2022 judgment questions and answers for operation of refrigeration and air conditioning equipment

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

2022 The review questions for the operation of refrigeration and air conditioning equipment are the practice questions for the operation of refrigeration and air conditioning equipment ！2022 The judgment questions and answers of refrigeration and air conditioning equipment operation are based on the new examination outline of refrigeration and air conditioning equipment operation . The simulation questions of refrigeration and air conditioning equipment operation test pass the safety production simulation test and practice in the intelligent examination room .

1、【 Single topic selection 】R134a Refrigerant belongs to freon refrigerant ( ) class .（  C  ）

A、CFC

B、HCFC

C、HFC

2、【 Single topic selection 】 Generally, the temperature range of mercury thermometer is ( ).（  A  ）

A、-30℃ to 300℃

B、0℃ to 100℃

C、100℃ to 300℃

3、【 Single topic selection 】 The accuracy requirements of the pressure gauge for the pressure test of the central air conditioning water system are ( ) magnitude .（  B  ）

A、1.5

B、2.5

C、3.5

4、【 Single topic selection 】 On the properties of lithium bromide aqueous solution , The correct group of the following statements is ( ).（  A  ）

A、 Lithium bromide aqueous solution has strong hygroscopicity

B、 Lithium bromide aqueous solution is less corrosive to general metal materials

C、 The temperature of lithium bromide aqueous solution is too low or the concentration is too high , Are prone to crystallization

5、【 Single topic selection 】 Full liquid pipes and containers in refrigeration system ,( ).（  B  ）

A、 The valves at both ends can be closed at the same time

B、 It is forbidden to close the valves at both ends at the same time

C、 Determine whether to close the valves at both ends at the same time according to the site conditions

6、【 Single topic selection 】 During the test run of the refrigeration system , Check the lubricating oil temperature , Generally not more than 70℃, No less than ( )℃.（  A  ）

A、5

B、10

C、15

7、【 Single topic selection 】 Because the increased flow by hot gas bypass does not produce any useful cooling capacity , Therefore, the hot gas bypass is adopted to reduce the load and reduce the power at the same time ( ).（  A  ）

A、 unchanged

B、 falling

C、 rising

8、【 Single topic selection 】 The repair principle of household refrigerator is ( ).（  B  ）

A、 Cost saving is the basic requirement

B、 Reliable operation is the basic requirement

C、 Restoring the original appearance is the basic requirement

9、【 Single topic selection 】 The sequence of fault inspection of refrigeration unit is ( ).（  A  ）

A、 Electrical system - Water system - Oil system - Refrigeration system

B、 Water system - Electrical system - Refrigeration system - Oil system

C、 Refrigeration system - Oil system - Water system - Electrical system

10、【 Single topic selection 】 Small refrigeration systems are prone to blockage at the capillary , It can be judged that the phenomenon of dirty blockage is ( ).（  A  ）

A、 The frosting position starts from the dirty blockage of the capillary

B、 The frosting position starts from the capillary outlet

C、 The capillary tube is frosted as a whole

11、【 Single topic selection 】 Being fair means that professionals should do ( )（  C  ）

A、 Principle first , not swayed by personal considerations , appoint people on their merit , Don't avoid intimacy

B、 Contribute to society 、 Open minded 、 Be warm to people 、 Be thrifty in your family

C、 Support the truth 、 Distinguish between public and private 、 Fair and just 、 aboveboard

D、 Sacrifice yourself 、 To help others 、 The neighborhood is harmonious 、 be open and aboveboard

12、【 Single topic selection 】 Processing method of clamping specific positioning elements , Common parts and machining methods ( ).（  C  ）

A、 Completely different

B、 Exactly the same

C、 Part of the same , Part of it's different , High precision is required

D、 I'm not sure , The change is too big

13、【 Single topic selection 】 In industrial cryogenic devices , Most centrifugal refrigerators use ( ) compressor .（  C  ）

A、 Single stage

B、 second level

C、 multistage

14、【 Single topic selection 】 The marking direction of the inside diameter micrometer is the same as that of the outside diameter micrometer ( ).（  B  ）

