Question bank source: Safety production mock test, one-stop public account applet
Electrician (Advanced) is a set of electrician (advanced) mock exams generated in the general question bank of the safety production mock test. 2024 Electrician (Advanced) and Electrician (Advanced) mock exams
1. [Multiple Choice] ( ) is not the effect of differential negative feedback. （ B ）
A. Reduce the amount of overshoot
B. Improve follow-up
C. Improve anti-disturbance performance
D. Improve the quality of the system
2. [Multiple Choice] 17 is converted into binary numbers ( ). （ A ）
A、10001
B、10101
C、10111
D、10010
3. [Multiple Choice] The insulation resistance of the two poles of 1kV and above phase-shifting capacitors to the ground is usually greater than how much ( ) at room temperature. （ C ）
A、1000MΩ
B、3000MΩ
C、5000MΩ
D、10000MΩ
4. [Multiple choice question] The technical performance of the 35KV oil switch, taking the rated capacity of 1000 megavolt-ampere as an example: how many times to disconnect the 1000 megavolt-ampere load, the switch is not overhauled ( ). （ C ）
A、8次
B, 16 times
C. 4 times
D. 2 times
5. [Multiple choice] After the overhaul of the 35KV disconnector, the AC withstand voltage test voltage standard is ( ) KV. （ D ）
A、24
B、32
C、55
D、95
6. [Multiple choice question] The tripping "dead center" distance adjustment standard of CD10~I electric operating mechanism is ( ). （ A ）
A、0.5~1mm
B、1~1.5mm
C、1~2mm
D、1~2.5mm
7. [Multiple choice question] The distance between the contacts of the polarization relay of LLG~1 power relay should not be less than how much ( ). （ B ）
A、0.1mm
B、0.3mm
C、0.5mm
D、0.7mm
8. [Multiple choice question] The return coefficient of the polarization relay of LLG~1 power relay is not less than ( ). （ A ）
A、0.5
B、0.7
C、0.9
D、1.2
9. [Multiple choice question] The oil injection amount necessary for the opening and closing operation of SN10~10 type oil-less circuit breaker shall not be less than ( )Kg. （ B ）
A、0.5
B、1
C、2
D、2.5
10. [Multiple Choice] An NPN type transistor, UE=8V, UB=0.7V, UC=12V, it must work in ( ). （ C ）
A. Magnification area
B. Saturation zone
C. Cut-off area
D. Unsure
11. [Multiple choice] The three-terminal integrated voltage regulator is equipped with ( ) and other circuits, which is convenient and reliable to use. （ D ）
A. Overcurrent protection
B. Chip overheating protection
C. Adjust the overload protection of the tube
D. All of the above statements are correct
12. [Multiple choice] The following ( ) is the unit of magnetic field strength. （ C ）
A. Voltammetry
B. Ann
C, amp/m
D. Enjoy
13. [Multiple Choice] Which of the following triode amplification circuit analysis methods is wrong ( ). （ B ）
A. Approximate calculation method
B. Taxonomy
C. Graphical method
D. Equivalent circuit method
14. [Multiple choice question] The following characteristics of steam turbine generators are wrong ( ). （ C ）
A. High rotational speed
B. Small diameter and long length
C. The rotor is a convex pole type
D. Horizontal installation of the whole machine
15. [Multiple choice question] Which of the following places has the same magnetic induction intensity at each point ( ). （ B ）
A. Points of the same longitude line of the earth
B. Points of the Earth's line of the same latitude
C. Around the U-shaped magnetic field
D. Around the bar magnetic field
16. [Multiple choice question] The following are the advantages of capacitive feedback oscillators ( ). （ C ）
A. Large impedance to higher harmonics
B. Output waveform difference
C. High oscillation frequency
D. Narrow frequency range
17. [Multiple choice question] The μr of ( ) in the following materials is <1. （ C ）
A、铁
B. Air
C. Copper
D. Nickel
18. [Multiple choice question] What does not belong to the basic link in the automatic control system is ( ). （ D ）
A. Feedback link, amplification link
B. Compensation link, stability link
C. Given link
D. Execution
19. [Multiple Choice] and the truth table ( ) of the gate circuit are correct. （ D ）
A、1
B、11
C、111
D、1111
20. [Multiple Choice] The truth table of the NAND gate circuit is correct ( ). （ D ）
A、0000
B、0010
C、0110
D、1110
21. [Multiple Choice] Why can diodes be used as switches ( ). （ A ）
A. The diode has unidirectional conductivity
B. Do not change the shape of the input pulse
C. The forward current is greater than the reverse current
D. It is related to the load
