2022 electrician (intermediate) examination question bank and electrician (intermediate) examination questions and analysis

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

Pass the safety production simulation exam at one point ： Electrician （ intermediate ） The exam question bank is a set of electricians generated in the general question bank of the one point pass of the safety production simulation exam （ intermediate ） Test questions and analysis , Pass the safety production simulation test at one o'clock （ intermediate ） Homework mobile phone synchronization practice .2022 Year electrician （ intermediate ） Exam question bank and electrician （ intermediate ） Test questions and analysis

1、【 Single topic selection 】 In a resistance series circuit , In the same time , The more resistance , Calorific value ( ).（ C ）
A、 The smaller it is
B、 It's not necessarily big
C、 The bigger it is
D、 unchanged
2、【 Single topic selection 】6KV When installing indoor terminals of PVC insulated cables , It should be away from the plastic cutting opening （） Saw steel armour at .（ B ）
A、10mm
B、30mm
C、15mm
D、45mm
3、【 Single topic selection 】 The tension pole of low-voltage overhead line needs to be punched ( ) Pull a line .（ B ）
A、1 strip
B、2 strip
C、3 strip
D、4 strip
4、【 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
5、【 Single topic selection 】LFC-10 The rated voltage ratio of type a high voltage transformer is 10000/100. For secondary winding 1000V or 2500V Megger to measure the insulation resistance , The resistance value shall not be less than () Mega ohm .（ A ）
A、1
B、2
C、3
D、0.5
6、【 Single topic selection 】 DC generator —— In DC motor speed regulation system , If the excitation flux of the generator is changed , Belong to () adjust speed .（ B ）
A、 Change the excitation flux
B、 Change armature voltage
C、 Change the supply voltage
D、 Change the magnetic pole
7、【 Single topic selection 】 a 30KW The input active power of the motor should be ().（ D ）
A、 be equal to 30KW
B、 Greater than 30KW
C、 Less than 30KW
D、 Not sure
8、【 Single topic selection 】 In terms of working principle , The AC magnetic motor expander is equivalent to ().（ D ）
A、 DC motor
B、 Two stage DC motor
C、 DC generator
D、 Two stage DC generator

9、【 Single topic selection 】 For power plants 、 The valve type arrester in the substation is installed every year () Measure the insulation resistance before the season .（ D ）
A、 In the spring
B、 In the summer
C、 autumn
D、 The thunderstorm
10、【 Single topic selection 】 During DC withstand voltage test , When the test transformer used has only one outgoing line bushing , Micro ammeter is connected in series ( ).（ A ）
A、 High voltage end
B、 Low voltage end
C、 High voltage end or low voltage end
D、 No regulations
11、【 Single topic selection 】 The main reason of zero drift in direct coupled amplifier circuit is () change .（ A ）
A、 temperature
B、 humidity
C、 voltage
D、 electric current
12、【 Single topic selection 】 DC voltmeter mainly adopts () Measuring mechanism .（ B ）
A、 Electromagnetic system
B、 Magnetoelectric system
C、 Electrostatic system
D、 Electric system
13、【 Single topic selection 】 The voltage at both ends of a lighting transmission line is 220V, The passing current is 10A,10 Heat can be generated in minutes ().（ A ）
A、6F104J
B、1F104J
C、6F103J
D、4F105J
14、【 Single topic selection 】 The nonlinear element of lightning arrester is ().（ C ）
A、 Spark gap ：
B、 Shunt resistance
C、 Valve plate
D、 shim
15、【 Single topic selection 】 One day (24 Hours ) electricity 12 degree , The power of this electric appliance is ().（ B ）
A、4.8KW
B、0.5KW
C、2Kw
D、2.4KW
16、【 Single topic selection 】FX2N Series of programmable controller counters （） Express .（ D ）
A、X
B、Y
C、T
D、C
17、【 Single topic selection 】 For oscilloscopes that are not used for a long time , At least ( ) Power on once a month .（ A ）
A、 3、 ... and
B、 5、 ... and
C、 6、 ... and
D、 Ten
18、【 Single topic selection 】 The following is about the use of multimeter ,( ) Not right .（ D ）
A、 Calibrate the mechanical zero position and electrical zero position before using the multimeter
B、 Select the gear before measuring
C、 It is forbidden to switch the range with electricity
D、 When not in use , The change-over switch should stop at ohm
19、【 Single topic selection 】 The purpose of AC motor voltage withstand test is to assess the voltage between each phase winding and between each phase winding and the casing ()（ A ）