A、 identical

B、 contrary

C、 be similar

D、 Different

15、【 Single topic selection 】 Tungsten argon arc welding can be divided into AC power supply according to the type of power supply 、( )、 AC / DC dual-purpose power supply and pulse power supply .（  B  ）

A、 Hybrid power supply

B、 DC power supply

C、 Half wave power supply

D、 High frequency power supply

16、【 Single topic selection 】 The following ( ) With opaque 、 Glossy 、 It has properties such as ductility .（  A  ）

A、 tungsten

B、 carbon

C、 sulfur

D、 phosphorus

17、【 Single topic selection 】 Measure the reactive energy of three-phase four wire asymmetric load , application （）.（  C  ）

A、 have 60° Three phase reactive energy meter with phase difference

B、 Three phase active energy meter

C、 Three phase reactive energy meter with additional current coil

D、 Single phase active energy meter

18、【 Single topic selection 】 For section views , The incorrect statement is ：( ).（  C  ）

A、 The view can be divided into full sections according to the cutting range 、 Half section and partial section

B、 Section views should generally be marked

C、 When cutting, one or more planes can be used to cut the object , However, other cut planes cannot be used

D、 Sectioning is just an imaginary drawing method , Except section view , Other views are not affected

19、【 Single topic selection 】 Method of finding DC grounding of substation , Which of the following is wrong ( ).（  D  ）

A、 When checking with an instrument , The internal resistance of the instrument used shall not be less than 2000Ω/V

B、 When DC is grounded , It is forbidden to work on the secondary circuit

C、 The treatment shall not cause DC short circuit and grounding at another point

D、 The search and processing must be carried out by one person under the command of the dispatcher

20、【 Single topic selection 】 We can use chemical test paper to detect the leakage of ammonia refrigeration system , If ammonia leaks , Then the color of the test paper becomes ( ).（  C  ）

A、 The light blue

B、 Dark green

C、 Pink

21、【 Single topic selection 】 Repair T68 The spindle in the boring machine spindle mechanism has no deformation , The wear is not serious 、 Roundness is less than 0.03mm, The recommended repair method should be ( ) Handle .（  B  ）

A、 Chrome plating

B、 Nitriding

C、 grind

D、 Grinding

22、【 Single topic selection 】 When installing ammonia refrigeration pipeline system , When the high-pressure exhaust pipe from the compressor to the outdoor condenser passes through the wall , The gap to be reserved is ().（  C  ）

A、5mm to 10mm

B、0mm to 5mm

C、10mm to 20mm

23、【 Single topic selection 】 Installation of bridge crane 、 debugging , Including preparations before installation 、() And commissioning .（  C  ）

A、 Crane installation

B、 Track installation

C、 Installation of crane and rail

D、 Crane and trolley installation

24、【 Single topic selection 】 Ammonia refrigeration system , The sealing gasket in contact with the preparation must be of high purity () material .（  B  ）

A、 copper

B、 aluminum

C、 steel

25、【 Single topic selection 】 accord with “ or ” The expression of logical relation is ().（  B  ）

A、110

B、1+1=1

C、1+1=10

D、1+1=2

26、【 Single topic selection 】 Double crank mechanism ( ) when , If the crank turns the same , It is called parallelogram mechanism .（  A  ）

A、 The length of the connecting rod is equal to that of the frame and the length of the two cranks is equal

B、 The length of the connecting rod is equal to that of the frame, but the length of the two cranks is not equal

C、 The length of the connecting rod and the frame is not equal, and the length of the two cranks is not equal

D、 The length of the connecting rod and the frame is not equal, but the length of the two cranks is equal

27、【 Single topic selection 】 Start the ladder diagram according to the motor sequence , The following instructions are correct ( ).（  C  ）

A、LDIT20

B、ANDX001

C、OUTY002

D、ANDX002

28、【 Single topic selection 】 During pipeline welding of ammonia refrigeration system , The number of repair welds shall not exceed ( ) Time .（  B  ）

A、1

B、2

C、3

29、【 Single topic selection 】 When checking the parallelism of the slide guide rail of the horizontal boring machine in the vertical plane , On the workbench and the guide rail of the bed ( ) Put a level .（  C  ）

