question bank source: Production Safety Simulation Examination Yitong Official Account Mini Program
2022 Electrician (Junior) Operation Certificate Examination Question Bank is the new version of the textbook outline question bank! The 2022 Electrician (Junior) Examination Question Bank and mock exam are based on the Electrician (Junior) Examination Syllabus. The electrician (junior) review mock exam will be carried out at any time according to the production safety mock exam.
1. [Single choice question]() works in the reverse bias state and works due to changes in the PN junction capacitance. (A)
A, switch diode
B, varactor diode
C, voltage stabilization diode
D, wave detector diode
2, [Single choice question] When bandaging wire connectors in a 220V line, a layer of vinyl tape should be used. (B)
A, 1
B, 2
C, 3
D, 4
3, [Single choice question] The PVC wire trough should be installed firmly to ensure horizontal and vertical; the spacing between fixed fulcrums should generally not be greater than (). (D)
A, 4.0-4.5m
B, 3.0-3.5m
C, 2.0-2.5m
D, 1.0-1.5m
4, [Single choice question] The model of an diode is 2AP7, where P means (). (D)
A, germanium material
B, silicon material
C, voltage stabilization tube
D, ordinary tube
5, [Single choice question] When the current current passes through a conductor with uneven thickness, the current intensity on each cross section of the conductor (). (C)
A, proportional to each cross-sectional area
B, inversely proportional to each cross-sectional area
C, independent of each cross-sectional area
D, change with the change of cross-sectional area
6, [Single choice question] Generally, printed circuit board , the installation wire should be used to use soldering iron , the temperature of soldering iron is (). (A)
A, 300~400℃
B, 300℃
C, 400℃
D, 400~500℃
7, [Single choice question] The fα of transistor is higher than or equal to () is a high frequency tube. (C)
A, 1MHz
B, 2MHz
C, 3MHz
D, 4MHz
8, [Single choice question] The packaging of transistors can be divided into (). (A)
A, plastic, metal
B, metal, rubber
C, rubber
D, ceramic
9, [Single choice question] three-phase asynchronous motor often has a () starting method. (B)
A, 1 type of
B, 2 types of
C, 3 types of
D, 4 types of
10, [Single choice question] Common faults of three-phase asynchronous motors are: (), motor vibration, motor has low speed or low torque after starting. (B)
A, mechanical load is too large
B, motor overheating
C, voltage is severely unbalanced
D, core deformation
11, [Single choice question] The () stop button in the jog control line of the three-phase asynchronous motor. (B)
A,
B,
C,
D,
D,
12, [Single choice question] Three-phase squirrel cage asynchronous motor, when starting with an elastic triangle, the voltage of each phase winding (). (A)
A, larger than Y-△, smaller than full voltage start
B, equal to the voltage
C, 3 times that of full voltage start
D, 1/3 times that of full voltage start
13, [Single choice question] The following statement about the application of voltage transformer is correct ().(A)
A, used for high-voltage AC voltage measurement
B, used for high-voltage DC voltage measurement
C, used for low-voltage AC current measurement
D, used for low-voltage DC voltage measurement
14, [Single choice question] The following incorrect method for maintenance and use of the climbing board is (). (A)
A. After use, hang in a cool place to save
B. After use, hang in a ventilated and dry place to save
C. Before use, check the rope and pedal
D. When climbing the rod, the groove must be upward
15. [Single choice question] Among the following statements, the one that does not meet the specific requirements of the language specifications is (). (D)
A. The language sense is natural, not dull,
B. Use respectful titles, not taboo
C. The speaking speed is moderate, not fast or slow
D. Use humorous language more to adjust the atmosphere
16. [Single choice question] The adjustment tube in the series voltage stabilization circuit works in the () state. (A)
A, amplified
B, saturated
C, cut off
D, switch
17, [Single choice question] The oil switch that is powered after the accident trips should be checked at least () times within 3 hours. (D)
A, 2
B, 3
C, 5
D, 8
18, [Single choice question] The biggest feature of diodes is (). (D)
A, switch
B, luminous
C, voltage stabilization
D, one-way conductive
19, [Single choice question] The insulation of AC electrical equipment mainly considers AC (). (B)
A, average value
B, maximum value
C, effective value
D, instantaneous value
20, [Single choice question] The main function of protecting grounding is () and reducing the current flowing through the human body. (C)
A, preventing personal electric shock
B, reducing ground current
C, reducing ground voltage
D, short-circuit protection
21, [Single choice question] Full-voltage starting is only suitable for situations where the capacity of the motor is less than () kilowatts. (D)
A, 75
B, 17.5
C, 10.5
D, 7.5
22, [Single choice question] Regarding auxiliary contact of contactor , the following statement is correct (). (B)
