question bank source: Production Safety Simulation Examination Yitong Official Account Mini Program
2022 Electrician (Intermediate) Theoretical Question Bank is the Electrician (Intermediate) Practice Question Theory Knowledge Examination Question Bank! The 2022 Electrician (Intermediate) Special Homework Certificate Examination Question Bank and Answers are compiled based on the latest textbooks of Electrician (Intermediate). The electrician (intermediate) test paper passes the production safety simulation test and improves the pass rate.
1. [Single choice question] () and above voltage power network adopts the neutral point direct grounding method. (A)
A, 220KV
B, 220V
C, 1000V
D, 10000V
2, [Single choice question] After the overhaul of the 10KVFS lightning arrester, the power frequency discharge voltage range should be ()KV. (C)
A, 9～11
B, 16～19
C, 26～31
D, 23～33
3, [Single choice question] FN4-10 type vacuum load switch is a three-phase indoor high-voltage electrical appliance equipment. When performing AC voltage withstand test in the factory, AC voltage withstand test standard voltage () kV should be selected. (A)
A, 42
B, 20
C, 15
D, 10
4, [Single choice question] KP20-10 means that the static forward average current of a normal reverse blocking thyristor is (). (A)
A, 20A
B, 2000A
C, 10A
D, 10000A
5, [Single choice question] The forward and reverse control of the hydraulic pump motor and grinding wheel lifting motor of the M7120 grinder can be achieved using ( ). (B )
A, jog
B, jog interlock
C, self-lock
D, interlock
6, [Single choice question] Commonly used () braking of T68 horizontal boring machine. (A )
A, reverse
B, energy consumption
C, electromagnetic clutch
D, electromagnetic brake
7, [Single choice question] A magnetoelectric system measurement mechanism with a full bias current of 500μA and an internal resistance of 200Ω is to make a 30V range voltmeter , and an additional resistor of ()Ω should be connected in series. (B)
A, 60000
B, 59800
C, 300
D, 59500
8, [Single choice question] Generally, multimeter can directly measure () physical quantity. (D)
A, active power
B, reactive power
C, electrical energy
D, audio level
9, [Single choice question] When the three synchronous motor uses energy consumption braking, the DC excitation of the rotor excitation winding is maintained after the power is disconnected, and the synchronous motor becomes the armature short-connected by the external resistor ( ). (C)
A, asynchronous motor
B, asynchronous generator
C, synchronous motor
D, synchronous motor
10, [Single choice question] The phase current in the three symmetrical circuit is ahead of the corresponding line current (). (D)
A, 90°
B, 180°
C, 45°
D, 30°
11, [Single choice question] When three-phase asynchronous motor reverse braking, the symmetrical brake resistor connection method can limit the braking torque while also limit ( ) ( A )
A, brake current
B, start current
C, brake voltage
D, start voltage
12, [Single choice question] When a three-phase asynchronous motor is running under a rated working state, s is about () for small and medium-sized asynchronous motor . (D)
A, 1
B, 0
C, 0.004~0.007
D, 0.04~0.07
13, [Single choice question] In order to ensure that the relay contacts maintain good contact after wear, the over-range must be maintained at greater than or equal to ( ) millimeters during maintenance.(C)
A, 1.5
B, 0.8
C, 0.5
D, 1
14, [Single choice question] The AC voltage withstand voltage test stipulates that the test voltage is generally not greater than ( ) of the factory test voltage value. (D)
A, 0.7
B, 0.75
C, 0.8
D, 0.85
15, [Single choice question] Commutation windings of interchange motor expander and ( ) ( A )
A, armature winding parallel
B, armature winding parallel
C, control winding series
D, control winding parallel
16, [Single choice question] The accuracy is 0.5 level, and the maximum relative error of ammeter with a range of 100A when measuring 8A current is (). (C)
A, ±0.5%
B, ±0.625%
C, ±6.25%
D, ±8%
17, [Single choice question] The model of transistor power relay in is (). (B)
A, LG-11
B, BG4, BG5
C, GG-11
D, LG-11 and BG4
18, [Single choice question] The maximum voltage that the thyristor bears in a single-phase half-wave controllable rectifier circuit is (). (A)
A, 1.414U2
B, 0.707U2
C, U2
D, 2U2
19, [Single choice question] When the single-phase bridge controllable rectifier circuit is electrically inductive load , the phase shift range of the control angle α is (). (C)
A, 0~360°
B, 0~270°
C, 0~90°
D, 0~180°
20, [Single choice question] The average value of single-phase bridge rectifying pulsating DC voltage is (). (B)
A, 0.45U2
B, 0.9U2
C, 1.17U2
D, 2.45U2
21, [Single choice question] One-arm bridge can measure ( ). (B)
A, transformer ratio
B, voltmeter buck resistance
C, dry battery internal resistance
D, switch contact resistance
22, [Single choice question] Single-arm bridge is suitable for measuring resistance of ( ). (B)
A,
B, 1~100KΩ
C, 100KΩ~1MΩ
D, 1MΩ or above
23, [Single choice question] The reason why the transformer weighs gas protection action is (). (D)
A, air enters the transformer
B, transformer short circuit failure
C, oil surface slowly drops
D, transformer internal fault generates a large amount of gas.
