1.The power phase (fire) wire can be connected directly to the luminaire, while the switch can control the ground wire. （×
2.Safety voltage lighting transformers use double-turn transformers and can also be used with autotransformers. （×
3.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. （×
4.The motor housing must have reliable protective grounding or zero connection. （√
5.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. （√
6.In order to ensure safety, hand-held power tools should be selected as much as possible. （×
7.Electrical safety inspections are generally conducted once a quarter. （√
8.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. （√
9.Electrical safety inspections are necessary to prevent accidents before they occur. （×
10.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. （×
11.The power cord is the same when it is connected to the socket or connected to the plug. （×
12.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. （√
13.The rated voltage of the motor refers to the voltage per phase of the input stator windings and not the voltage between the lines. （×
14.When the asynchronous motor is started with Y-δ buck, the stator windings are first connected according to the δ, and then changed to the Y-connection operation. （×
15.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. In the case of Class E insulation, the maximum permissible temperature is 120 degrees Celsius. （√
16.The starting method of the wound rotor asynchronous motor is often started by Y-δ decompression. （×
17.When the wound rotor asynchronous motor is started with rotor string resistance, the larger the string resistance, the greater the starting torque. （×
18.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. （√
19.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. （√
20.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. （×
21.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. （×
22.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. （×
23.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. （×
24.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. （√
25.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. （√
26.Changing the power frequency of the asynchronous motor changes the speed of the motor. （√
27.When a person is electrocuted, cardiopulmonary resuscitation should be carried out immediately and quickly. （×
28.When the transmission line under the jurisdiction of the user is stopped and transmitted, the user applicant shall decide. （√
29.In an RLC series circuit, the RMS of the total voltage is always greater than the RMS of the individual components. （×
30.A current transformer, also known as an instrument converter, is an instrument that turns a large current into a small current. （√
31.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. （√
32.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. （√
33.Grounding wires are an important tool to keep workers safe in the event of an unexpected voltage on equipment and lines that have been powered out. According to the ministry, the grounding wire must be made of bare copper flexible wire of more than 25mm2. （√
34.The fence is a screen of the equipment installed to prevent the staff from inadvertently touching the live part of the equipment, which is divided into two types: temporary fence and standing fence. （√
35.The step voltage is if the horizontal distance on the ground is 0There is a potential difference between the two points of 8m, and when the feet of the human body touch these two points, the voltage will be applied to the human body. （√
36.The power system is a part of the power system, which is composed of generators and distribution devices of power plants, step-up and step-down substations, transmission and distribution lines and users' electrical equipment. （√
37.The power network is a part of the power system, which is a unified network composed of various substations (stations) and transmission and distribution lines of various voltage levels. （√
38.Each operation ticket can only fill in one operation task, and each operation item should be marked with a mark "".
39.The action that has been performed ticket states "Executed". Voided operations should be marked with the word "voided". Both types of operation tickets should be kept for at least three months. （
40.The operation of the substation (station) must be carried out by two people, of whom the person who is familiar with the equipment is the guardian. （√
41.If there is any doubt during the reverse operation, you can change the operation ticket before proceeding. （×
42.Fill in the operation ticket, including the operation sequence of the operation task, the sender, the operator, the guardian and the operation time. （√
43.When a grounding fault occurs in high-voltage equipment, the safety distance between the human body and the grounding point should be greater than 4 m indoors and 8 m outdoors. （
44.The cooling methods of transformers include oil-immersed self-cooling, oil-immersed air-cooled, strong oil-air-cooled and strong oil-water cooling. （√
45.The electrical meaning of "earth" does not refer to the earth, but to the place where the electric potential is zero. （
46.The disconnector can be used to close fault-free voltage transformers and surge arresters. （√
47.Dispatching at all levels is the relationship between upper and lower levels in the operation and command of the power system. The on-duty dispatcher of the lower-level dispatching agency, the chief of the power plant, and the on-duty chief of the substation shall be under the command of the on-duty dispatcher of the higher-level dispatching agency in the dispatching relationship. （√
48.It is strictly forbidden for staff to move or remove fences, grounding wires, and signs during their work. （√
49.When inspecting outdoor high-voltage equipment during thunderstorms, you should wear insulated boots and should not be close to lightning arresters and lightning rods. （√
50.The grounding of the metal case of electrical equipment belongs to the working grounding. （×
51.When measuring insulation with a megohmmeter, E terminates the conductor and L terminates to ground. （×
52.When using a clamp meter, the two sides of the jaw should be in good contact and there should be no impurities. （√
53.When the line is in a power failure, it must be operated in the order of the circuit breaker bus-side isolation switch and the load-side isolation switch, and the opposite is true when power is transmitted. （×
54.Skilled watchman, simple operation can be operated without operating the ticket, but with experience and memory. （×
55.CPR should be performed consistently on the spot, but the casualty can be moved at will for convenience. （×
