2022 refrigeration and air conditioning equipment operation test paper and refrigeration and air conditioning equipment operation test skills

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

Pass the safety production simulation exam at one point ： Refrigeration and air conditioning equipment operation test paper must be practiced before the test ！ The skills and answers of the refrigeration and air conditioning equipment operation test are updated every month ！ Do it a few more times , In fact, it is very simple to pass the simulated test of refrigeration and air conditioning equipment operation .

1、【 Single topic selection 】 The oil separator is used to separate the lubricating oil entrained in the compressed refrigerant , To prevent it from entering ( ) In the device , Worsen heat transfer conditions .（  B  ）

A、 evaporator

B、 Condenser

C、 filter

2、【 Single topic selection 】R134a The refrigeration compressor shall adopt the following ( ) Lubricating oil .（  C  ）

A、 Mineral oil

B、 Alkylbenzene

C、 Polyester oil （POE）

3、【 Single topic selection 】R12 cryogen , Its evaporation temperature is -15℃ when , The corresponding saturation pressure is 1.863kg/cm², Keep the pressure constant , Make the temperature higher than -15℃, At this time, the refrigerant is in ( ) state .（  C  ）

A、 Saturated gas

B、 Supercooled liquid

C、 Superheated gas

4、【 Single topic selection 】 When vacuumizing with a compressor , First turn off the compressor ( ).（  C  ）

A、 Pressure valve

B、 Safety valve

C、 Exhaust valve

5、【 Single topic selection 】 Labor has the following () One of the situations , The employer may rescind the labor contract .（  C  ）

A、 Suffering from occupational disease or work-related injury and being confirmed to have lost or partially lost the ability to work

B、 Illness or injury , Within the prescribed medical period

C、 During the probation period, it is proved that it does not meet the conditions for employment

6、【 Single topic selection 】 The contents of professional behavior cultivation include ().（  C  ）

A、 Professional ethics criticism

B、 The meaning of professional ethics

C、 Professional ethics

7、【 Single topic selection 】R134r Refrigerant belongs to freon refrigerant () class .（  C  ）

A、CFC

B、HCFC

C、HFC

8、【 Single topic selection 】 The installation requirements of temperature controller in ammonia refrigeration system are ( ).（  B  ）

A、 Horizontal installation

B、 Vertical mounting

C、 It depends on the site conditions

9、【 Single topic selection 】 Influence of large diameter of suction pipe in freon refrigeration system , The following statement is correct ( ).（  B  ）

A、 It can increase the flow resistance ( Pressure drop )

B、 It can prevent the lubricating oil from returning to the compressor smoothly from the evaporator

C、 No influence

10、【 Single topic selection 】 In order to avoid “ Ice jam ” The phenomenon , Freon refrigeration system shall be equipped with ( ).（  C  ）

A、 Crystallizer

B、 Carburetor

C、 dryer

11、【 Single topic selection 】 Capacity fraction of lithium bromide absorption unit ( Bleeding range ) It's usually ( ).（  B  ）

A、3%-4.5%

B、3.5%-5.5%

C、5%-6.5%

12、【 Single topic selection 】 In the lithium bromide absorption refrigeration unit, in order to timely extract the air leaked into the system and the non condensable gas produced by corrosion in the system , Use the air extraction device to extract the non condensable gas from the upper part of the condenser and absorber solution , The right thing to do is ( ).（  B  ）

A、 Discharge the extracted non condensable gas directly

B、 The refrigerant vapor contained in the extracted non condensable gas is recovered by gas-water separator

C、 other

13、【 Single topic selection 】 For refrigeration equipment without insulation layer and outer wall of pipeline bottom , The paint shall be painted in different colors according to the specification , For example, the color of the condenser is ().（  B  ）

A、 Light yellow

B、 silver grey

C、 bright red

14、【 Single topic selection 】 Ammonia absorption refrigeration system , The evaporator is divided into two parts: low temperature and high temperature , The structure and area of these two parts are important for the reasonable distribution of cooling capacity between freezing chamber and refrigerating chamber ( ).（  B  ）

A、 No impact

B、 Great influence

C、 Depending on the structure of the freezer and freezer

15、【 Single topic selection 】 When the construction depth of foundation pit reaches ( )m To the extent of , It has posed a danger to the pit side operation , Edge protection facilities shall be set up according to the regulations of high-altitude operation and edge operation .（  C  ）

