Coal mine electrical test and maintenance workers exam review questions - Database & Sql Blog Articles

66. The power outage sequence is (d)
1. The power failure operation of the transformer (distribution) should be carried out by two people. One of them is monitored and operated by one person. According to the content and sequence of the operation of the switch operation, the simulation operation is first performed on the operation simulation board, and the switch device can be operated without any error. .
2. The switch on both sides of the transformer, the power failure operation sequence is to stop the load side and then stop the power supply side; first stop the low voltage, then stop the high voltage.
3. When there is a capacitor device, the capacitor group switch should be stopped first, and then each outlet switch should be stopped.
4. When operating the switchgear, stop the circuit breaker first, then stop the isolating switch. When stopping the circuit breaker, stop the circuit breaker first, then stop the total circuit breaker; when stopping the isolation switch, pull the load side first and then pull the power side.
a, 3214 b, 4321 c, 2314 d, 1234
67. The voltage is below 110kV, the voltage is lower, the transmission power is smaller, the transmission distance is shorter, and the main power is supplied to the local load, which is called local network. With the development of the national economy, the voltage level has gradually reached 220kV. Such grids are: (a)
a, local network b, regional network c, city network d, rural network
68. The voltage of 110kV and above, the voltage is higher, the transmission power is large, the transmission distance is long, and the main power is supplied to the large regional substation, called (b)
a, local network b, regional network c, city network d, rural network
69. The main part of the transformer includes (c).
a, a closed core b, two coils (often called windings)
c, a closed core and two coils d, winding
70. The power transformer can be divided into (b) according to the cooling medium.
a, oil immersed b, oil immersed and dry type c, dry d, special transformer
71. The ratio of the primary and secondary voltages of the single-phase transformer to the turns ratio of the primary and secondary windings is (a).
a, proportional b, inverse ratio c, 1:1 relationship d, uncertain
72. The ratio of the primary and secondary currents of the single-phase transformer to the turns ratio of the primary and secondary windings is (b).
a, proportional b, inverse ratio c, 1:1 relationship d, uncertain
73. The iron core of the power transformer is composed of (b) two parts.
a, core column b, core column and iron yoke c, iron yoke d, winding
74. The structure of the transformer core is generally divided into two categories: (d).
a, heart b, shell c, winding d, heart and shell
75. The power transformer adjusts the voltage by setting a tap on one of the side windings and changing (d) to achieve a stepwise adjustment of the voltage ratio.
a, current b, voltage c, winding d, number of turns of the winding
76. The temperature of each component is different when the transformer is running, and (c) the temperature is the highest.
a, core b, transformer oil c, winding d, outer casing
77. In order to facilitate monitoring the temperature of various components of the transformer during operation, (a) is specified as the allowable temperature.
a, upper oil temperature b, core temperature c, winding temperature d, case temperature
78. Parallel operation of the transformer is to connect the primary side and secondary side windings of two or more transformers to (a) and supply power to the load.
a, common bus b, two coils c, neutral point d, winding
79. The isolating switch has no special structure (c), and it is not allowed to use it to carry out the pulling or closing operation.
a, core b, neutral point c, arc extinguishing device d, winding
80. The operation sequence when the isolating switch and the circuit breaker are closed is (b):
a, first cut off the load circuit with a circuit breaker, then disconnect the isolating switch
b. Close the isolation switch first, then connect the load circuit with a circuit breaker.
c. At the same time as the isolating switch is closed, the load circuit is connected by a circuit breaker.
d, the above are all wrong
81. The operation sequence when the isolating switch and the circuit breaker are opened is (a):
a, first cut off the load circuit with a circuit breaker, then disconnect the isolating switch
b. Close the isolation switch first, then connect the load circuit with a circuit breaker.
c. At the same time as the isolating switch is closed, the load circuit is connected by a circuit breaker.
d, the above are all wrong
82. Vacuum circuit breaker refers to (c) a circuit breaker that divides and combines circuits in a high vacuum.
a, isolation switch b, core c, contact d, winding
83. The high voltage circuit breaker is a special electrical appliance for the high voltage circuit under normal or fault conditions.
a, turn on b, turn on or off c, turn off d, all of the above are wrong
84. The main part of the vacuum circuit breaker is a vacuum interrupter, which is composed of (d) and other parts.
a, moving contact and static contact b, static contact and shield
c, moving contact, static contact, shield d, moving contact, static contact, shield, insulating shell
85. Sulfur hexafluoride circuit breaker is a high voltage circuit breaker that uses (d) gas as insulation and arc extinguishing medium.
a, SF2 b, SF3 c, SF5 d, SF6
86. A power device consisting of multiple high-voltage switchgears installed in a power plant, substation or power distribution station is called (a).
a, complete power distribution device b, control device c, power distribution device d, substation
87. Insufficient reactive power will cause (c), thus damaging the electrical equipment, which will seriously cause the grid to collapse, causing the system to collapse and causing large-scale power outages.
a, the system voltage rises b, the system power decreases
c, system voltage decreases d, system current decreases
88. The direct function of the phase shifting capacitor is to increase the line (d) in parallel on the line.
a, current size b, voltage size c, power level d, power factor
89. The ambient temperature of the capacitor should not exceed (c).
a, 20 ° C b, 30 ° C c, 40 ° C d, 50 ° C
90. The relative humidity of the air around the environment where the capacitor is located should not be greater than (d).
