Registration of Electrical Engineering (elementary) examination in 2022 and the latest analysis of Electrical Engineering (elementary)

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1、【 Single topic selection 】 The insulation resistance of mountain hand-held electric tools shall not be less than ()MΩ.（  B  ）

A、0.5

B、1

C、2

D、7

2、【 Single topic selection 】 resistance R1,R2,R3 Connected in series to the power supply , If the voltage relationship on the resistance is U1＞U3＞U2, Then the relationship between the three resistance values is ().（  B  ）

A、R1＜R2＜R3

B、R1＞R3＞R2

C、R1＜R3＜R2

D、R1＞R2＞R3

3、【 Single topic selection 】 Inductance is L The coil is connected to the DC power supply, and its inductive reactance XL().（  C  ）

A、 Related to current

B、 Related to resistance

C、 zero

D、 Greater than zero

4、【 Single topic selection 】 The handle of the wire stripping pliers is sleeved with the rated working voltage 500V Of ().（  D  ）

A、 Wooden pipe

B、 Aluminum tube

C、 Copper tube

D、 Insulating sleeve

5、【 Single topic selection 】 The apparent power of series sinusoidal AC circuit characterizes the performance of the circuit ().（  A  ）

A、 The product of total voltage RMS and current RMS in the circuit

B、 Average power

C、 Instantaneous power max

D、 Reactive power

6、【 Single topic selection 】 As shown in the figure , by () Graphical symbol of triode .（  A  ）

A、 Ordinary

B、 Luminescence

C、 Photoelectricity

D、 constant current

7、【 Single topic selection 】 Which of the following capacitors is not an organic dielectric capacitor ().（  D  ）

A、 Polyester dielectric capacitor

B、 Polystyrene dielectric capacitor

C、 Film dielectric capacitor

D、 Monolithic capacitor

8、【 Single topic selection 】 Common hard magnetic materials are ().（  D  ）

A、 Silicon steel sheets

B、 Permalloy

C、 Ferrite

D、 Carbon steel

9、【 Single topic selection 】 When selecting AC contactor , To be determined () And determine the specific type .（  D  ）

A、 Rated working voltage

B、 Rated working current

C、 Auxiliary contact

D、 Number of poles and type of current

10、【 Single topic selection 】() It works in the reverse bias state , from PN Work with the change of junction capacitance .（  A  ）

A、 Switching diodes

B、 Varactor diode

C、 Zener diode

D、 Detector diode

11、【 Single topic selection 】 The capacity of single-phase asynchronous motor generally does not exceed ().（  A  ）

A、0.6KW

B、1KW

C、10KW

D、30KW

12、【 Single topic selection 】220V Single phase sinusoidal alternating current refers to its () The value is 220V.（  B  ）

A、 Maximum

B、 Valid values

C、 Average

D、 Instantaneous value

13、【 Single topic selection 】 The staff are close to 35KV The safe distance of live equipment is ().（  B  ）

A、0.7m

B、1m

C、1.2m

D、1.5m

14、【 Single topic selection 】 The grounding body mostly adopts () Made from , Its section shall meet the requirements of thermal stability and mechanical strength .（  C  ）

A、 Any metal material

B、 Copper aluminum material

C、 Section steel

D、 Insulated conductor

15、【 Single topic selection 】 When the wire is connected in the terminal in the junction box () insulation .（  B  ）

A、 It needs to be added

B、 No need to add

C、 Use black tape

D、 Use transparent tape

16、【 Single topic selection 】 The following statement about capacitive reactance is correct ().（  B  ）

A、 The capacitive reactance is proportional to the frequency

B、 The capacitive reactance is inversely proportional to the frequency

C、 Capacitive reactance is independent of frequency

D、 Capacitive reactance depends only on capacitance

17、【 Single topic selection 】 When measuring with a clamp on ammeter , Range at 5A files , The measured wire is wound in the jaw , The reading is 2A, Then the effective value of AC current in the conductor is ().（  B  ）

A、2A

B、1A

C、4A

D、2.8A

18、【 Single topic selection 】 After the silica gel in the transformer respirator is damp , Its color changes to ().（  A  ）