A、 tilt 450

B、 vertical

C、 parallel

D、 arbitrarily

30、【 Single topic selection 】 When the three-phase power supply winding is star connected , The relationship between line voltage and phase voltage is ( )（  D  ）

A、Um=√2Um

B、 The line voltage lags behind the corresponding phase voltage 30°

C、U Line =U phase

D、 The line voltage precedes the corresponding phase voltage 30°

31、【 Single topic selection 】 The allowable sag error of conductor installation shall not exceed ().（  B  ）

A、±2%

B、±5%

C、±6%

D、±8%

32、【 Single topic selection 】 TIG welding gun is divided into ( ) Type welding gun and water-cooled welding gun .（  D  ）

A、 Side feed

B、 pistol

C、 Oil is cold

D、 Air cooling

33、【 Single topic selection 】 When carbon arc gouging ,( ), Prevent hot metal and slag from burning work clothes and scalding skin .（  B  ）

A、 Try to operate against the wind

B、 Try to operate downwind

C、 Try to operate in crosswind

D、 As long as it's not downwind

34、【 Single topic selection 】 magnetic circuit ( ) state .（  A  ）

A、 There is no open circuit

B、 There is an open circuit

C、 There's a short circuit

D、 Yes , Exactly the same as the circuit

35、【 Single topic selection 】 Overload protection of high voltage motor , Its protective wiring can be , Safe production Mock test Try a little , use ().（  C  ）

A、 Two phase incomplete star connection

B、 Two phase differential connection

C、 Two phase incomplete star connection or two-phase differential connection

D、 No regulations

36、【 Single topic selection 】 Bistable trigger pulse is too narrow , What will happen to the circuit is ().（  C  ）

A、 Somersault

B、 Normal flip

C、 Trigger without flipping

D、 All the above statements are right

37、【 Single topic selection 】 In motion DB-45 Type insulating oil , When checking the oil sample by visual inspection ,（） Carbon particles and mechanical impurities .（  D  ）

A、 Trace amounts of are allowed

B、 A certain amount is allowed

C、 A small amount of is allowed

D、 There should be no

38、【 Single topic selection 】 The matching of flat key and keyway generally adopts ( )（  A  ）

A、 Clearance fit

B、 Interference fit

C、 Transition fit

D、 Fit tolerance

39、【 Single topic selection 】 The voltage transformer changes the high voltage of the system into ( ) V standard low voltage .（  A  ）

A、100 or 100/√3

B、36

C、50

D、220

40、【 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

41、【 Single topic selection 】 In order to prevent a series of adverse conditions caused by excessive exhaust temperature in piston compressor , The outlet of the compressor shall be equipped with ( ).（  B  ）

A、 Suction temperature controller

B、 Exhaust temperature controller

C、 Economizer

42、【 Single topic selection 】 There is also lithium bromide solution in the cooling of lithium bromide absorption refrigeration unit , The possible reason is ().（  A  ）

A、 The liquid level in the generator is too high

B、 The liquid level in the generator is too low

C、 The cooling water temperature is too low

43、【 Single topic selection 】 The quality of workers refers to ( )（  C  ）

A、 degree of education

B、 Technical proficiency

C、 Professional ethics and professional skills

D、 Ideological awareness

44、【 Single topic selection 】 One of the characteristics of professional ethics is ( ).（  B  ）

A、 mandatory

B、 Limited scope of application

C、 Legal effect

D、 Dependability

45、【 Single topic selection 】 Attention should be paid to the manual operation of guide vane switch type of centrifugal refrigeration unit , In order to skip the surge prone area when the unit is just started , It is necessary to continuously drive the guide vane to ()% above .（  A  ）

A、30

B、20

C、40

46、【 Single topic selection 】 The line loss rate from the receiving end to the electric equipment stipulated in China , Users of primary transformer shall be limited to () following .（  A  ）

A、0.035

B、0.045

C、0.055

D、0.065

47、【 Single topic selection 】 For motor operation with sliding bearings ( ) Replace the lubricating oil after hours .（  A  ）

A、1000

B、1500

C、2000

D、500

48、【 Single topic selection 】 Judge the direction of the magnetic field generated by the current with .（  D  ）