A、1.2

B、1.8

C、2

16、【 Single topic selection 】 When the lithium bromide absorption refrigeration unit is started and running , The liquid level of generator surface and absorber fluctuates , Sometimes there may be bubbles , The reason may be ().（  B  ）

A、 Voltage instability

B、 There is non condensable gas in the machine

C、 Compressor failure

17、【 Single topic selection 】 According to the different arrangement of heat transfer tubes, it is divided into drenching condenser and spiral tube drenching condenser , Among them, the one made of seamless steel pipe bent into spiral pipe is called () Condenser .（  B  ）

A、 Drenching type

B、 Spiral pipe water spraying type

C、 Horizontal pipe water spraying type

18、【 Single topic selection 】 The reason why tile floors are colder than wood floors is ( ).（  B  ）

A、 The temperature of ceramic tile floor is low

B、 Ceramic tile is a better heat conductor

C、 The surface of ceramic tile is smoother than that of wood

19、【 Single topic selection 】 What has nothing to do with the accidents of refrigeration and air conditioning is ( ).（  C  ）

A、 Pressure and temperature of refrigeration system

B、 irregularities

C、 ambient temperature

20、【 Single topic selection 】 Lithium bromide absorption refrigerator , When lithium bromide solution absorbs refrigerant water vapor in the absorber, it will ( ).（  B  ）

A、 Absorb heat

B、 Release heat

C、 Neither endothermic nor exothermic

21、【 Single topic selection 】 Before starting the Freon compressor , The purpose of heating the lubricating oil first is ( ).（  B  ）

A、 Raise the temperature of the lubricating oil

B、 Make the Freon dissolved in the lubricating oil escape

C、 Reduce the viscosity of lubricating oil

22、【 Single topic selection 】《 Safe production method 》 Regulations , be engaged in ( ) The operation personnel must be specially trained before taking the post .（  C  ）

A、 daily

B、 Ordinary

C、 Special type

23、【 Single topic selection 】 following ( ) yes 《 Mental health law 》 There is no requirement for the behavior of the employer .（  C  ）

A、 The employing unit shall, according to the actual situation of patients with mental disorders , Arrange patients to do what they can

B、 Arrange for patients to participate in necessary vocational skills training , Improve the employability of patients

C、 The patient's working environment does not need to be specialized

24、【 Single topic selection 】 The two-stage compression refrigeration system is used to ( ).（  A  ）

A、 Make a lower temperature

B、 Reduce compressor power consumption

C、 Improve the coefficient of refrigeration

25、【 Single topic selection 】 Common leak detection methods are soapy water 、 The instrument can also be used in addition to leak detection ( ).（  C  ）

A、 Oxygen leak detection

B、 High pressure liquid filling leak detection

C、 Vacuum leak detection

26、【 Single topic selection 】 The reason why the electronic temperature controlled refrigerator does not defrost may be ( ).（  B  ）

A、 The freezer temperature is too low

B、 Defrost heating circuit fault

C、 The temperature of the refrigerating room is too high

27、【 Single topic selection 】 Lithium bromide absorption unit , Check the vacuum pump oil. The contents to be checked do not include ( ).（  C  ）

A、 The brand of oil

B、 the oil level

C、 Oil packaging

28、【 Single topic selection 】 The advantages of direct fired lithium bromide absorption cold and hot water unit do not include ( ).（  C  ）

A、 Summer can be used to cool , It can be used for heating in winter

B、 Can provide sanitary hot water

C、 The economy of the device is greatly improved

29、【 Single topic selection 】 Of lithium bromide solution in lithium bromide absorption refrigerator unit PH The value should be adjusted to the normal range of ( ).（  B  ）

A、7.5 following

B、9.5-10.5

C、10.5 above

30、【 Single topic selection 】 In steam compression refrigeration , The refrigerant changes from gaseous state to liquid state in ( ) In the .（  A  ）

A、 Condenser

B、 compressor

C、 evaporator

31、【 Single topic selection 】 Variable frequency energy regulation , It refers to the method of changing the power supply frequency of the motor , Change the of the compressor ( ).（  A  ）