A、 Pink

B、 Red

C、 Purplish red

D、 Blue

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

A、±2%

B、±5%

C、±6%

D、±8%

20、【 Single topic selection 】 The model of aluminum core neoprene insulated wire is ().（  D  ）

A、BLV

B、BLX

C、BLVV

D、BLXF

21、【 Single topic selection 】 Capacitor filter circuit generally adopts high-capacity filter () Capacitor .（  A  ）

A、 electrolysis

B、 ceramics

C、 mica

D、 Metallized paper medium

22、【 Single topic selection 】 Among the following tools , It belongs to the basic safety appliance of common low-voltage insulation ().（  B  ）

A、 Electrician knife

B、 Low voltage electroscope

C、 Insulating rod

D、 Protective glasses

23、【 Single topic selection 】 The iron core section of large transformer often adopts ().（  C  ）

A、 square

B、 Rectangle

C、 Stepped

D、 Other shapes

24、【 Single topic selection 】 If a section of resistance is R The conductor is evenly stretched to twice its original length , Then the resistance value is ().（  A  ）

A、2R

B、R/2

C、4R

D、R/4

25、【 Single topic selection 】 When the terminal pole adopts one-sided cross arm, it shall be installed in () One side .（  C  ）

A、 Power side

B、 Power receiving side

C、 Stay wire side

D、 Tension side

26、【 Single topic selection 】 Power off braking control circuit of electromagnetic holding brake , When the electromagnetic holding brake coil () when , The motor stalled quickly .（  A  ）

A、 Power failure

B、 Power on

C、 The current is very high

D、 A short circuit

27、【 Single topic selection 】 If there is a large difference between the forward and reverse resistances of the diode, it indicates that the diode ().（  C  ）

A、 Has broken down

B、 Poor unidirectional conductivity

C、 Good unidirectional conductivity

D、 Internal open circuit

28、【 Single topic selection 】 One power consumption 1000 watts , Voltage is 180V According to the load of () One scheme is to select the power meter limit to measure the load power .（  D  ）

A、5 Ann ,150 v

B、5 Ann ,300 v

C、10 Ann ,150 v

D、10 Ann ,300 v

29、【 Single topic selection 】 When the asynchronous motor works in the power generation state , The range of its slip rate is ().（  C  ）

A、s＝1

B、s＞0

C、s＜0

D、s＝0

30、【 Single topic selection 】 The supply voltage drops to... Of the rated value 70% when , Incandescent lights will ().（  D  ）

A、 Blue light

B、 Completely extinguished

C、 Bright and dark

D、 The light dimmed

31、【 Single topic selection 】 When installing screw fuse , The power cord must be connected to the... Of the porcelain base () Terminals .（  D  ）

A、 Left

B、 Right

C、 On

D、 Next

32、【 Single topic selection 】 In the three-phase neutral protection system , Protective zero line and working zero line shall not be installed () Or circuit breaker .（  C  ）

A、 transformer

B、 Transformer

C、 Fuse

D、 Relay

33、【 Single topic selection 】 Three resistors Ｒ1、R2、R3 Connected in series to a DC power supply , It is known that the relationship between the three resistances is R1＞Ｒ2＞Ｒ3, Then the voltage relationship between them is ().（  B  ）

A、U1＝U2＝U3

B、U1＞Ｕ2＞Ｕ3

C、Ｕ1＜Ｕ2＜Ｕ3

D、Ｕ2＞Ｕ1＞Ｕ3

34、【 Single topic selection 】 The power control circuit consists of a fuse 、 Thermal relay 、 Button 、 Travel switch 、() Other components .（  C  ）

A、 Main contact of contactor

B、 Busbars

C、 Contactor coil

D、 motor

35、【 Single topic selection 】 To be on the safe side , When installing voltage transformer , must ().（  B  ）