A、 Left hand rule

B、 Right-hand rule

C、 Motor rule

D、 Ampere rule

49、【 Single topic selection 】 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 , happen ( ).（  A  ）

A、 surge

B、 Liquid hammer

C、 overload

50、【 Single topic selection 】 Detect the positioning accuracy after the worktable of coordinate boring machine moves , Must be in ( ) Conduct .（  A  ）

A、 Table clamping state

B、 The workbench is in a loose state

C、 Working status of workbench

D、 Any state

51、【 Single topic selection 】 The adjustable guide vane of centrifugal compressor is to make the air flow ( ).（  A  ）

A、 Change direction

B、 Change the volume

C、 Increase the pressure

52、【 Single topic selection 】( ) It is a common problem in welding titanium and titanium alloys .（  C  ）

A、 High melting point of oxide film , Slag inclusion is easy to occur

B、 There are many impurities , Cause thermal cracks

C、 Easy to stain , Cause embrittlement

D、 No significant color change during melting , Easy to collapse

53、【 Single topic selection 】 When one phase fuse on the high voltage side of the transformer is broken , What is the situation on the low pressure side ().（  D  ）

A、 Partial power failure

B、 One phase has electricity

C、 One phase voltage is reduced by half , The two phases are normal

D、 The two-phase voltage is reduced by half , One phase is normal

54、【 Single topic selection 】 After passing the safety training for new employees of high-risk enterprises , Under the leadership of experienced workers , Internship at least ( ) You can work independently after months .（  B  ）

A、1

B、2

C、3

55、【 Judgment questions 】30 The work at heights above meters is classified as class I work at heights .（  ×  ）

56、【 Judgment questions 】 The solution to saturation distortion is to make the operating point Q Improve .（  ×  ）

57、【 Judgment questions 】 The diameter of the round rod is too large, which makes it difficult for the die to cut in .（  √  ）

58、【 Judgment questions 】 Parallel operation of power transformers means that their primary sides are connected separately 、 The operator connected to each other on the secondary side . Safety production mold To be tested A little . type .（  ×  ）

59、【 Judgment questions 】R134a It is a safe refrigerant , Its lubricating oil is not mineral oil , It's a synthetic polyester oil .（  √  ）

60、【 Judgment questions 】T4145 Coordinate boring machine can be used for precision marking of sample plate and measurement of precision parts .（  √  ）

61、【 Judgment questions 】 Generally speaking , Where there is relative motion , Parts that rub against each other will wear to varying degrees .（  √  ）

62、【 Judgment questions 】 Although glycol liquid is slightly toxic , But no harm .（  √  ）

63、【 Judgment questions 】 Epoxy resin has high bonding strength and no deformation of parts , It is also convenient for mold repair , Therefore, it is most widely used in mold assembly .（  √  ）

64、【 Judgment questions 】 Change the state of matter , And when its temperature remains constant , The heat absorbed or released by it is called latent heat .（  √  ）

65、【 Judgment questions 】() The symbol of Zener diode is the same as that of ordinary diode .（  ×  ）

66、【 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 .（  √  ）

67、【 Judgment questions 】 The electrical strength of insulating oil refers to the instantaneous breakdown voltage value during measurement .（  √  ）

68、【 Judgment questions 】 Thyristor bridge phase shift trigger circuit , The trigger signal is a sine wave , Therefore, the conduction point is stable .（  ×  ）

69、【 Judgment questions 】 Static of amplifying circuit , It refers to the initial state before AC signal is added .（  √  ）

70、【 Judgment questions 】 In the normal operation of lithium bromide absorption unit, under the same external conditions , The liquid level of refrigerant water is too high , It is mainly caused by refrigerant water pollution or insufficient vacuum .（  √  ）

71、【 Judgment questions 】() Carbon steel contains iron except 、 Other than carbon , And a small amount of silicon 、 manganese 、· Latest solution Analysis · sulfur 、 Phosphorus and other impurities .（  √  ）

72、【 Judgment questions 】 In the refrigeration system using freon refrigerant , Be sure to install the dryer .（  √  ）

73、【 Judgment questions 】 The quality policy shall be based on the quality objectives .（  ×  ）