A、 speed

B、 voltage

C、 electric current

32、【 Single topic selection 】 The wind speed of split air conditioner can be adjusted normally according to needs under refrigeration and air supply modes , When switching to heating mode , The wind speed is always low , The reason may be ( ).（  B  ）

A、 The room temperature sensor is damaged

B、 The indoor pipe temperature sensor is damaged

C、 The outdoor defrosting temperature sensor is damaged

33、【 Single topic selection 】 Temporary lighting of maintenance equipment shall adopt ( ).（  A  ）

A、 LED flashlight

B、 Movable chandelier

C、 lighter

34、【 Single topic selection 】 For the refrigeration equipment without insulation layer and the outer wall of the pipe bottom , The paint shall be painted in different colors according to the specification , For example, the color of the drain pipe is ( ).（  B  ）

A、 silver grey

B、 Ochre yellow

C、 bright red

35、【 Single topic selection 】 Before vacuum leak test , The first leak test is ( ).（  A  ）

A、 pressure

B、 ammonia

C、 Freon

36、【 Single topic selection 】 If the refrigerant boils in the evaporator, the vaporization temperature is 5℃, The suction temperature of the compressor under the same pressure is 10℃, Then the suction superheat of the compressor is ( )℃.（  B  ）

A、10

B、5

C、-5

37、【 Single topic selection 】 Because frequency conversion energy regulation is ( ), therefore , It can achieve the best effect of energy regulation .（  A  ）

A、 Stepless

B、 Single stage

C、 Two stage

38、【 Single topic selection 】 The thermal expansion valve is a valve that automatically regulates the liquid supply to the evaporator , It mainly applies to ( ) Refrigeration system .（  B  ）

A、 ammonia

B、 Freon

C、 Lithium bromide

39、【 Single topic selection 】 The measures to prevent the nozzle blockage of absorber and condenser of lithium bromide absorption unit are ( ).（  A  ）

A、 Keep the unit in oxygen isolation state

B、 Change the solution regularly

C、 Expand the nozzle aperture

40、【 Single topic selection 】 The relay shall be adjusted according to the working conditions of refrigeration equipment , Test every year ( ) Time .（  A  ）

A、 One

B、 Two

C、 3、 ... and

41、【 Single topic selection 】 Ammonia refrigerant is flammable , In case of open fire, it will burn , The natural temperature of ammonia is generally ( )℃.（  B  ）

A、500

B、630

C、1000

42、【 Single topic selection 】 Ammonia, a common refrigerant, is combustible , When mixed with air, it will explode , The toxicity level of ammonia is ( ) level .（  A  ）

A、2

B、3

C、4

43、【 Single topic selection 】 Freon is ( ).（  B  ）

A、 The general name of all refrigerants

B、 Fluorine in saturated hydrocarbons 、 chlorine 、 Bromine derivatives

C、 The general name of all lubricating oils

44、【 Single topic selection 】 Electric expansion valve can be divided into deceleration type and ( ).（  B  ）

A、 Hyperactive

B、 Direct acting type

C、 Accelerated

45、【 Single topic selection 】 In order to ensure that the refrigeration compressor will not have wet stroke , A thermal expansion valve can be installed at the outlet of the evaporator to control the appropriate temperature ( ).（  A  ）

A、 Superheat

B、 Undercooling

C、 Dryness

46、【 Single topic selection 】 There are many ammonia refrigeration systems , The pipeline is complex , The common method of sewage discharge is ( ) Sewage discharge method .（  B  ）

A、 whole

B、 piecewise

C、 timing

47、【 Single topic selection 】 The evaporator tube group is immersed in the refrigerant water tank , The refrigerant evaporates in the tube , The refrigerant is under the action of the agitator , Flow in the box , To enhance heat transfer is ( ) evaporator .（  A  ）

A、 Spiral plate

B、 Plate

C、 Water tank type ( Immersive )

48、【 Judgment questions 】 If the seal of centrifugal ammonia pump leaks too much ammonia , The tightness of gland nut shall be adjusted .（  ×  ）

49、【 Judgment questions 】 The solubility of lithium bromide in water decreases with the decrease of temperature .（  √  ）

50、【 Judgment questions 】 Widely used F-11、F-12 Most refrigerant , The centrifugal refrigeration compressor is usually selected when the evaporation temperature is not too low and the refrigeration capacity is large .（  √  ）