A、 Insulation performance
B、 Insulation resistance
C、 The withstand voltage
D、 Dielectric strength of insulation
20、【 Single topic selection 】 Three phase asymmetric load star connection is used in three-phase four wire transmission system , Then... Of each phase load ( ).（ B ）
A、 The current is symmetrical
B、 Voltage symmetry
C、 voltage 、 The currents are symmetrical
D、 Voltage asymmetry
21、【 Single topic selection 】 When the transformer is used for step-down , Can output larger ().（ B ）
A、 power
B、 electric current
C、 electric energy
D、 voltage
22、【 Single topic selection 】 The quality management of the first line of production is called ()（ B ）
A、 Production site management
B、 Production site quality management
C、 Production site equipment management
D、 Production planning management
23、【 Single topic selection 】 The maximum voltage borne by the thyristor in the single-phase half wave controllable rectifier circuit is （）.（ A ）
A、1.414U2
B、0.707U2
C、U2
D、2U2
24、【 Single topic selection 】 There is a ground insulation damage at the outgoing end of a phase stator winding of three-phase asynchronous motor , The faults brought to the motor are ().（ D ）
A、 The motor stops immediately
B、 The temperature is too high and stops running
C、 Vibration and abnormal sound of motor
D、 The motor housing is charged
25、【 Single topic selection 】 If the contact resistance of the switch is measured, the following can be used （） Meter .（ B ）
A、 DC single arm bridge
B、 DC double arm bridge
C、 Megger
D、 Ohmmeter
26、【 Single topic selection 】 The action time limit of overload protection device is ( ).（ D ）
A、6S
B、7S
C、8S
D、9～10S
27、【 Single topic selection 】 The reason for the heavy gas protection action of transformer is （）.（ D ）
A、 Air enters the transformer
B、 Transformer has short circuit fault
C、 The oil level drops slowly
D、 The internal fault of the transformer produces a large amount of gas .
28、【 Single topic selection 】 Zero sequence current protection can only reflect the characteristics of single-phase grounding （）.（ C ）
A、 Zero sequence current
B、 Zero sequence voltage
C、 Zero sequence current and zero sequence voltage
D、 None of the above is true
29、【 Single topic selection 】SF6 During circuit breaker adjustment , The center distance error between phases shall not be greater than ().（ A ）
A、5mm
B、10mm
C、12mm
D、20mm
30、【 Single topic selection 】 The stay wire of the corner rod is located at the end of the corner bisector （） On .（ B ）
A、 Parallel lines
B、 Vertical line
C、30° Line
D、60° Line
31、【 Single topic selection 】 The AC voltage withstand test adopts clearance for protection , The discharge voltage of the gap shall be adjusted within the range of the test voltage ( ).（ D ）
A、80%～85%
B、90%～95%
C、100%～110%
D、115%～120%
32、【 Single topic selection 】 Rectifier DC arc welding machine has () External characteristics of .（ B ）
A、 Straight
B、 plunge
C、 rising
D、 Slightly lower
33、【 Single topic selection 】 One day （24 Hours ） electricity 12 degree , The power of this electric appliance is ().（ B ）
A、4.8KW
B、0.5KW
C、2Kw
D、2.4KW
34、【 Single topic selection 】X62W Complete electrical interlocking measures are adopted in the electrical circuit , The working sequence of spindle and worktable is ( ).（ B ）
A、 After the workbench starts , The spindle can be started
B、 After the spindle is started , The workbench starts
C、 The worktable and spindle start at the same time
D、 After the workbench moves quickly , Spindle start
35、【 Single topic selection 】X62W Complete electrical interlocking measures are adopted in the electrical circuit , The working sequence of spindle and worktable is ().（ B ）
A、 After the workbench starts , The spindle can be started
B、 After the spindle is started , The workbench starts
C、 The worktable and spindle start at the same time
D、 After the workbench moves quickly , Spindle start
36、【 Single topic selection 】 The start and stop control line of three-phase asynchronous motor is routed through the power switch 、（）、 AC contactor 、 Thermal relay 、 Button composition .（ C ）
A、 Time relay
B、 Speed relay
C、 Fuse
D、 Solenoid valve
37、【 Single topic selection 】SF₆ During circuit breaker adjustment , The center distance error between phases shall not be greater than ( ).（ A ）
A、5mm
B、10mm
C、12mm
D、20mm