22. [Multiple choice question] After the first overlap of the secondary reclosing device is unsuccessful, the second reclosing shall be carried out after a time of not less than ( ). （ C ）
A、3~5S
B、5~10S
C、10~15S
D、25~35S
23. [Multiple choice] What is the function of the transformer ( ). （ A ）
A. Variable high current is small current, variable high voltage is low voltage
B. It is convenient for centralized management and remote control
C. The secondary wiring is not limited by one time
D. The secondary side of the transformer is grounded to ensure personal safety
24. [Multiple choice question] The minimum insulation resistance of a low-voltage cable is not less than how much can it be put into operation ( ). （ B ）
A、0.1MΩ
B、0.5MΩ
C、5MΩ
D、10MΩ
25. [Multiple Choice] Regarding the characteristics of Class B power amplifiers, the correct description is: the static working point of the power amplifier tube ( ). （ C ）
A. Select the midpoint of the AC load line
B. Move along the AC load line to reduce the static collector current
C. Continue to move down along the AC load line so that the static collector current is equal to zero
D. Select above the AC load line
26. [Multiple Choice] The main basis for analyzing and calculating complex circuits is ( ). （ C ）
A. Ohm's law
B. Kirchhoff's law
C、欧姆定律和基尔霍夫定律
D. Additive principle
27. [Multiple Choice] The signal input mode of the adder input terminal is the following ( ). （ B ）
A. Non-inverting input
B. Inverted input
C. Double-ended input
D. Neither
28. [Multiple Choice] The maximum conduction angle of the single-phase half-wave controllable rectifier circuit is ( ). （ D ）
A、90°
B、120°
C、150°
D、180°
29. [Multiple Choice] In the case of inductive load, if the average current flowing through the thyristor in one cycle is equal to the current flowing through the freewheeling diode, the conduction angle of the thyristor should be ( ). （ A ）
A、180°
B、120°
C、90°
D、60°
30. [Multiple Choice] Single-phase bridge semi-controlled rectifier can use up to ( ) rectifier diodes. （ D ）
A、1
B、2
C、3
D、4
31. [Multiple choice question] The biggest feature of the single junction transistor trigger is ( ). （ B ）
A. The steepness of the output pulse front is good
B. Large power gain and good temperature compensation performance
C. The pulse width can be easily set
D. The trigger pulse is stable
32. [Multiple Choice] The inverting input operational amplifier is actually a circuit with ( ). （ D ）
A. Deep voltage series positive feedback
B. Parallel positive feedback of deep voltage
C. Deep current series negative feedback
D. Deep voltage parallel negative feedback
33. [Multiple choice question] What is the relationship between the no-load loss of the transformer ( ). （ D ）
A. It is related to the size of the load
B. It is related to the nature of the load
C. It is related to the level of voltage
D. It is related to frequency and magnetic flux density amplitude
34. [Multiple choice question] The trial operation of the transformer requires the full voltage closing impact test ( ) times to test the insulation of the end of the transformer. （ C ）
A、3
B、4
C、5
D、6
35. [Multiple choice question] The insulation resistance of the newly installed secondary wiring circuit of the substation should be measured. （ D ）
A. Wire to ground
B. Between the cable cores
C. Between adjacent conductors
D. The above three
36. [Multiple choice question] When the secondary line of power transformation and distribution control is laid on the concrete or brick structure, the distance between the wire and the concrete surface is generally ( ). （ A ）
A、10mm
B、20mm
C、50mm
D、100mm
37. [Multiple Choice] The phase shift range of the thyristor resistance and capacitance phase-shifting bridge trigger circuit at no load is ( ) radian. （ C ）
A、π/2
B、(2/3)π
C、π
D、(3/2)π
38. [Multiple Choice] In a bistable circuit, the condition for flipping its working state is ( ). （ D ）
A. The polarity of the trigger pulse should make the saturated tube exit the saturation zone or make the cut-off tube exit the cut-off zone
B. The amplitude of the trigger pulse should be large enough
C、触发脉冲的宽度要足够宽
D、含A、B、C
39. [Multiple choice question] When overhauling the radio, if there are suspicious components, you can use ( ), at this time, if the fault is eliminated, it proves that the suspected components are indeed broken and should be replaced. （ A ）
A. Try it instead of a similar component in good condition