A,
B is not often used,
B is often connected to the motor control circuit
C,
D is often connected to the motor main circuit
23, [Single choice question] Regarding the use of voltmeter , the following statement is correct (). (A)
A, parallel in the circuit under test
B, series in the circuit under test
C, can be connected in the circuit under test
D, DC voltmeter can also directly measure the AC voltage
24, [Single choice question] Single-phase half-wave rectifier circuit , after adding a capacitor filter, the maximum reverse voltage that the rectifier diode will (). (C)
A, unchanged
B, lower
C, increase
D, the same single-phase half-wave rectifier circuit
25, [Single choice question] One of the conditions that must be met when running single-phase transformer in parallel is (). (B)
A, the original and secondary side voltages are equal
B, the load properties are the same
C, the load size is the same
D, the capacity must be equal
26, [Single choice question] The voltage amplification process during dynamic analysis of a single tube voltage amplification circuit. Under the action of DC power supply and AC signal, the amplification circuit has both DC components and AC components in the circuit.(C)
A, resistance
B, capacitor
C, current and voltage
D, transistor
27, [Single choice question] A two-speed asynchronous motor changes the wiring method of the stator winding to change (), thereby achieving dual-speed operation. (D)
A, voltage on the winding
B, power supply frequency
C, slip rate
D, magnetic pole logarithm
28, [Single choice question] There are () methods for speed regulation of two-speed asynchronous motors. (C)
A, 1
B, 2
C, 3
D, 4
29, [Single choice question] When above 100 megahertz, generally cannot use () coil . (B)
A, hollow core
B, ferrite
C, bakelite
D, plastic
30, [Single choice question] Among the following poles, one that may belong to both the load-bearing poles and the linear poles is (). (B)
A, linear pole
B, span pole
C, terminal pole
D, branch pole
31, [Single choice question] When selecting AC contactor , you need to determine () and decide the specific type. (D)
A, rated working voltage
B, rated working current
C, auxiliary contact
D, pole number and current type
32, [Single choice question] The most widely used metal resistor in industry, its main structural form is (). (C)
A, metal film resistor and metal oxide film resistor
B, fixed resistance and variable resistance
C, frameless spiral type, porcelain tube type, porcelain disc type, frame type, iron plate grid resistance element and frequency-sensitive rheostat
D, carbon film resistor and wire-winding resistance
33, [Single choice question] A pull wire is installed on the load bearing rod with unbalanced tension, and usually the angle between the pull wire and the pole is (). (C)
A, 20°
B, 30°
C, 45°
D, 50°
34, [Single choice question] If the power of 120 coulombs passed in the conductor within 1 minute, the current intensity in the conductor is (). (B)
A, 1 ampere
B, 2 ampere
C, 3 ampere
D, 4 ampere
35, [Single choice question] The position of installing cross-bar , the straight pole should be installed on the () side. (B)
A, power supply side
B, load side
C, tension side
D, anti-tension side
36, [Single choice question] Complete, safe production simulation exam one point pass, the project code sequence consists of four code segments () . (D)
A, high-level code
B, location code
C, type code and terminal code
D, including the above three statements
37, [Single choice question] Factory electrical lighting is divided into () according to the power supply method. (A)
A, 2
B, 3
C, 4
D, 5
38, [Single choice question] It is known that the sinusoidal voltage μ = 311sin314T, and the voltage instantaneous value is () when T = 0.01 seconds. (A)
A, 0v
B, 311v
C, 314v
D, 220v
39, [Single choice question] When using ammeter to measure current, the ammeter and circuit must be (). (A)
A, tandem
B, parallel
C, hybrid
D, arbitrary connection
40, [Single choice question] After the contactor contact is replaced, it should be adjusted ().(A)
A, pressure, open distance, over-range
B, pressure, open distance
C, open distance, over-range
D, pressure, over-range
41, [Single choice question] The maximum value of AC voltage with an effective value of 220 volts is (). (D)
A, 220v
B, 380v
C, 250v
D, 311v
42, [Single choice question] When a certain line is from maintenance to operation, the first step in operating the ticket is (). (C)
A, load-side knife switch
B, power-side knife switch
C, check switch in the open position
D, line switch
43, [Single choice question] The detector diode belongs to () diode. (A)
A, switch type
B, rectifier type
C, microwave type
D, variable capacity type
44, [Single choice question] Thermal relay is used for () protection of three-phase asynchronous motors. (C)
A, short-circuit
B, pressure loss
C, overload
D, grounded
45, [Single choice question] When wiring porcelain plywood, the core cross-section of the aluminum core wire should not be less than ()mm2. (B)
