1.When reversing the switch to operate power transmission, first close the load side isolation switch, then close the circuit breaker, and finally close the bus side isolation switch. （×
2.When the transformer is out of power, stop the load side first, and then the power side. （√
3.The operation ticket must be filled out by the operator after receiving the instruction and before the operation. （√
4.The operation ticket filled in must be checked with the system diagram or simulated disk before the operation can be performed. （√
5.When it is verified that the equipment has no voltage, the three-phase short circuit of the maintenance equipment should be immediately carried out. （×
6.The grounding wire must be connected to the grounding terminal first, and then to the conductor end. （√
7.Assemble and disassemble the grounding wire without using an insulating rod or wearing insulating gloves. （×
8.The wiring is single-core copper wire, and the cross-section meets the requirements. （×
9.In order to power off the maintenance equipment, the disconnector must be pulled so that there is at least one obvious disconnection point on all sides. （√
10.In the event of a power outage, the operating energy source of the circuit breaker and disconnector should be disconnected. （√
11.The neutral point of any star-wiring device in use must be considered as a live device. （√
12.Protective neutral lines (pen lines) should be painted with vertical strips intervals light blue. （√
13.The working neutral line should be painted green and yellow. （×
14.The IT system indicates that the neutral point of the power supply is grounded, and the metal enclosure of the electrical equipment is not grounded.
15.The TT system represents the neutral point of the distribution network and the grounding of the metal shell of the electrical equipment. （√
16.After the leakage protector is activated, no accident point is found, and a trial power transmission is allowed. （√
17.The arrester should be installed as close to the transformer as possible, and the grounding wire should be connected with the low-voltage neutral point of the transformer and the metal shell for grounding. （√
18.Static electricity on the conductor can be eliminated by the grounding method. （√
19.When the drop-out fuse is powered, the middle phase should be closed first, then the upwind side phase, and finally the upwind side phase. （×
20.When the three-phase voltage of the power supply is balanced, the deviation between any phase of the three-phase current and the average value of the three-phase shall not exceed 5%.
21.When the motor is running according to the rated output, the degree of voltage imbalance between phases shall not exceed 10% (
22.The motor can generally operate in the range of -5%-+10% of the rated voltage change, and its rated output remains unchanged. （√
23.Once the motor is suddenly disconnected, it should be stopped immediately for inspection. （√
24.The service period of the temporary line is generally 15 days, and there are approval procedures for the temporary wiring device. （√
25.The connecting wire of the welding tong on the secondary side of the arc welding machine shall not be connected to zero (or grounding), and the other wire on the secondary side can only be connected to zero (or grounding) at one point. （
26.In order to prevent electric shock from stepping voltage, insulated boots can be used as basic safety equipment. （√
27.For equipment with a rated voltage of more than 500V, a 1000V or 2500V insulation resistance meter can be used for insulation resistance measurement. （√
28.A clamp ammeter can only measure the current of a one-phase wire at a time. （√
29.The secondary winding of the voltage transformer is not allowed to open the circuit, and the secondary winding of the current transformer is not allowed to be short-circuited. （×
30.DC ammeters can be used in AC circuits. （×
31.Clamp ammeters can be made to measure both AC and DC currents. （×
32.Use a multimeter to measure the resistance, and zero the pointer every time you change the ohm. （√
33.The greater the internal resistance of the ammeter where the current is measured, the better. （×
34.Whether it is measuring direct current or alternating current, the neon lamp emitting of the electroscope is the same. （×
35.The protective terminal of the soldering iron can be wired or unwired. （×
36.When installing the temporary grounding wire, the three-phase line end should be installed first, and then the grounding terminal should be installedOn the contrary, remove the grounding terminal first, and then disassemble the three-phase line end. （×
37.Welding machine.
The length of the primary and secondary wiring should not exceed 20m. （
38.Both the AC ammeter and the voltmeter indicate valid values. （√
39.Insulated boots can also be used as acid, alkali and oil resistant boots. （×
40.The safe ampacities of the conductor should have different values at different ambient temperatures, and the higher the ambient temperature, the greater the safe ampacity. （×
41.When the steel-core aluminum stranded wire passes through the alternating current, due to the skin effect of the alternating current, the current actually only flows through the aluminum wire, so its effective cross-sectional area is only part of the area of the aluminum wire. （√
42.Bare wires must be laid indoors at a height of 3More than 5m, less than 35m is not allowed to be erected. （×
43.The wires are laid in the ceiling or ceiling, and can be protected without pipes. （×
44.All pipe-through lines must have no more than 1 in-pipe connection. （×
45.The cable core is sometimes pressed into round, semicircular, fan-shaped and other shapes, which is to reduce the cable size and save raw materials. （√
46.When the power failure of the substation, pull the isolation switch first, and then cut off the circuit breaker. （×
47.During the operation of the high-voltage disconnector, if it is found that the surface of the insulator is seriously discharged or the insulator is broken, the high-voltage disconnector should be immediately disconnected and withdrawn from operation. （×
48.The high-voltage load switch has an arc extinguishing device that can disconnect the short-circuit current. （×
49.The degree of risk of electric shock depends entirely on the amount of electric current passing through the body. （×
50.For experienced electricians, it is not necessary to use a voltage tester to test after a power outage. （×
51.After using the 36V safety voltage, it is guaranteed that there will never be an electric shock accident again. （×
52.If the installation of low-voltage temporary lighting is very reliable, it can also use the "one line, one place" power supply method. （×
53.Rubber shoes worn on rainy days can also be used as insulated shoes when performing electrical work. （×
54.The specific provisions in the electrical safety regulations should be flexibly adjusted according to the specific situation in practice. （×
55.In the factory with flammable and explosive hazards, it is forbidden to use aluminum core insulated wire wiring. （√