B. Appropriate instrument measurement waveform
C. Multimeter measures voltage
D. Multimeter to measure the current
40. [Multiple choice] In the case of the same specification, which of the following materials has the largest magnetic resistance ( ). （ D ）
A、铁
B. Nickel
C. Cobalt
D. Copper
41. [Multiple Choice] In linear circuits, the superposition principle is not applicable to the calculation of ( ). （ D ）
A. Voltage
B. Current
C. Electromotive force
D. Power
42. [Multiple Choice] In a uniform magnetic field, the conductor is most stressed when the energized straight conductor is at an angle to the magnetic field line. （ C ）
A、0°
B、180°
C、90°
D、45°
43. [Multiple Choice] The basic microcomputer control system should be as follows ( ). （ A ）
A. Microcomputer, sensing element, actuator
B. Microcomputer, conversion interface, and actuator
C. Microcomputer, sensing element, indicating instrument
D. Microcomputer, signal interface, indication instrument
44. [Multiple choice] The output signal of the multivibrator is ( ). （ C ）
A、正弦波
B. Zigzag waves
C. Rectangular wave
D. Pulse
45. [Multiple Choice] If the collector current of the transistor is greater than its maximum allowable current, the transistor ( ). （ A ）
A. Reduced amplification ability
B. Breakdown
C. It must be overheated or even burned out
D. Working normally
46. [Multiple Choice] When installing the watt-hour meter, the center of the meter should be installed from the ground ( ). （ C ）
A、1~1.3m
B、1.3~1.5m
C、1.5~1.8m
D. Higher than 2m
47. [Multiple choice question] For transformers with a capacity of less than 100KV, the high-voltage fuse can be selected according to the rated current of the high-voltage side. （ B ）
A、1.5~2倍
B, 2~3 times
C, 3~5 times
D, 5~7 times
48. [Multiple Choice] When the transformer is filled with oil or refilled, air may enter the transformer shell, what should be done to prevent the transformer from heavy gas action ( ). （ C ）
A. Lift the heavy gas protection
B. Lift the light gas protection
C. Switch the heavy gas protection to the signal
D. Remove all heavy and light gas protection
49. [Multiple choice question] When the synchronous motor runs with the rated load under the rated voltage, the excitation current can be adjusted to change ( ). （ A ）
A. Enter the reactive power of the motor
B. Motor output torque
C. Enter the active power of the motor
D. The speed of the synchronous motor
50. [Multiple Choice] When the microcomputer control system detects and controls the state of the circuit, the input and output of the host is the ( ) signal. （ C ）
A. Analog quantity
B. Digital
C. Switching quantity
D, Sine Wave
51. [Multiple Choice] Micro Computing. The safety production simulation exam is easy to understand. The machine is composed of ( ) as the core, plus memory, input and output interfaces, system lines, etc. （ D ）
A. Combinator
B. Controller
C. Registers
D. Microprocessor
52. [Multiple choice question] The contact resistance of the primary isolation contact of the handcart-type high-voltage switchgear should not be greater than how much ( ). （ A ）
A、100μΩ
B、1000μΩ
C、1Ω
D、4Ω
53. [Multiple choice question] commutation pieces are commonly used as materials. （ C ）
A. Silver and copper
B. Chromium copper
C. Cold-drawn trapezoidal copper bar
D. Zirconium copper
54. [Multiple Choice] What method should be used to change the oscillation frequency of the trigger circuit of the single junction transistor ( ). （ C ）
A. Emitter resistance
B. Power supply voltage
C. Oscillation capacitor
D. Current of single junction transistor
55. [Multiple Choice] In the digital circuit, the ( ) level represents the two working states of the circuit. （ C ）
A, 1 and A
B, A, and 0
C, 1 and 0
D, 3.5 and 0.3
56. [Multiple choice question] The characteristics of digital circuits are ( ). （ D ）
A. The input is continuous, and the output signal is discrete
B. The input signal is discrete, and the output is continuous
C. The input and output signals are continuous
D. The input and output signals are discrete
57. [Multiple Choice] The trigger circuit of the body tube has the characteristics of ( ). （ B ）
A. The output pulse width is narrow and the leading edge is steep
B. The output pulse width is wide and the leading edge is steep
C、输出脉冲宽度窄，前沿较平缓
D. The output pulse width is wide and the leading edge is relatively gentle