38、【 Single topic selection 】 If the transformer insulation is damp , During the withstand voltage test ().（ A ）
A、 Break down the insulation
B、 The insulation can be dried due to the heating of the winding during the test , Back to normal
C、 No impact
D、 Endanger the personal safety of operators
39、【 Single topic selection 】 In case of accidental overload of oil immersed self cooling transformer 1.5 times 、 ambient temperature 20℃ when , The allowable duration is （） Hours .（ A ）
A、2
B、4
C、8
D、12
40、【 Single topic selection 】 The transformer body is mainly composed of iron core and ( ) Two parts .（ A ）
A、 winding
B、 rotor
C、 Stator
D、 Flux
41、【 Single topic selection 】 DC permanent magnet tachogenerator ().（ A ）
A、 No additional excitation power supply is required
B、 Need to add excitation power supply
C、 AC excitation voltage is required
D、 DC excitation voltage is required
42、【 Single topic selection 】 The application range of transistor contactless switch is wider than that of ordinary position switch ().（ B ）
A、 narrow
B、 wide
C、 Very small
D、 near
43、【 Single topic selection 】 When the measured resistance is less than () when , In order to eliminate the influence of grounding resistance and contact resistance , Four terminal grounding megger should be used .（ C ）
A、4Ω
B、10Ω
C、1Ω
D、2Ω
44、【 Single topic selection 】 The general working state of switching triode is ().（ D ）
A、 end
B、 Zoom in
C、 saturated
D、 Cut off and saturation
45、【 Single topic selection 】 The reason for insulation breakdown of AC motor in voltage withstand test may be ( )（ D ）
A、 The test voltage is low
B、 The test voltage is too high
C、 The test voltage is AC
D、 The motor has not been dried
46、【 Single topic selection 】 Application of detecting positive and negative phase sequence of power supply ( ) Electrical instruments .（ B ）
A、 Frequency table
B、 Phase sequence table
C、 Power factor meter
D、 Phase meter
47、【 Single topic selection 】 The following statements about the purpose of high voltage circuit breaker are correct ().（ C ）
A、 Cut off the no-load current
B、 Control breaking or switching on normal load current
C、 It can switch the normal load and remove the fault , At the same time, it undertakes the dual tasks of control and protection
D、 Make or break the no-load current of the circuit , It is forbidden to open the brake with load
48、【 Single topic selection 】 In order to improve the power factor, it is often used at both ends of inductive load （）.（ C ）
A、 Connect an inductor in series
B、 One inductor in parallel
C、 Shunt appropriate capacitors
D、 Connect a capacitor in series
49、【 Single topic selection 】 The capacity of the voltage regulator for AC voltage withstand test shall generally be the same as that of the test transformer ( ).（ C ）
A、 The former is smaller than the latter
B、 The former is far greater than the latter
C、 The former is equal to or slightly greater than the latter
D、 No regulations
50、【 Single topic selection 】 Maintenance and storage of instruments , Should not take ( ) measures .（ A ）
A、 Put it around a strong magnetic field
B、 Keep dry
C、 Wipe with cotton yarn
D、 handle gently
51、【 Single topic selection 】 The program controller can be divided into ( ) Categories: .（ C ）
A、2
B、3
C、4
D、5
52、【 Single topic selection 】 Single phase AC energy meter usually adopts () Measuring mechanism .（ D ）
A、 Electric system
B、 Electromagnetic system
C、 Electrostatic system
D、 Induction system
53、【 Single topic selection 】 After high-speed cutting of milling machine , Parking takes time , Therefore adopt () braking .（ D ）
A、 capacitance
B、 regenerate
C、 Electromagnetic holding brake
D、 Electromagnetic clutch
54、【 Single topic selection 】 The arrangement structure on the stator of three-phase AC asynchronous motor is exactly the same , Differ from each other in spatial position 120° Three phase winding with electrical angle , Connect... Respectively ( ), Then a rotating magnetic field will be generated between the air gap between the stator and the rotor .（ D ）
A、 Direct current
B、 Alternating current (ac)
C、 Pulsating DC
D、 Three phase symmetrical alternating current
55、【 Single topic selection 】 The following is about instrument maintenance ,( ) It's not true .（ D ）
A、 The pointer of the measuring instrument needs to be adjusted to zero position frequently
B、 When the instrument is not in use , It should be placed in a dry and ventilated place