A、 Core grounding

B、 One end of the iron core and auxiliary winding shall be reliably grounded

C、 One end of the secondary winding is grounded

D、 One end of the high voltage winding is grounded

36、【 Single topic selection 】 Self coupling step-down starter for three-phase motor 80% When starting with tap down , The starting torque of the motor is the of the full voltage starting torque ()%.（  B  ）

A、36

B、64

C、70

D、81

37、【 Single topic selection 】 The fusing current of the melt is generally... Of the rated current ().（  B  ）

A、1～1.5 times

B、1.5～2 times

C、2～2.5 times

D、4～7 times

38、【 Single topic selection 】 When using an insulation resistance meter, shake the handle evenly , Its speed is generally maintained at ()r/min about （  C  ）

A、10

B、60

C、120

D、240

39、【 Single topic selection 】 Permeability μ The unit is ().（  A  ）

A、H/m

B、H·m

C、T/m

D、Wb·m

40、【 Single topic selection 】 When electricity flows continuously through a section of conductor with uneven thickness , The current intensity on each cross section of the conductor ().（  C  ）

A、 Directly proportional to the cross-sectional area

B、 Inversely proportional to the cross-sectional area

C、 Independent of the cross-sectional area

D、 With the change of cross-sectional area

41、【 Single topic selection 】 The voltage at two points in the circuit is high , be ().（  C  ）

A、 These two potentials are also high

B、 The potentials at both points are greater than zero

C、 The potential difference between these two points is large

D、 With these two potential difference switches

42、【 Single topic selection 】 The thermal relay consists of thermal elements 、 Contact system 、()、 It is composed of reset mechanism and current setting device .（  C  ）

A、 Handle

B、 coil

C、 Action mechanism

D、 electromagnet

43、【 Single topic selection 】 a 4 Thousands of fatigue ,0.4 KV single-phase phase-shifting capacitor works under rated state , Its current is ().（  A  ）

A、10A

B、100A

C、20A

D、1A

44、【 Single topic selection 】 Feedback braking of three-phase asynchronous motor , Convert mechanical energy into electrical energy , Give back to ().（  D  ）

A、 load

B、 Rotor winding

C、 Stator winding

D、 Power grid

45、【 Single topic selection 】 In the analytic expression u＝310Sin(ωT+φ) in () Is the phase angle of this sinusoidal quantity .（  A  ）

A、(ωT+φ)

B、310

C、φ

D、ωT

46、【 Single topic selection 】 If the maximum current in a sinusoidal AC circuit is 141A, Then its valid value is ().（  A  ）

A、100A

B、1.4A

C、10A

D、5A

47、【 Single topic selection 】 About the use of herringbone ladder , The following incorrect method is ().（  A  ）

A、 Use the riding standing posture

B、 Two anti-skid pull ropes shall be bound in the middle

C、 Should stand on one side

D、 Try to keep your feet on the same plane

48、【 Single topic selection 】 The control circuit of two speed motor uses () A contactor connects the stator winding into YY Of .（  B  ）

A、1

B、2

C、3

D、4

49、【 Single topic selection 】 Drill holes on the wall or ground of brick concrete structure with small hole diameter , Should be selected ()（  B  ）

A、 Electric drill

B、 Percussion drill

C、 Electric hammer

D、 Bench drill

50、【 Single topic selection 】 The general steps of assembling AC contactor are ().（  A  ）

A、 Move the iron core — Static iron core — Auxiliary contact — Main contact — Arc shield

B、 Move the iron core — Static iron core — Auxiliary contact — Arc shield — Main contact

C、 Move the iron core — Static iron core — Main contact — Arc shield — Auxiliary contact

D、 Static iron core — Auxiliary contact — Arc shield — Main contact — Move the iron core

51、【 Single topic selection 】 The electric angle corresponding to the stator circumference of the eight pole three-phase asynchronous motor is ().（  C  ）

A、360

B、1080

C、1440

D、2880

52、【 Single topic selection 】 Aluminum conductors are generally used for ().（  A  ）

A、 Outdoor overhead line

B、 Indoor lighting line

C、 Workshop power line

D、 Power socket line

53、【 Single topic selection 】 The instruments and relays in the secondary side circuit of current transformer must be ().（  A  ）