58. [Multiple Choice] Text: The difference between the maximum and minimum capacitance values of the power compensation capacitor bank installation should not exceed the rated value ( ). （ C ）
A、2%
B、3%
C、5%
D、8%
59. [Multiple choice] The oil level in the oil tank of the oil circuit breaker should not be too high or too low, and there must be a buffer space for the fuel tank ( ). （ C ）
A、5~10%
B、10～20%
C、20～30%
D、40～50%
60. [Multiple choice question] The bearing grease of the motor of the rolling bearing should be replaced with new oil after the longest ( ) hour of operation. （ D ）
A、1000~1500
B、1500～2000
C、2000～2500
D、2500～3000
61. [Multiple Choice] How to eliminate the repeated short-term operation of the thermal relay and the excessive number of operations ( ). （ B ）
A. Suitable thermal relay with returnable time coefficient
B. Reasonable selection of thermal relays
C. Select a special thermal relay with anti-vibration device
D. Replace the thermal relay suitable for working conditions
62. [Multiple Choice] () can maintain the original flavor of raw materials, and has the characteristics of freshness, smoothness, deliciousness and halogen. （ C ）
A. Cooked salty filling
B. Salty filling
C. Raw and salty filling
D. Vegetable filling
63. [Multiple choice question] The high-frequency channel of the power line is mainly composed of ( ). （ D ）
A. Power lines, high-frequency obstructors, high-frequency cables, carriers
B. Power lines, high-frequency obstructors, high-frequency cables
C. Power lines, high-frequency blockers, combined filters, high-frequency cables, carriers
D. Power lines, high-frequency blockers, coupling capacitors, bonding filters, high-frequency cables, carriers
64. [Multiple choice question] The capacity of the capacitor bank between the three phases should be balanced, and its error should not exceed the total capacity of one phase ( ). （ C ）
A、1%
B、2%
C、5%
D、10%
65. [Multiple choice question] The components of DC generators that need to be maintained frequently are ( ). （ D ）
A. Armature winding
B. Excitation winding
C. Bearing
D. Commutator and brush
66. [Multiple Choice] The path through which the magnetic field lines are concentrated is called ( ). （ B ）
A. Magnetic flux
B. Magnetic circuit
C. Magnetic density
D. Magnetic field
67. [Multiple Choice] The strength of the magnetic field and the current in the conductor ( ) • The safety production simulation test is easy to understand. （ A ）
A. The size is proportional
B. The square is proportional
C. The size is inversely proportional
D. Size is irrelevant
68. [Multiple Choice] Magnetic circuit ( ) state. （ A ）
A. There is no open circuit
B. There is an open circuit
C. There is a short circuit
D. Yes, exactly the same as the circuit
69. [Multiple choice question] The rolling bearing with unqualified clearance after wear should be ( ). （ B ）
A. Reuse after repair
B. Replacement
C. Repair the bearing seat
D. Repair the journal
70. [Multiple choice] Which of the following factors is related to the self-inductance coefficient of the coil ( ). （ C ）
A. The direction of the current through the coil
B. Ambient temperature
C. Geometric dimensions of the coil
D. The length of the power-on time
71. [Multiple choice question] The basis for the preparation of the construction plan is ( ). （ D ）
A. Overhead line construction design scheme
B. Procedures and standards
C. Construction period
D. The above three
72. [Multiple Choice] The direction of the force on the energized conductor in the magnetic field can be determined by ( ). （ A ）
A. The left-handed rule
B. The right-hand rule
C. Ampere's rule
D. Lenz's law
73. [Multiple Choice] If the linkage shaft needs to be extended during the installation of the isolation switch, a bearing bracket should be set at the end point ( ) mm of the extension shaft. （ B ）
A、50
B、100
C、150
D、200
74. [Multiple Choice] The biggest feature of the integrated operational amplifier is ( ). （ D ）
A. The open-loop gain is large and the volume is small
B. The open-loop gain is very large, and the input impedance is very small
C. The open-loop gain is large and the output impedance is high
D. The open-loop gain is large, the input impedance is high, and the output impedance is small
75. [Multiple choice question] When the high-voltage motor is installed with an under-voltage protection device, the setting time limit of the important motor shall be taken ( ). （ D ）