51、【 Judgment questions 】 Oscilloscope is a common electrical instrument , Can't be used to measure frequency .（  ×  ）

52、【 Judgment questions 】 The relative temperature of civil air-conditioning room is... In summer 40%~60%.（  √  ）

53、【 Judgment questions 】 The solution concentration in the low-pressure generator in the lithium bromide absorption unit is too high , It indicates that the liquid level in the generator is too high .（  ×  ）

54、【 Judgment questions 】 No fire source is allowed at the operation and maintenance site of refrigeration and air conditioning equipment , However, it does not restrict maintenance personnel from smoking on site .（  ×  ）

55、【 Judgment questions 】 When adding lubricating oil to the centrifugal refrigeration unit, it must be filled according to the specified model .（  √  ）

56、【 Judgment questions 】 There will be oil film on the pipes of ammonia refrigeration system and the heat transfer surface inside the heat exchanger , Affect heat transfer effect , Condenser 、 The lower part of the liquid reservoir and evaporator needs to be drained regularly .（  √  ）

57、【 Judgment questions 】 The molecular formula of refrigerant ammonia is NH3.（  √  ）

58、【 Judgment questions 】 Ammonia absorption refrigeration system , The pressure in the condenser is determined by the condensation temperature .（  √  ）

59、【 Judgment questions 】 Water can be used as both refrigerant and refrigerant .（  √  ）

60、【 Judgment questions 】 Ethanol is nonflammable , So it doesn't have to be used in closed systems .（  ×  ）

61、【 Judgment questions 】 The evaporator is different according to the cooled medium , It is divided into cooling liquid and refrigerant 、 Cooling air or other gases .（  √  ）

62、【 Judgment questions 】 Electronic halogen leak detector generally includes sensor 、 Measuring line 、 The gas circuit consists of three parts .（  √  ）

63、【 Judgment questions 】 The simplest circuit consists of a power supply 、 load 、 Switch and connecting wire .（  √  ）

64、【 Judgment questions 】 In pressure test and leak detection , It is found that the system has leakage , Repair welding shall be carried out immediately .（  ×  ）

65、【 Judgment questions 】 In small refrigeration equipment , Capillary tube is often used to replace expansion valve as throttling device , It mainly depends on the size of pipe diameter and length to control the flow of liquid refrigerant .（  √  ）

66、【 Judgment questions 】 In the parts of refrigeration compressor , Because it often bears alternating load and impact load , Uneven wear is common .（  √  ）

67、【 Judgment questions 】 Adding hydrobromic acid to lithium bromide absorption unit can reduce the cost of solution PH value .（  √  ）

68、【 Judgment questions 】 Screw refrigeration compressor or refrigeration unit has passed strict pressure leak detection and vacuum leak detection during manufacturing , But after transportation and on-site hoisting , It may affect the tightness of the machine , Therefore, after the installation of the machine , Pressure retest is also required .（  √  ）

69、【 Judgment questions 】 The ammonia filling test of ammonia refrigeration system must be carried out after the air tightness test and vacuum pumping test are qualified .（  √  ）

70、【 Judgment questions 】 The heat absorbed from the medium in the cooling space when the refrigerant boils and vaporizes in the evaporator , Weigh the refrigerating capacity of the refrigeration system .（  √  ）

71、【 Judgment questions 】 To keep freon refrigerant dry , Prevent ice jam accidents , The refrigerant is charged through a dry filter .（  √  ）

72、【 Judgment questions 】“ Three don't hurt ” It means not to hurt yourself 、 Don't hurt others 、 Not hurt by others .（  √  ）

73、【 Judgment questions 】 Ammonia is a flammable but non-toxic gas .（  ×  ）

74、【 Judgment questions 】 The refrigeration equipment is in normal operation , When there is a sudden power failure , First, close the liquid supply valve in the system immediately , Then quickly close the suction and exhaust valves of the compressor .（  √  ）

75、【 Judgment questions 】 Accidental injury insurance is in the form of voluntary insurance .（  ×  ）

76、【 Judgment questions 】 Cylinders storing refrigerant must be painted with different colors according to the type of refrigerant ,R12 The bottle is white ,R134a It's green ,R717 It's yellow .（  ×  ）