A、 Series connection

B、 parallel connection

C、 Mixed combination

D、 It can be connected arbitrarily

54、【 Single topic selection 】 Wire pliers （ Electrician pliers ） Can be used to cut ().（  A  ）

A、 Thin wire

B、 glass tube

C、 Copper bar

D、 Water pipe

55、【 Single topic selection 】 Nominal section of conductor commonly used in China 2225mm And 50mm The section of the primary conductor in the middle of the is ()mm2.（  B  ）

A、30

B、35

C、40

D、45

56、【 Single topic selection 】 Energy consumption braking of three-phase asynchronous motor , Motor in () Running state .（  B  ）

A、 electric

B、 Electricity generation

C、 start

D、 adjust speed

57、【 Single topic selection 】 Neutral protection is suitable for the secondary side of power transformer () Grounding occasion .（  A  ）

A、 The neutral point

B、 Phase line

C、 Zero line

D、 Shell

58、【 Single topic selection 】 The function of transformer impedance transformation is often used in () The occasion of .（  D  ）

A、 Low voltage distribution

B、 High voltage transmission

C、 Power amplification

D、 impedance matching

59、【 Single topic selection 】 High voltage pulse is used to promote the discharge of cable fault point , Generate discharge sound , Use a sensor to receive this discharge sound on the ground , So as to measure the precise position of the fault point , This method is called ().（  A  ）

A、 Sound measurement

B、 Induction method

C、 Probe method

D、 Current method

60、【 Single topic selection 】 Single phase power supply (), It should be connected to the screw thread of the lamp cap .（  A  ）

A、 Zero line

B、 Phase line

C、 zero 、 Phase line

D、 Fire line

61、【 Single topic selection 】 Clamp on ammeter is compared with ordinary ammeter , Its measurement error ().（  A  ）

A、 more

B、 smaller

C、 zero

D、 equally

62、【 Single topic selection 】 As shown in the figure , It is known that the stable voltage of the voltage stabilizing tube is 5.3V, When the voltage stabilizing tube is conducting in the positive direction, the tube pressure drop is 0.7V, Then the output voltage is () v .（  B  ）

A、5.3

B、1.4

C、10.6

D、6

63、【 Single topic selection 】 The control circuit of two speed motor uses () To realize the connection of stator winding Δ and YY Of .（  A  ）

A、 Contactor

B、 Thermal relay

C、 Fuse

D、 Position switch

64、【 Single topic selection 】 The speed regulation methods of two speed asynchronous motor are () Kind of .（  C  ）

A、1

B、2

C、3

D、4

65、【 Single topic selection 】 According to the reading method of the instrument, it can be divided into ().（  D  ）

A、 Pointer

B、 Digital

C、 Recording

D、 All of these are

66、【 Single topic selection 】 The concept of potential ,() That's right .（  C  ）

A、 Potential is voltage

B、 The potential is absolute

C、 The potential is a relative value

D、 The potential at the reference point is not necessarily equal to zero

67、【 Judgment questions 】 In the voltage stabilizing circuit of silicon voltage stabilizing tube , The voltage stabilizing tube must be connected in series with the load .()（  ×  ）

68、【 Judgment questions 】() Generally, the resistance of insulating materials is above megohm , Therefore, the unit of megohm scale is expressed in kiloohm .（  ×  ）

69、【 Judgment questions 】() When the straight pole is equipped with a herringbone stay wire , Nor does it belong to the bearing rod .（  √  ）

70、【 Judgment questions 】 A square is a measuring tool for measuring right angles , It is also a guiding tool for drawing parallel lines and vertical lines .()（  ×  ）

71、【 Judgment questions 】() When measuring diodes , Turn the multimeter selector switch to RF100 or RF1K On file , Then use the positive and negative probes to measure the two ends of the diode according to the forward and reverse wiring respectively , At this time, it is found that there is little difference between the two readings , It means that the diode is not damaged .（  ×  ）

72、【 Judgment questions 】() After finding an electrical fire , We should put out the fire with water as soon as possible .（  ×  ）