56.If someone is found to be electrocuted on the pole or at a height, when conditions permit, efforts should be made to rescue someone on the pole or at a height. （√
57.When live equipment catches fire, dry fire extinguishers, CO2 fire extinguishers, etc. should be used to extinguish the fire, and foam fire extinguishers should not be used. （√
58.When working live on a low-voltage power supply line equipped with a leakage protector, safety measures such as insulated gloves and insulated shoes can be omitted. （×
59.Thanks to the installation of leakage protectors, it is not necessary to use a safe voltage to work in metal containers. （×
60.When the leakage protector is installed, the product certificate, certification mark, and test device should be checked, and the installation must be stopped if any abnormal conditions are found. （√
61.The protection range of the leakage protector should be an independent circuit and cannot be electrically connected to other lines. When the capacity of one leakage protector is insufficient, two cannot be used in parallel, and the leakage protector with the required capacity should be selected. （√
62.If the leakage protector fails, a qualified leakage protector must be replaced. （√
63.The leakage protector in operation should be inspected regularly, at least once a month, and the inspection record should be made. The inspection includes visual inspection, test device inspection, wiring inspection, signal indication and button position inspection. （√
64.The selection of leakage protector should meet the requirements of power supply voltage, frequency, working current and short-circuit breaking capacity. （√
65.If it is difficult to use the safety voltage, it must be approved by the enterprise safety management department before the leakage protector can be used as supplementary protection. （√
66.Hand-held power tools (except for classes), mobile daily electrical appliances (except for classes), other mobile mechanical and electrical equipment, and electrical equipment with a high risk of electric shock must be installed with leakage protectors. （√
67.Leakage protectors must be installed on the electrical equipment of construction sites and temporary lines. （√
68.The leakage protector with the rated leakage action current not exceeding can be used as a supplementary protection for direct contact when other protection measures fail, but not as the only direct contact protection. （√
69.Places where a safe voltage should be used should not be replaced by a leakage protector. （√
70.After the operation of the leakage protector in operation, the fault should be eliminated according to the cause of the operation before the closing operation can be carried out. It is strictly forbidden to forcibly transmit power with faults. （√
71.The person on duty must be familiar with the electrical equipment, and the person on duty alone or the person in charge of the duty should also have practical work experience. （√
72.Inspect the power distribution unit, enter and exit the high-voltage room, and lock the door at hand. （√
73.The reverse operation must be carried out by two people, one of whom is more familiar with the equipment. （√
74.In the event of an electric shock accident, in order to rescue the electrocuted person, the power supply of the relevant equipment can be disconnected without permission, but it must be reported to the superior immediately afterwards. （√
75.Partial power outage refers to a partial power outage of high-voltage equipment, or a complete power outage in the room with the door leading to the adjacent high-voltage room not fully locked. （×
76.Live work must be supervised by a special person. The guardian should be a person with practical experience in live work. Guardians are not allowed to operate directly. The scope of guardianship must not exceed one operation site. （√
77.The high-pressure test work can be done by one person. （×
78.Fill in the work ticket for the high-voltage test. （×
79.The test site should be equipped with a fence or fence and hung outward"Stop, high pressure is dangerous!"and send someone to guard it. If the two ends of the test device are not in the same place, the other end should also be guarded. （√
80.If you use a portable instrument to work on a high-voltage circuit and need a power outage or safety measures for high-voltage equipment, you can do it alone without filling in a work ticket. （×
81.The measurement work of the duty personnel using a clamp ammeter on the high-voltage circuit should be carried out by two people. When the non-duty personnel are measuring, the second type of work ticket should be filled. （√
82.Measuring the insulation of high-voltage equipment using a shake meter can be done by one person. （×
83.Special operations personnel need to be reviewed every two years. （√
84.The first type of work ticket should be filled in for power cable power outage work, and the second type of work ticket should be filled in for work that does not require power outage. （√
85.When entering the aerial work site, a safety helmet should be worn. Seat belts are mandatory for those working at height. （√
86.In case of fire of electrical equipment, the power supply of the relevant equipment should be cut off immediately, and then the foam fire extinguisher should be used to extinguish the fire.
87.When measuring resistance with a multimeter, it must be carried out without a power outage, while measuring resistance with a shake meter does not have to be blackout. （×
88.In order to ensure safety, hand-held power tools should be selected as much as possible. （×
89.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. （√
90.Electrical safety inspections are necessary to prevent accidents before they occur. （×
91.*Hazardous locations do not have special requirements for grounding (zeroing). （×
92.In order to avoid the influence of short-circuit current, the current transformer must be equipped with a fuse. （×
93.The high-voltage fuse has a time-limited characteristic. （×
94.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. （×
95.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. （×
96.In the neutral grounding system, electrical equipment with protective grounding, when the phase wire hits the shell fault, if the human body touches the equipment shell, an electric shock accident will still occur. （√
97.The so-called electric shock refers to the physiological and pathological damage to the human body when an electric current passes through the human body. （√
98.Electrical injury is a traumatic injury caused by the passage of an electric current through the human body. （√
99.Electric shock is a physiological reaction and lesion of the internal organs caused by the passage of an electric current through the body. （√
100.Getting rid of the current is the maximum current that a person can tolerate and can get rid of on his own. （√