C、 The instrument should be handled with care
D、 The instrument shall be placed around a strong magnetic field
56、【 Single topic selection 】 Pointer multimeter is used to measure current ( ) To expand the range .（ C ）
A、 Series shunt resistor
B、 Series voltage dividing resistor
C、 Shunt resistor
D、 Shunt voltage dividing resistor
57、【 Single topic selection 】 In the power triangle of AC circuit , power factor Cosφ＝( ).（ C ）
A、 Reactive power / Apparent power
B、 Reactive power / Active power
C、 Active power / Apparent power
D、 Reactive power / Apparent power
58、【 Single topic selection 】 The transformer gives out continuous and heavy noise when it is running “ hum ” The sound , It may be due to （） Caused by the .（ A ）
A、 Overload
B、 Poor internal contact
C、 Internal insulation breakdown
D、 Start with large capacity power equipment
59、【 Single topic selection 】 When the DC motor is reversely connected for braking , When the motor speed is close to zero , The power supply should be cut off immediately , prevent ().（ D ）
A、 The current increases
B、 Motor overload
C、 Short circuit occurs
D、 The motor rotates in the opposite direction
60、【 Single topic selection 】 The common emitter amplifier is ( ) form .（ B ）
A、 Input ＩＢ; Output ＩＥ
B、 Input ＩＢ; Output ＩＣ
C、 Input ＩＥ; Output ＩＣ
D、 Input ＩＥ; Output ＩＥ
61、【 Single topic selection 】 stay RLC In a series circuit , Apparent power Ps, Active power P, Reactive power Pqc,Pql The relationship between the four is ( ).（ C ）
A、Ps=P+Pql+Pqc
B、Ps=P+Pql-Pqc
C、Ps=P+(Pql-Pqc)
D、Ps=P+(Pql+Pqc)
62、【 Single topic selection 】 With shunt resistor FZ Type a lightning arrester when the conductance current is greater than () when , The arrester shall be shut down immediately .（ D ）
A、100mA
B、100μA
C、200μA
D、1000μA
63、【 Single topic selection 】 DC generator —— When the DC motor automatic speed regulation system regulates the speed below the rated speed and base speed , The essence of adjusting the resistance of DC generator excitation circuit is ().（ A ）
A、 Change armature voltage
B、 Change the excitation flux
C、 Change the circuit resistance
D、 Limit the starting current
64、【 Single topic selection 】 The phase voltage is () Voltage between .（ B ）
A、 Firewire and FireWire
B、 Fire line and center line
C、 Center line and ground
D、 Phase line and phase line
65、【 Single topic selection 】 The DC arc welding generator consists of ( ) constitute .（ A ）
A、 Prime mover and demagnetized DC generator
B、 Prime mover and demagnetized alternator
C、 DC motor and alternator
D、 Rectifying device and regulating device
66、【 Single topic selection 】 The electric difference connection method of AC magnetic expander is compared with the magnetic difference connection method , The electric differential connection method is used to save the control winding , It's easier to reduce power loss ( ).（ A ）
A、 superior
B、 Not superior
C、 equal
D、 Can't compare
67、【 Single topic selection 】 The tubular arrester is used to protect against atmospheric overvoltage () Insulation weakness of .（ B ）
A、 Cable route
B、 Overhead lines
C、 transformer
D、 High voltage circuit breaker
68、【 Single topic selection 】 The mechanical characteristic curve of three-phase asynchronous motor is ( ).（ B ）
A、T=f(s)
B、T=f(n)
C、u=f(I)
D、u=f(n)
69、【 Single topic selection 】 The reading is not accurate , Belong to () Measurement error .（ A ）
A、 Negligence error
B、 Accidental error
C、 System error
D、 Measurement method error
70、【 Single topic selection 】 The reactive power calculation formula of single-phase AC circuit is （）.（ B ）
A、Pq＝UICosφ
B、Pq＝UIsinφ
C、Pq＝UI
D、Pq＝I2R
71、【 Single topic selection 】 Electromagnetic slip clutch , The excitation winding of the magnetic pole is connected ( ) Conduct excitation .（ D ）
A、 Sinusoidal alternating current
B、 Non sinusoidal AC current
C、 pulse current
D、 Direct current
72、【 Single topic selection 】 The percentage of the ratio of the output power to the input power of the electric equipment is ().（ B ）
A、 power factor
B、 efficiency
C、 Apparent power
D、 Active power
73、【 Single topic selection 】 Protective grounding is used for neutral point ( ) Power supply operation mode .（ B ）
A、 Direct ground
B、 Ungrounded
C、 Grounded through resistance
D、 Grounded through inductive coil