24. [Single choice question] When the transformer is used for step-down, it can output a larger (). (B)
A, power
B, current
C, electrical energy
D, voltage
25, [Single choice question] When setting up a double loop or multiple loops on the same pole, the vertical distance between crossing (high voltage and high voltage linear poles) of each layer should not ( )mm. (C)
A, less than 600
B, greater than 600
C, less than 800
D, size 800
26, [Single choice question] In automatic control systems, servo motors are often used as ( ). (C)
A, speed measurement element
B, correction element
C, actuator element
D, signal element
27, [Single choice question] The total amplification factor of a multi-stage amplification circuit is () of the amplification factor of each level. (C)
A,
B, difference
C, quarantine
D, quotient
28, [Single choice question] When installing low-voltage switch and its operating mechanism, the center of the operating handle is generally ( ) mm from the ground.(C)
A, 500~800
B, 1000~1200
C, 1200~1500
D, 1500~2000
29, [Single choice question] The normal overload value of an indoor transformer shall not exceed ( ) of its rated capacity of . (B)
A, 0.05
B, 0.2
C, 0.4
D, 0.5
30, [Single choice question] For M7475B type grinder, the movement of the workbench is controlled by ( ). (B)
A, jog
B, jog interlock
C, self-lock
D, interlock
31, [Single choice question] For small DC motors without commutation pole , the constant load rotates in one direction. In order to improve commutation, the brush can be turned along the armature from the geometric neutral surface . (B)
A, move β angle
B, move β angle
C, move forward 90
D, move backward to the main magnetic pole axis
32, [Single choice question] After performing an AC voltage withstand test on current transformer , if the subject passes the test, the test should be evenly reduced to ( )% of the voltage test value within 5 seconds. After the voltage reaches zero, open the knife switch . (D)
A, 10
B, 40
C, 50
D, 25
33, [Single choice question] After the AC voltage withstand test of the current transformer, if the test sample passes, the test should be evenly reduced to ( )% of the voltage test value within 5 seconds. After the voltage reaches zero, the blade switch should be opened. (D )
A, 10
B, 40
C, 50
D, 25
34, [Single choice question] For winding asynchronous motor , the ( ) method is generally used to adjust its speed. (C)
A, change the power supply frequency
B, change the magnetic pole logarithm
C, change the resistance in the rotor circuit
D, change the slip rate
35, [Single choice question] The differential amplifier circuit is designed to overcome (). (D)
A, cutoff distortion
B, saturation distortion
C, crossover distortion
D, zero point drift
36, [Single choice question] A dry battery with electromotive force of 1.5V is directly connected to both ends of a silicon diode in a forward connection method, and the tube (). (D)
A, current is zero
B, current is basically normal
C, breakdown
D, burned
37, [Single choice question] The core of the magnetic saturation reactor of the rectified DC welding machine is formed by a () shaped core. (D)
A, one "port"
B, three "ports"
C, one "day"
D, three "day"
38, [Single choice question] The application range of transistor contactless switch is more () than that of ordinary position switch . (B)
A, narrow
B, broad
C, extremely small
D, close to
39, [Single choice question] When mapping the wiring diagram of electrical control circuits of machine tool electrical equipment based on actual measurement and measurement, it should be drawn according to ( ). (D)
A, actual size
B, larger than actual size
C, smaller than actual size
D, a certain proportion
40, [Single choice question] The rotor of steam turbine generator is generally made into a hidden level, using (). (B)
A, good magnetic conductivity silicon steel sheets are superimposed to form
B, high-temperature alloy steel with good magnetic conductivity is plated into
C, 1~1.5 mm thick steel sheets are punched and stacked into
D, whole cast steel or forged steel made into
41, [Single choice question] Speed test generators are often used as () components in automatic control systems and computing devices.(C)
A, power supply
B, load
C, solution
D, amplification
42, [Single choice question] welding rod security · security production simulation Exam One point pass · Temperature cylinder is divided into ( ) types. (B)
A, 2
B, 3
C, 4
D, 5
43, [Single choice question] When using a multimeter to test unidirectional thyristor , the forward and reverse resistance between A-K poles should (). (B)
A, not big
B, all big
C, all small
D, one small one large
44, [Single choice question] After bridge is used, the galvanometer lock should be locked to prevent ( ). (C)
A, error of bridge
B, damage bridge balance
C, vibration galvanometer
D during moving
D, bridge sensitivity reduction
45, [Single choice question] The common unit of electricity is (). (D)
A, watt
B, kilowatt
C, megawatt
D, kilowatt 2-hour
46, [Single choice question] DC generator— DC motor automatic speed regulation system adjusts the resistance of the DC motor excitation circuit above the base speed (). (B)