73、【 Judgment questions 】() There are two kinds of temperature regulating electric soldering irons: automatic and manual .（  √  ）

74、【 Judgment questions 】() FET can be applied to large-scale integration 、 High switching speed 、 A circuit with a high signal frequency .（  √  ）

75、【 Judgment questions 】() The control circuit of the motor belongs to a part of the primary circuit system diagram of the motor .（  ×  ）

76、【 Judgment questions 】() The rated current of the secondary side of the current transformer is usually 5 Ann .（  √  ）

77、【 Judgment questions 】() In overhead lines , Copper aluminum alloy is widely used as conductive material , Its model designation is HL.（  √  ）

78、【 Judgment questions 】() Before welding electronic components, the lead wires of components should be bent into a certain shape in advance , Improve the shockproof and reliability of electronic equipment .（  √  ）

79、【 Judgment questions 】() The coil in high-frequency circuit usually uses bakelite with small high-frequency loss as the skeleton .（  ×  ）

80、【 Judgment questions 】() When the transistor works in the amplified state , Emission junction reverse bias , For silicon tubes, it is about 0.7v, Germanium tube is about 0.3v.（  √  ）

81、【 Judgment questions 】 The circuits used at home are all connected in parallel ()（  √  ）

82、【 Judgment questions 】() The total resistance after parallel connection is less than the resistance value of any resistance participating in parallel connection .（  √  ）

83、【 Judgment questions 】() When the conductor passes through the wall, it shall be installed through the wall pipe .（  √  ）

84、【 Judgment questions 】() The multimeter mainly has an indication part 、 Measuring circuits 、 The conversion device consists of three parts .（  √  ）

85、【 Judgment questions 】() When erecting conductors , Mechanical strength at conductor joints , It shall not be lower than... Of the original conductor strength 80%.（  ×  ）

86、【 Judgment questions 】() The safety measures to prevent electric shock during power failure include power failure 、 Electricity test 、 Installation of grounding wire 、 Hang warning signs and install barriers .（  √  ）

87、【 Judgment questions 】() The fabrication of cable head must be carried out continuously , Finish at one time .（  √  ）

88、【 Judgment questions 】() The work ticket shall be issued by the superior leaders .（  ×  ）

89、【 Judgment questions 】() The self-locking function in the forward and reverse control circuit of three-phase asynchronous motor is realized by parallel connection of the normally open auxiliary contact of the forward and reverse contactor and the normally open contact of the corresponding forward and reverse start button .（  √  ）

90、【 Judgment questions 】() Single phase motors can be divided into two categories , namely ： Capacitor starting type and capacitor running type .（  ×  ）

91、【 Judgment questions 】() Grounding device on power line , The down lead shall be galvanized steel strand , The section shall not be greater than 25mm2.（  ×  ）

92、【 Judgment questions 】() If the effective value of a voltage is 220 v , Then the maximum value of this voltage is 380 v .（  ×  ）

93、【 Judgment questions 】() The current whose magnitude and direction do not change with time is called steady DC .（  √  ）

94、【 Judgment questions 】 The transformer can change the DC voltage .()（  ×  ）

95、【 Judgment questions 】 To ensure personal safety and accuracy of measurement , Do not touch the metal part of the test rod with your hand when testing the multimeter ()（  √  ）

96、【 Judgment questions 】() The saw teeth of the saw blade cut in the forward direction , So when installing the saw blade , Keep the tip of the serration in the direction of pushing forward .（  √  ）

97、【 Judgment questions 】() Metallized paper capacitor 、 Electrolytic capacitors can be used for low frequency coupling 、 Bypass coupled electronic circuit .（  √  ）

98、【 Judgment questions 】() When accepting the switching operation command , There should be a supervisor and operator present , Accepted by the guardian .（  √  ）

99、【 Judgment questions 】() The voltage between a certain point in the electric field and the reference point is the potential at that point .（  √  ）

100、【 Judgment questions 】() The climbing Board shall be tidy after use , Hang it in a ventilated and dry place for storage .（  √  ）

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