one go, and some relatively large welds can be welded in several times according to actual conditions. (×)
76. [Multiple choice question] When welding pipelines in ammonia refrigeration system, based on the basic principle of saving, welds can be carried out under the actual situation when there is pressure in the pipeline. (×)
77. [Judgement Question] The computer room of ammonia absorption cooling must have good ventilation conditions. (√)
78. [Multiple choice question] Ammonia is a gas that is flammable but not toxic. (×)
79. [Judgement Question] When the ammonia system is tested for pressure, there is no need to isolate the ammonia pump, float valve, , float liquid level controller, etc. (×)
80. [Judgement Question] The effectiveness of the law is higher than that of laws and regulations. (√)
81. [Multiple choice question] First-order reciprocating safety production simulation exam of piston compressors. The penetration force can be balanced by adding balance weight. (×)
82. [Multiple choice question] In the event of strong winds of level 4 (including level 4) or above, earth backfilling , transport, and other constructions that may cause dust pollution shall not be carried out. () ( √ )
83. [Multiple choice question] The work of a piston compressor is completed by the continuous change of the working volume composed of the cylinder, gas valve and piston that reciprocates in the cylinder. (√)
84. [Multiple choice question] Mixed refrigerants can be divided into azeotropic refrigerants and non-zeotropic refrigerants. (√)
85. [Judgement Question] The higher the temperature of lithium bromide aqueous solution, the stronger its ability to absorb water vapor. (×)
86. [Multiple choice question] When the substance is cooled or heated, its state only changes (such as liquid varies gaseous state), and the temperature does not change. The substance will also absorb or release heat during this process. (√)
87. [Multiple choice question] When a production and operation unit enters an labor contract with an (including employment contract ), it shall truthfully inform the practitioner of the possible occupational hazards and consequences during the work process, occupational hazard protection measures and treatment, and state in the labor contract that it shall not conceal or defraud.(√)
88. [Multiple choice question] When employees of production and operation units return to work within two years after leaving their post, they do not need to receive safety training at the workshop (section, district, team) and team level. (×)
89. [Multiple choice question] Due to busy tasks, employers can arrange for workers to engage in homework that is exposed to occupational disease hazards first, and then conduct occupational health checks before taking up work after free. (×)
90. [Multiple choice question] Most of the screw compressors currently used in refrigeration systems are oil injection compressors. (√)
91. [Multiple choice question] centrifugal refrigeration compressor The most commonly used driver variable speed motor. (×)
92. [Multiple choice question] The most commonly used drive machine for centrifugal refrigeration compressors is a variable speed motor. (×)
93. [Multiple choice question] The theoretical energy of a centrifugal refrigeration compressor is related to the compressor structure, rotation speed, condensation temperature, evaporation temperature and volume flow of steam suction in the impeller. (√)
94. [Multiple choice question] Graduates from vocational colleges can be exempted from training when they engage in homework related to their major. (×)
95. [Multiple choice question] The base of the screw refrigeration compressor has little vibration, so the basics can be made smaller. (√)
96. [Judgement Question] Leakage in the screw compressor has no effect on volume efficiency. (√)
97. [Judgement Question] Automatic energy adjustment of screw compressors is achieved through four-way solenoid valve. (√)
98. [Multiple choice question] If you violate the law, you must violate professional ethics. (√)
99. [Multiple choice question] Refrigerant is a working medium that circulates and transfers cold volume in various refrigeration systems. It is abbreviated as media, also known as working fluid . (×)
100. [Judgement Question] When fire welding is required to repair the leakage points of the system, the welding safety operating procedures should be strictly observed. Fire prevention measures should be taken on site, and the system should be released before welding can be carried out. (√)
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