74、【 Single topic selection 】DB-25 Type insulating oil sampling test in operation , According to the standard, the freezing point shall not be higher than ( ).（ D ）
A、—25℃
B、—10℃
C、—20℃
D、 No regulations
75、【 Single topic selection 】 Grounding device installed separately for high voltage electrical equipment , The grounding resistance shall not be greater than ().（ C ）
A、0.5Ω
B、4Ω
C、10Ω
D、20Ω
76、【 Judgment questions 】() When the synchronous generator is running , Direct current must be connected to the excitation insulator group to excite .（ √ ）
77、【 Judgment questions 】 When measuring the internal resistance of galvanometer , A bridge with high accuracy must be used to measure .（ × ）
78、【 Judgment questions 】() Rated voltage 10 KV disconnector , Conduct AC voltage withstand test after overhaul , The test voltage standard is 10 Kilovolt .（ × ）
79、【 Judgment questions 】() When the thyristor is blocked in the forward direction , There is only a small forward leakage current between anode and cathode .（ √ ）
80、【 Judgment questions 】（） The leakage current test of power cable can be carried out simultaneously with DC withstand voltage test .（ √ ）
81、【 Judgment questions 】() The calculation formula of heat generated by current is =I2T.（ √ ）
82、【 Judgment questions 】() After disconnecting the control pole , It can ensure that the thyristor is not connected and allow the positive peak voltage repeatedly added between the anode and cathode , It is called forward blocking peak voltage .（ √ ）
83、【 Judgment questions 】 The tangent value of dielectric loss angle of insulating oil is tested under power frequency voltage .（ √ ）
84、【 Judgment questions 】 Thevenin theorem is the only way to solve the current of a branch in a complex circuit .（ × ）
85、【 Judgment questions 】() Travel switch for limit , It shall be adjusted in coordination with the mechanical device , After confirming the reliable action, it can be connected to the circuit for use .（ √ ）
86、【 Judgment questions 】 Large dust and damp of DC motor is one of the main reasons for its breakdown in voltage withstand test .（ √ ）
87、【 Judgment questions 】 Programmable controller has complex logic operation function , Relay control cannot be realized .（ √ ）
88、【 Judgment questions 】() The excitation mode of DC motor can be divided into other excitation 、 Shunt excitation 、 Series excitation and compound excitation .（ √ ）
89、【 Judgment questions 】 The allowable overload value of outdoor transformer shall not exceed its rated capacity 30%.（ √ ）
90、【 Judgment questions 】() Thevenin theorem is most suitable for finding the current of a branch in a complex circuit .（ √ ）
91、【 Judgment questions 】 Arc is generated between the contacts of the switch circuit after disconnection , At this time, although the contact has been separated , However, due to the arc between the contacts , The circuit is still in the path state .（ √ ）
92、【 Judgment questions 】 In the middle 、 Regular inspection of small power transformers , If the discolored silica gel in the respiratory dryer is found to turn blue , It indicates that the discolored silica gel has failed , To be replaced or disposed of .（ × ）
93、【 Judgment questions 】（） AC voltage withstand test can effectively find dangerous concentrated defects in electrical equipment .（ √ ）
94、【 Judgment questions 】 Unidirectional half wave controllable rectifier circuit , No matter how the polarity of the input voltage changes , The polarity of its output voltage will not change .()（ √ ）
95、【 Judgment questions 】 hand over 、 Sufficient margin must be reserved for the distance between the high-voltage circuit of DC voltage withstand test and the grounding body .（ √ ）
96、【 Judgment questions 】 use 1.5 level 10V Voltmeter and 0.5 level 100V Voltmeter measurement 8V voltage , Then the former is more prepared .（ √ ）
97、【 Judgment questions 】 Apply a forward voltage to the anode and cathode of the thyristor , You can turn it on .（ × ）
98、【 Judgment questions 】 The accidental overload of the transformer will cause the temperature of the transformer to exceed the allowable value .（ √ ）
99、【 Judgment questions 】()LC Free oscillation frequency of the loop fo=2πTLC（ √ ）
100、【 Judgment questions 】35KV The grounding resistance of the above overhead lines with lightning wires has nothing to do with the size of soil resistivity and grounding form .（ × ）
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