A, 1
B, 1.5
C, 4
D, 6
46, [Single choice question] Use the multimeter red meter pen to touch one foot of the transistor, and the black meter pen to contact the other two pins respectively, the measured resistance is small, so the pin contacted by the red meter pen is (). (A)
A, base
B, emitter
C, collector
D, uncertain
47, [Single choice question] Use high-voltage pulses to cause the cable fault point to discharge, generate discharge sound, and use a sensor to receive this discharge sound on the ground, thereby measuring the exact position of the fault point. This method is called (). (A)
A, acoustic measurement method
B, induction method
C, probe method
D, current method
48, [Single choice question] The maximum efficiency of the power transformer occurs when the load carried is full ()% of the load. (D)
A, 90~100
B, 80~90
C, 70~80
D, 50~70
49, [Single choice question] Electric hoists generally use () to supply power. (B)
A, sliding wiring
B, suspended mobile cable
C, cable wire
D, steel pipe wiring
50, [Single choice question] Secondary side connection of voltage transformer (). (D)
A, frequency table
B, ammeter
C, multimeter
D, voltmeter
51, [Single choice question] voltage relay can be divided into () category according to actual use requirements. (B)
A, 2
B, 3
C, 4
D, 5
52, [Single choice question] Capacitor filtering circuit generally uses large capacity () capacitor . (A)
A, electrolytic
B, ceramic
C, mica
D, metalized paper
53, [Single choice question] The on-time change of the rectifier element in the capacitance filter circuit (). (B)
A, long
B, short
C, unchanged
D, uncertain
54, [Single choice question] The specifications of commonly used soldering irons for electricians include (). (D)
A, 25 watts and 45 watts
B, 75 watts and 100 watts
C, 300 watts
D, containing the above three statements
55, [Single choice question] Current·Safety Production Simulation Test One-to-one The direction of Pass is ().(C)
A, direction of negative charge directional movement
B, direction of electron directional movement
C, direction of positive charge
D, opposite direction of positive charge directional movement
56, [Single choice question] When the power supply voltage drops to 70% of the rated value of , incandescent lamp will (). (D)
A, emit blue light
B, completely extinguish
C, light and dark
D, light and dark
D, light and dim
57, [Single choice question] The difference between silicon voltage-regulating diode and rectifier diode is (). (B)
A. The voltage-regulating diode does not have unidirectional conductivity.
B. The voltage-regulating diode can work in the breakdown area. The rectifier diode does not allow
C. The rectifier diode can work in the breakdown area. The voltage-regulating diode cannot
D. The terminal voltage is stable when the voltage-regulating diode breaks down. The rectifier diode is not
58. [Single choice question] When the cross-section of the hard aluminum bus is 50F5 or below, the bending radius of flat-bend is () times its thickness. (C)
A, 1
B, 1.5
C, 2
D, 2.5
59, [Single choice question] The size of the self-induced electromotive force in the coil has nothing to do with coil (). (C)
A, current change rate
B, number of turns
C, resistance
D, surrounding medium
60, [Single choice question] Electrical equipment that can often ensure safe power supply, but some minor components have general defects belong to (). (B)
A, Class I equipment
B, Class II equipment
C, Class III equipment
D, Class IV equipment
61, [Single choice question] The power consumption of the load must be at the rated value of the power meter. Safe production simulation test, one point pass, more than 10%, otherwise it will cause the power meter (). (C)
A, opposite reading
B, too large reading
C, inaccurate measurement
D, metering error
62, [Single choice question] When measuring a clamp ammeter, the range is placed in 5A, and the wire being measured is wrapped around the jaw. At this time, the reading is 2A, and the effective value of the AC current in the wire being transferred is (). (B)
A, 2A
B, 1A
C, 4A
D, 2.8A
63, [Single choice question] The B-H relationship of the properties of ferromagnetic during repeated magnetization is (). (B)
A, initial magnetization curve
B, hysteresis loop
C, basic magnetization curve
D, local hysteresis loop
64, [Single choice question] The model of copper core polyvinyl chloride insulated parallel soft wire is (). (B)
A, RV
B, RVB
C, RVV
D, RVVB
65, [Single choice question] The minimum pressure resistance strength of non-intrinsically safe explosion-proof circuits and their external wiring is (). (B)
A, 1000V
B, 1500V
C, 3000V
D, 500V
66, [Multiple choice question] Which of the following situations are illegal homework? () (ABD )
A, wear hard soles for high-altitude operations
B, remove lighting facilities on equipment
C, Special operation licensed persons can operate independently
D, non-post personnel can stay in dangerous areas
E, disassemble scaffolding and hang safety belt