A, change the armature voltage
B, change the excitation flux
C, change the circuit resistance
D, limit the starting current
47, [Single choice question] The direct starting current of a DC motor can reach ( ) times the rated current . (A)
A, 10~20 (should be controlled 1.5~2.5 times)
B, 20~40
C, 5~10
D, 1~5
48, [Single choice question] The phase voltage is the voltage between ( ). (B)
A, live line and live line
B, live line and midline
C, midline and ground
D, phase line and phase line
49, [Single choice question] The expression that conforms to the logical relationship of "or" is (). (B)
A, 110
B, 1+1=1
C, 1+1=10
D, 1+1=2
50, [Single choice question] In a pure capacitance sinusoidal AC circuit, when increasing the power supply frequency, other conditions remain unchanged, and the current in the circuit will (). (A)
A, enlarge
B, reduce
C, unchanged
D, increase or decrease
51, [Single choice question] In the insulating oil quality analysis test project, use ( ) to test impurity indicators. (B)
A, national standard method
B, appearance visual method
C, YS method
D, GB and Ys method
52, [Single choice question] If you measure the switch contact resistance, you can use the following () instrument. (B)
A, DC single-arm bridge
B, DC double-arm bridge
C, megohmmeter
D, ohmmeter
53, [Single choice question] If you want to make the dots in the screen, you should adjust the () knob of the oscilloscope . (C)
A, X-axis displacement
B, Y-axis displacement
C, X-axis displacement and Y-axis displacement
D, focus
54, [Single choice question] 6KV lightning arrester with split resistance, the test voltage for measuring conductance current is () KV. (B)
A, 4
B, 6
C, 10
D, 20
55, [Single choice question] When adjusting the contacts of high-voltage switches, use a ( ) gauge to check the pressure on the contact surface of the contact. (B)
A, 0.04mm×10mm
B, 0.05mm×10mm
C, 0.06mm×10mm
D, random
56, [Single choice question] The operation time limit of the overload protection device is ().(D)
A, 6S
B, 7S
C, 8S
D, 9~10S
57, [Single choice question] When performing transformer withstand voltage test , if there is no breakdown phenomenon in the test, the transformer test voltage must be uniformly reduced, and reduce it to ( )% or less of the test voltage within about 5 seconds, and the power supply is cut off. (D)
A, 55
B, 15
C, 45
D, 25
58, [Single choice question] Which () amplifier circuit is used to have the inverted phase effect. (B)
A, common collector
B, common emitter
C, common base
D, common gate
59, [Single choice question] The installation of lightning protection grounding device should ensure that it is safe to pass the production simulation test and the grounding resistance does not exceed (). (A)
A, 4Ω
B, 8Ω
C, 20Ω
D, 40Ω
60, [Single choice question] The resistor with a resistance value of 5Ω is connected in series with a capacitor with a capacitance reactance of 8Ω and is connected in AC circuit , and the power factor is ( ) ( A )
A, 0.6
B, 0.8
C, 0.5
D, 0.3
61, [Single choice question] The resistor with a resistance value of 6 ohms and the capacitor with a capacitance reactance of 8 ohms are connected in series and the capacitor with a capacitance reactance of 8 ohms are connected in an AC circuit, with a power factor of (). (B)
A, 0.5
B, 0.6
C, 0.8
D, 0.3
62, [Single choice question] zero-sequence current protection can only reflect the unique () when single-phase grounding is connected. ‘Safe Production Simulation Exam One-Time Pass’ (C)
A, Zero-Sequence Current
B, zero-Sequence Voltage
C, zero-Sequence Current and zero-Sequence Voltage
D, the above statements are not correct
63, [Single Choice Question] Three bulbs with rated voltages of 220V are connected in series in a 220V power supply, and their heat generation is arranged from large to small (). (B )
A, 100W, 60W, 40W
B, 40W, 60W, 100W
C, 100W, 40W, 60W, 60W
D, 60W, 100W, 40W
64. [Single choice question] When high pressure and high pressure are mounted on the same rod, the cross-section of the corner or branch should be ( )mm. (C)
A, 300
B, 450
C, 600
D, 800
65, [Multiple choice question] According to the principle of one post, two responsibilities, which of the following departments in construction enterprises bear the responsibility for production safety (). (ABCDE)
A, production planning department
B, labor and personnel department
C, education and training department
D, finance department
E, fire protection department
66, [Multiple choice question] () When three-phase transformers are connected, the three-phase transformers with Y and d connection methods can be connected into a group number (×)
67, [Multiple choice question] () The forward and reverse control line of the three-phase asynchronous motor, and the contactor interlocking is the most reliable first. (×)
68. [Multiple choice question] () After the rotor of a three-phase asynchronous motor rotates, an electromotive force and current are induced in the rotor, and its frequency f2=sf1. (√)
69. [Multiple choice question] () When a three-phase load is connected in a star shape, regardless of whether the load is symmetrical or not, the line current must be equal to the phase current. (√)