74、【 Judgment questions 】 For single effect lithium bromide absorption unit , The pressure behind the drain valve at the outlet of the solution pump is not necessarily positive , You need to block the valve port with your thumb to judge .（  √  ）

75、【 Judgment questions 】() The horizontal fixed position of the pipe shall be welded upward in two semicircles , From the equivalent of “ The clock 12 spot ” Location ( Flat welding ) rise , amount to “ The clock 6 Point location ”( Overhead welding ) Stop the arc .（  ×  ）

76、【 Judgment questions 】 When a person inhales ammonia and coughs , You can cover your mouth and nose with a wet towel or a towel dipped in vinegar , To reduce the irritation of ammonia to the respiratory tract .（  √  ）

77、【 Judgment questions 】 The suction loss affecting the gas transmission coefficient is due to the power loss caused by the gas passing through the suction pipeline and orifice , Reduce the suction pressure , Reduces the density of the inhaled gas , Accordingly, the amount of gas inhaled by the compressor is reduced .（  √  ）

78、【 Judgment questions 】() Special high-quality carbon structural steel , The steel grade used for welding is indicated as “HP”.（  ×  ）

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

80、【 Judgment questions 】 most ‘ Security Production simulation exam A little ‘ A simple circuit consists of a power supply 、 load 、 Switch and connecting wire .（  √  ）

81、【 Judgment questions 】 The oxygen cylinder is strictly prohibited to be close to inflammables and grease .（  √  ）

82、【 Judgment questions 】 The refrigerant pipe in ammonia refrigeration system can be copper pipe .（  ×  ）

83、【 Judgment questions 】 Integrated voltage stabilizing block belongs to the category of linear integrated circuit .（  ×  ）

84、【 Judgment questions 】 The scribed line of the double dividing plate autocollimator is located in the center of the field of view , Eyepiece focal length is short .（  √  ）

85、【 Judgment questions 】 The mass of the crankshaft of the piston compressor is transformed in the calculation of inertial force , The mass of the part symmetrical to the crankshaft axis should also be simplified to the crank pin .（  ×  ）

86、【 Judgment questions 】 Assembly accuracy of group assembly method ,“ Safety student production model I plan to take an exam Diantong “ It depends entirely on the machining accuracy of the part .（  ×  ）

87、【 Judgment questions 】 The three main moving parts of piston compressor are crankshaft 、 Connecting rod and piston .（  √  ）

88、【 Judgment questions 】 Screw transmission is mainly used to convert rotary motion into linear motion .（  √  ）

89、【 Judgment questions 】 The piston type multi head chiller is equipped with a shield pump .（  ×  ）

90、【 Judgment questions 】 Due to the busy task, the employer can arrange the workers to engage in the operation exposed to occupational disease hazards first , Pre job occupational health examination shall be carried out after leisure .（  ×  ）

91、【 Judgment questions 】 Electronic halogen leak detector is an instrument that can detect the leakage of Freon halogen gas filled in the sealing system .（  √  ）

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

93、【 Judgment questions 】() At rated voltage 500 The watt bulb is 2 The electric energy consumed in an hour is 0.5 degree .（  ×  ）

94、【 Judgment questions 】 The alloy of copper and tin is called brass .（  ×  ）

95、【 Judgment questions 】 Centrifugal refrigeration compressor is not a positive displacement compressor .（  √  ）

96、【 Judgment questions 】 All the high-pressure condensate passing through the throttling mechanism is depressurized into the low-pressure condensate required by the evaporator .（  ×  ）

97、【 Judgment questions 】 The centrifugal refrigeration compressor with certain structure can only adapt to one kind of refrigerant .（  √  ）

98、【 Judgment questions 】 The shell of screw compressor has no cooling water jacket .（  √  ）

99、【 Judgment questions 】 The gas transmission coefficient of screw compressor is higher than that of piston compressor and other types of rotary compressor , And the change is flat .（  √  ）

100、【 Judgment questions 】 Oil temperature of lubricating oil during operation , Open type units shall not be greater than 70℃, Semi enclosed units shall not be greater than 80℃.（  √  ）

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 .