56.When using a 1 1 safety isolation transformer, its secondary end must be reliably grounded. （×
57.Usually, after the shunt capacitor bank is cut off the circuit, it discharges itself through the voltage transformer or discharge bulb, so the substation does not need to be manually discharged after the power failure and can be repaired. （×
58.The leakage protector cannot protect the two-phase electric shock, nor can it protect the short circuit between the phases. （√
59.The primary current of the current transformer depends on the secondary current, and the larger the secondary current, the larger the primary current. （×
60.Generally, the knife switch cannot cut off the fault current, nor can it withstand the electrodynamic and thermal effects caused by the fault current. （×
61.Motors that are frequently forward, reversed and frequently started are suitable for protection by thermal relays. （×
62.The voltage tester is the main tool for low-voltage electrical testing, which is used for the detection of 500V and 1000V voltages. （×
63.Lighting fixtures in flammable and explosive places should be used closed or explosion-proof lamps, and waterproof and dustproof lamps should be used in dusty, humid and corrosive gas places. （√
64.Lighting switches in dusty, humid places or outdoor places should be made of porcelain waterproof cable switches. （√
65.Generally, for low-voltage equipment and circuits, the insulation resistance should not be less than 05m, the lighting line should not be less than 022mω。（
66.For lines with multiple motor loads, the rated fusing current of the fuse should be greater than or equal to 15~2.5 times the sum of the rated currents of each motor. （×
67.When using an RL spiral fuse, the center contact of the base is connected to the load, and the spiral is partially connected to the power supply. （×
68.The rated capacity of a transformer refers to the apparent power output of the transformer. （√
69.The power phase (fire) wire can be connected directly to the luminaire, while the switch can control the ground wire. （×
70.Safety voltage lighting transformers use double-turn transformers and can also be used with autotransformers. （×
71.A single-phase transformer with a rated voltage of 380 220 can be connected to the power supply of 380 on the secondary side when used as a step-up transformer, and an output voltage of about 656 can be obtained on the primary side. （×
72.The motor housing must have reliable protective grounding or zero connection. （√
73.When the transformer is in a power outage, the load side is stopped first, and then the power supply side is stopped, and the opposite is true when the power is transmitted. （√
74.In order to ensure safety, hand-held power tools should be selected as much as possible. （×
75.Electrical safety inspections are generally conducted once a quarter. （√
76.Hand-held power tools should be managed by a special person and checked for safety and reliability frequently. Classes and classes should be used as much as possible. （√
77.Electrical safety inspections are necessary to prevent accidents before they occur. （×
78.The protective ground end (facing the top end of the socket) and the zero end (facing the bottom left hole of the socket) of the single-phase three-pin power socket can be connected with a wire to share a single wire. （×
79.The power cord is the same when it is connected to the socket or connected to the plug. （×
80.The phase (fire) wire of the screw lamp head should be connected to the tongue in the center of the lamp mouth, and the neutral wire should be connected to the threaded mouth. （√
81.The rated voltage of the motor refers to the voltage per phase of the input stator windings and not the voltage between the lines. （×
82.When the asynchronous motor is started with Y-δ step-down, the stator windings are first connected by δ, and then changed to Y-connection operation. （×
83.The insulation grade of the motor indicates the level of the temperature limit that the insulation material and wire of the motor winding can withstand. For example, Class E insulators allow a maximum temperature of 120 degrees Celsius. （√
84.The starting method of the wound rotor asynchronous motor is often started by Y-δ decompression. （×
85.When the wound rotor asynchronous motor is started with rotor string resistance, the larger the string resistance, the greater the starting torque. （×
86.Check the insulation resistance of the stator and rotor windings of the low-voltage motor between the phases and the winding to the ground, and when measured with 500V insulation resistance, its value should not be less than 05m, otherwise it should be dried. （√
87.For operations that are only a single operation, an accident handling operation, pulling the grounding switch and removing a single set of grounding wires, it is not necessary to fill in the operation ticket, but it should be recorded in the operation record book. （√
88.The operation of electrical equipment must be carried out by two people, with a person of lower rank acting as a supervisor and a person of higher rank acting as the operator. （×
89.In the operation of the substation, the operation ticket can not be filled in for items such as connecting or disassembling the ground wire, checking the power and installing and disassembling the fuse of the voltage transformer circuit. （×
90.For the power failure operation of the substation, the "power inspection" work after the circuit is cut off can not be filled in the operation ticket. （×
91.In the rescue of electrocuted victims, cardiac injections such as coramine, lobeline, which excite the respiratory center, or epinephrine that makes the heart beat back can be used instead of manual breathing and chest heart squeezing. （×
92.If the power supply is introduced from the main step-down substation and distribution station in the plant, and the transformer capacity is less than 500kva, there can be no special person on duty, and only patrol inspection can be arranged. （√
93.After the power failure of electrical equipment, the equipment shall not be touched or entered into the fence of the equipment before disconnecting the power switch and taking safety measures to avoid personal electric shock accidents. （√
94.Changing the power frequency of the asynchronous motor changes the speed of the motor. （√
95.When a person is electrocuted, cardiopulmonary resuscitation should be carried out immediately and quickly. （×
96.When the transmission line under the jurisdiction of the user is stopped and transmitted, the user applicant shall decide. （√
97.In an RLC series circuit, the RMS of the total voltage is always greater than the RMS of the individual components. （×
98.A current transformer, also known as an instrument converter, is an instrument that turns a large current into a small current. （√
99.A transformer is a static electrical device, which is used to change a certain value of AC voltage into another or several different values of AC voltage of the same frequency. （√
100.The high-voltage voltage detector is a tool used to check whether the high-voltage network substation and distribution equipment, overhead lines, and cables are live. （√