A、0.5S
B、0.6~1.0S
C、5S
D、6~10S
76. [Multiple choice question] The high-voltage electroscope should be ( ) for a withstand voltage test. （ B ）
A. 3 months
B. 6 months
C. 1 year
D. Three years
77. [True or False] The DC withstand voltage test voltage standard of 10KV oil-impregnated paper insulated power cable is: 5 times the rated voltage of the cable. （ √ ）
78. [True or False] TTL and NAND gate circuits are fast in switching. （ √ ）
79. [True or False] According to the conventional construction arrangement, the installation of the pump in the pump room is usually at the end of the schedule. （ × ）
80. [True or False] Generally, grounding conductors are welded to each other. The lap length of the flat iron to the angle bar should be less than twice the width. （ × ）
81. [True or False] Controllable "Safety Production Mock Exam One-point" Silicon can be composed of two transistors. （ × ）
82. [True or False] Quota time refers to the consumption of man-hours necessary for workers to complete a certain job. （ √ ）
83. [True or False] For disconnectors of 35KV and below, the difference between the front and back of each phase shall not be greater than 5mm when the three-phase knife switch is closed at the same time. （ × ）
84. [True or False] For general small and medium-sized DC motors, copper-containing graphite brushes with small contact voltage drop should be selected. （ × ）
85. [True or False] The analog sampling of the microcomputer monitoring system is taken from the output standard signal of various converters. （ √ ）
86. [True or False] There must be an integral regulator in the non-static adjustment system. （ √ ）
87. [True or False] When the transistor is saturated, UCe ≈0, and the resistance is very small, which is equivalent to the opening and closing. （ √ ）
88. [True or False] The output pulse width of the transistor trigger circuit is wide, the leading edge is steep, and the reliability is high. （ × ）
89. [True or False] The construction organization of overhead lines should include pole position measurement, digging pits, arranging poles, assembling poles, standing poles, and erecting lines. （ √ ）
90. [True or False] The steam turbine generator in a thermal power plant is generally made into a four-pole stable pole type. （ × ）
91. [True or False] The starting current of the current quick-break protection of the power line is set according to the maximum short-circuit current that escapes the end of the protected line. （ √ ）
92. [True or False] The high-frequency channel of the power line is mainly composed of three parts: the power line, the high-frequency blocker, and the high-frequency cable. （ × ）
93. [True or False] The shell of the voltage transformer must be properly grounded when it is installed. （ √ ）
94. [True or False] The voltage measurement method is a method to find fault points by measuring the key voltage (or potential) magnitude and comparing it with the normal value when the equipment or circuit is energized. （ √ ）
95. [True or False] Electromagnets are made according to the characteristics and principles of the magnetic effect of electric current and the attraction of iron by magnetic energy. （ √ ）
96. [True or False] The resistance measurement method is a method to judge the fault of the circuit by measuring the resistance value of the components in the circuit when the circuit is not energized. （ √ ）
97. [True or False] If the vacuum circuit breaker is closed and closed, it is found that the dead center has not been passed because the coupling distance of the switch is too small, and the corresponding screw should be adjusted to make the switch pass the dead center. （ √ ）
98. [True or False] The unit of magnetic flux is Weber. （ √ ）
99. [True or False] The trigger circuit of the resistor-capacitance phase-shifting bridge uses the characteristics of the voltage of the capacitor and the resistor to achieve phase shift by 90° in phase. （ √ ）
100. [True or False] The DC resistance of the conductive circuit of the high-voltage circuit breaker is generally greater than 1Ω, and the DC single-arm bridge should generally be used when measuring with the bridge method. （ × ）
Support precision electrician (advanced) exam questions in all regions of the country, support safety qualification certificate, special operation certificate, vocational skill appraisal and other types of work question bank exercises.