77、【 Judgment questions 】 The capillary tube of the air conditioner is blocked , It will increase the discharge pressure of the compressor , The operating current increases .（  ×  ）

78、【 Judgment questions 】 For unmanned equipment room , Managers do not need to regularly check the operation of the equipment .（  ×  ）

79、【 Judgment questions 】 The higher the temperature of lithium bromide aqueous solution , The stronger its ability to absorb water vapor .（  ×  ）

80、【 Judgment questions 】 The difference between evaporation temperature and chilled water outlet temperature increases or decreases with the increase or decrease of evaporator cooling load .（  √  ）

81、【 Judgment questions 】 The piston compressor works through the cylinder 、 The working volume formed by the air valve and the piston reciprocating in the cylinder is constantly changing .（  √  ）

82、【 Judgment questions 】 Rolling rotor compressor is also called rolling piston compressor or fixed sliding vane compressor , It is a kind of rotary compressor .（  √  ）

83、【 Judgment questions 】 The absorber and condenser of most lithium bromide absorption units adopt spray forest structure . Practice has proved , Chlorine in solution 、 High sodium content will cause the nozzle with small aperture to be blocked .（  ×  ）

84、【 Judgment questions 】 During the operation of lithium bromide absorption unit , Various parameters of the refrigerator, abnormal conditions during operation and troubleshooting process shall be recorded , Usually every hour or every 2h Record 1 Time .（  √  ）

85、【 Judgment questions 】 When anti-corrosion treatment is carried out for ammonia refrigeration pipeline system , Refrigeration compressors and units and air coolers do not need painting .（  √  ）

86、【 Judgment questions 】 The safety valve leaks due to tripping or lax closure , The safety valve shall be replaced with a new one or the original one shall be disassembled and repaired, and shall be reused after being verified to be qualified by the special department .（  √  ）

87、【 Judgment questions 】R134r It's a chlorine free refrigerant , Its non-destructive effect on the atmospheric ozone layer , But it's a greenhouse gas , Once released into the atmosphere , Will enhance the greenhouse effect .()（  √  ）

88、【 Judgment questions 】 The pressure test and leak detection of ammonia refrigeration system cannot be carried out at the same time .（  ×  ）

89、【 Judgment questions 】 Different brands and types of compressor oils can be mixed at any time .（  ×  ）

90、【 Judgment questions 】 When the compressor of electronic temperature controlled refrigerator does not start , Generally, we first use the voltage range of the multimeter to check the resistance value of the compressor .（  ×  ）

91、【 Judgment questions 】 The motor power of the fuel pump of the direct fired lithium bromide absorption unit shall be as large as the rated power of the oil pump .（  ×  ）

92、【 Judgment questions 】 Special operation practitioners can go to any training institution with safety training qualification certificate for special operation training .（  ×  ）

93、【 Judgment questions 】 Use refrigerant instead of lubricating oil .（  ×  ）

94、【 Judgment questions 】 In centrifugal chillers , If the refrigeration system is mixed with air , Then the suction temperature and exhaust temperature will rise .（  √  ）

95、【 Judgment questions 】 The solution circulation process of double effect absorption chiller has series process 、 There are three kinds of parallel process and series parallel process .（  √  ）

96、【 Judgment questions 】 Personnel engaged in operations exposed to occupational hazards , Occupational health examination shall be conducted when leaving the post , Otherwise, the employer shall not dissolve or terminate the labor contract concluded with it .（  √  ）

97、【 Judgment questions 】 Demolition must be carried out from top to bottom layer by layer , It is strictly forbidden to 、 Work at the same time .（  √  ）

98、【 Judgment questions 】 When installing ammonia refrigeration system , Rubber band must be embedded in the wire perforation of fan and other electromechanical equipment , And do a good job in moisture-proof sealing treatment .（  √  ）

99、【 Judgment questions 】 The bearing that overcomes the axial thrust generated when the rotor rotates and compresses the gas is the auxiliary bearing .（  √  ）

100、【 Judgment questions 】 Gauge pressure is the sum of absolute pressure and local atmospheric pressure .（  ×  ）

Support the test questions of the operation test of precision refrigeration and air conditioning equipment in all regions of the country , Support safety certificate , Special operation certificate , Exercises on the question bank of vocational skill appraisal and other types of work .