70. [Multiple choice question] () In order to ensure and strengthen the power supply quality and safe operation of the power grid, the load must be controlled and adjusted. (√)
71. [Multiple choice question] () The characteristic of an AC arc is that the current extinguishes when it passes through zero point, and continues to appear in the next half wave after reigniting. (√)
72. [Multiple choice question] () In an AC circuit, reactive power is the average value of instantaneous power. (×)
73. [Multiple choice question] () The megohmmeter is composed of an electromagnetic system ratio meter, a hand-crank DC generator and a measurement circuit.(×)
74. [Judgement Question] () In a single-phase AC circuit, the calculation formula for reactive power is Pg=UIs "Safe Production Simulation Test" inφ. (√)
75. [Judgement Question] () After disconnecting the control electrode, it can ensure that the thyristor does not conduct and allows repeated forward peak voltage between the anode and the cathode, which is called the forward blocking peak voltage. (√)
76. [Judgement Question] () The larger the on-state average voltage of the thyristor, the better. (× )
77. [Multiple choice question] () The effective value, frequency, and initial phase of sine alternating current can be obtained from algebraic formula using symbolic method. (× )
78. [Multiple choice question] () The two necessary conditions for establishing the potential of by the DC synergistic generator are: ① The main magnetic stage must have a multiplication magnet ② The direction of the flux generated by the excitation current must be opposite to the multiplication magnet. (×)
79. [Multiple choice question] () DC ammeters usually use electromagnetic measurement mechanisms. (×)
80. [Multiple choice question] () Applying color-changing paint to the busbar is a way to judge heat. (√)
81. [Multiple choice question] () The test of the tangent value of the loss angle of the insulating oil medium is carried out under the power frequency voltage. (√)
82. [Multiple choice question] 10(6) The top arrangement of the double return poles of KV high-voltage distribution lines includes three types: triangle, horizontal plus horizontal, and vertical. (√)
83. [Multiple choice question] T610 horizontal "safety production simulation exam 一一一" boring machine steel ball continuously variable transmission reaches the limit position, and the motor that drags the transmission should automatically stop. () (√)
84. [Multiple choice question] The connection between the in-phase coils of the stator winding of three-phase asynchronous motor should proceed in the direction of the current. (√)
85. [Multiple choice question] In the neutral point direct grounding system below 1kV, the grounding resistance value of the neutral point of power transformer should not be greater than 10Ω. (×)
86. [Multiple choice question] In addition to stroke control and limit protection, the proximity switch function uses can also detect the presence of metal, high-speed counting, speed measurement, positioning, changing the direction of motion, detecting part size, liquid level control and use as a contactless button, etc. (√)
87. [Judgement Question] When the thyristor is forward blocked, there is only a small forward leakage current between the anode and the cathode. (√)
88. [Judgement Question] There is a PN junction between the control electrode and the anode of the thyristor, and its discrimination method is the same as the polarity determination method of crystal diode . (×)
89. [Multiple choice question] valve arrester with branch resistance. If the conductivity current drops significantly, it means that the branch resistance has aging, poor contact, etc. (√)
90. [Multiple choice question] The operation of the gas relay means that a failure occurs inside the transformer. (×)
91. [Multiple choice question] The organization of the production process is the basic content of workshop production management. ()( √ )
92. [Multiple choice question] The transformer ratio of voltage transformer is equal to the turns ratio of its original and secondary windings. (√)
93. [Multiple choice question] The color of the indicator light in the electrical control line is generally the same as the color of the button for the corresponding function (). (√)
94. [Multiple choice question] Recording the use process of special equipment is a means to strengthen responsibility and a measure to ensure safe operation. () ( √ )
95. [Multiple choice question] Electric energy is electric power, and its unit is "watts". (√)
96. [Multiple choice question] During use, the DC two-arm bridge should move quickly to avoid burning the evacuation meter. (×)
97. [Multiple choice question] The electromagnetic braking methods commonly used by DC motors include reverse braking and feedback braking. (×)
98. [Judgement Question] The voltage leading current in a pure capacitor circuit is 90°. (×)
99. [Multiple choice question] When installing fuses, bend in a clockwise direction and press under the washer. (√)
100. [Multiple choice question] () Resonant overvoltage belongs to external overvoltage.(×)
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