67, [Multiple choice question] () The three-phase squirrel cage asynchronous motor can be started by Y/△ method. (×)
68. [Multiple choice question] () The capacitor used in series has a high voltage that has a small capacity. (√)
69. [Multiple choice question] () The adjustment tube of the series voltage stabilization circuit is working in the switching state.(×)
70. [Multiple choice question] () When using blowtorch , you only need to open the oil inlet valve and use a match to light the blowtorch port. (×)
71. [Multiple choice question] () The single-phase half-wave rectifier circuit consists of a transformer, two secondary tubes and a load. (×)
72. [Multiple choice question] () After an electrical fire is discovered, you should use water to extinguish the fire as soon as possible. (×)
73. [Multiple choice question] () In power systems above 35KV, insulated clamps are generally not used. (√)
74. [Multiple choice question] () Plastic tube wiring is used in places where it is corrosive but without explosion or mechanical damage. (√)
75. [Multiple choice question] () The voltage, current, and electromotive force whose size and direction do not change with time are collectively called DC . (√)
76. [Multiple choice question] () Conductors can be divided into two categories: bare conductors and insulated conductors. (√)
77. [Multiple choice question] () The work ticket must be issued by a dedicated person, but the issuer does not need to be familiar with the technical level of the staff, equipment conditions, and electrical industry safety work regulations. (×)
78. [Multiple choice question] The design and manufacturing unit and its design and manufacturing personnel are responsible for the quality and safety technical performance of the designed and manufactured amusement facilities. (√)
79. [Multiple choice question] () Under the conditions of market economy , the concept of career choice should be established that more career changes, learn more knowledge and gain more skills. (×)
80. [Judgement Question] () When the grounding body is installed horizontally, its buried depth should not be less than 0.6 meters. (√)
81. [Multiple choice question] () When erecting a "safety production simulation test" wire, the mechanical strength at the wire joint should not be lower than 80% of the original wire strength. (×)
82. [Multiple choice question] () porcelain dielectric capacitor is marked with a value 103 on it, indicating that the value of the capacitor is 103. (×)
83. [Multiple choice question] () The secondary side of the voltage transformer is not allowed to be opened. (×)
84. [Multiple choice question] () There are two ways to position the pole, namely theodolite measurement method and visual measurement method. (√)
85. [Multiple choice question] () When choosing insulating material , you should consider the current, magnetic field strength, air pressure, etc. (×)
86. [Multiple choice question] () The saw tooth of the saw blade is cut in the direction of forwarding, so when installing the saw blade, the tip of the saw tooth should be pushed in the direction of forward pushing. (√)
87. [Multiple choice question] () High-pressure sodium lamp must pay attention to the matching problem of ballast . (√)
88. [Multiple choice question] General knife switches cannot be used to cut off the fault current, nor can they withstand the electrical power and thermal effects caused by the fault current () (×)
89. [Multiple choice question] The resistance value of a general metal material increases although the temperature rises () (√)
90. [Multiple choice question] After the multimeter is used, the conversion switch can be placed in any position. ()( × )
91. [Multiple choice question] The purpose of starting a three-phase asynchronous motor string resistance step-down is to increase the power factor of . ()( × )
92. [Judgement Question] When single-phase asynchronous motor is used to regulate the speed of reactor , the reactor should be connected in series with the motor winding. ()( × )
93. [Multiple choice question] The transformer can change the DC voltage. ()( × )
94. [Multiple choice question] The iron consumption remains unchanged when the transformer is running. () ( √ )
95. [Judgement Question] Transistor time relay is also called semiconductor time relay or electronic time relay . ()( √ )
96. [Multiple choice question] The rated current of the melt refers to the maximum current value of the melt that passes through the melt for a long time under specified working conditions () ( √ )
97. [Multiple choice question] The voltage direction is always the same as the current direction () ( × )
98. [Multiple choice question] The capacitance filter will generate surge current. ()( √ )
99. [Judgement Question] electrician clamps , electrician knife , and screwdrivers are common basic tools for electricians.()( √ )
100. [Multiple choice question] In the resistor series circuit, the larger the resistance value, the greater the resistance voltage divided ()( √ )
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