a, 50% b, 60% c, 70% d, 80%
91. The altitude of the environment where the capacitor is located should not exceed (b).
a, 900m b, 1000m c, 1100m d, 1200m
92. High-voltage capacitors with a total oil quantity (a) or higher shall be installed in a separate explosion-proof room.
a, 300kg b, 400kg c, 500kg d, 600kg
93, high voltage capacitors can use (b) as the discharge load;
a, the low voltage winding b of the voltage transformer, the high voltage winding of the voltage transformer
c, lighting equipment d, electric motor
94. The internal three-phase capacitor is (c) when the rated voltage of the delta connection capacitor matches the line voltage.
a, series b, parallel c, delta connection d, star connection
95. The internal three-phase capacitor is (d) when the rated voltage of the delta connection capacitor matches the line phase voltage.
a, series b, parallel c, delta connection d, star connection
96. The current in the capacitor operation should not exceed (c) times the rated current of the capacitor for a long time.
a, 1.1 b, 1.2 c, 1.3 d, 1.4
97. Under normal circumstances, the parallel capacitor should be put into or out according to the height of the line (d) and the level of the voltage.
a, current size b, voltage size c, power level d, power factor
98. When the power factor is lower than (a) and the voltage is low, the capacitor bank should be put into operation.
a, 0.9 b, 0.8 c, 0.7 d, 0.6
99. When the power factor approaches 1 and there is a leading trend, (b) should exit the capacitor bank.
a, the current is high b, the voltage is high c, the current is low d, the voltage is low
100. When the total capacity of the high voltage capacitor bank does not exceed 100kvar, (b) is available.
a, load switch protection and control
b, fall fuse protection and control
c, vacuum circuit breaker or other circuit breaker protection and control
d, AC contactor, knife switch, fuse or knife fuse switch protection and control
101. When the total capacity is 100~300kvar, (a) should be adopted.
a, load switch protection and control
b, fall fuse protection and control
c, vacuum circuit breaker or other circuit breaker protection and control
d, AC contactor, knife switch, fuse or knife fuse switch protection and control
102. When the total capacity is above 300kvar, (c) should be used.
a, load switch protection and control
b, fall fuse protection and control
c, vacuum circuit breaker or other circuit breaker protection and control
d, AC contactor, knife switch, fuse or knife fuse switch protection and control
103. When the total capacity of the low-voltage capacitor bank does not exceed 100kvar, (d) is available.
a, load switch protection and control
b, fall fuse protection and control
c, vacuum circuit breaker or other circuit breaker protection and control
d, AC contactor, knife switch, fuse or knife fuse switch protection and control
104. When the total capacity is above 100kvar, (d) should be used.
a, load switch protection and control
b, fall fuse protection and control
c, vacuum circuit breaker or other circuit breaker protection and control
d, low voltage circuit breaker protection and control
105. The 10kV power capacitor without fuse inside should be protected by the fuse of the stage. The fuse current should be selected according to the rated current of the capacitor (c).
a, 0.5~1 times b, 1.0~1.5 times c, 1.5~2 times d, 2~2.5 times
106. Under normal circumstances, when the whole station is powered off, it should be (a).
a, first open the switch of the capacitor, then pull open the switch of each line
b. First close the switch of each line, then close the switch of the capacitor line
c. Close the switch of each line and close the switch of the capacitor line.
d, the above are all wrong
107. Under normal circumstances, when the whole station resumes power transmission, it should be (b).
a, first open the switch of the capacitor, then pull open the switch of each line
b. First close the switch of each line, then close the switch of the capacitor line
c. Close the switch of each line and close the switch of the capacitor line.
d, the above are all wrong
108. In order to check and repair, after the capacitor is disconnected from the power supply, the worker must use (b) for manual discharge before the worker approaches, regardless of whether the capacitor is equipped with a discharge device.
a, lighting equipment b, portable special discharge load
c, motor d, reactor
109. The static dynamic reactive power compensation device is abbreviated as (d).
a, SUC b, SVB c, SUB d, SVC
110, SVC working principle description The correct formula is: (b)
a, QN = QV + QC + QTCR = constant (or 0)
b, QN = QV - QC + QTCR = constant (or 0)
c, QN = QV - QC - QTCR = constant (or 0)
d, QN = QV - QC = constant (or 0)
111. Articles 443 and 457 of the “Safety Regulations for Coal Mines” stipulate that underground distribution transformers ( d ) are strictly prohibited.
a, the neutral point is not grounded b, the neutral point is grounded by the arc suppression coil
c. The neutral point is grounded directly through the resistor d and the neutral point.
112. Mine high voltage power grid, measures must be taken to limit the single-phase grounding capacitor current not to exceed (b).
a, 10A b, 20A c, 30A d, 40A
113. In the power system, the generator and transformer (as the power source) are connected to the common end of the star connection (a).
a, neutral point b, control device c, power distribution device d, substation
114. In general, the relay protection device consists of (d).
a, measurement part b, logic part c, execution part d, measurement part, logic part and execution part
115. A normal valve type arrester means (c).
a, magnetic blow valve type arrester b, metal oxide valve type arrester
c, silicon carbide valve arrester d, the above are wrong
116. The silicon carbide valve arrester is mainly composed of a plurality of spark gaps and a corundum valve resistance disc (a).
a, series b, parallel c, delta connection d, star connection
117. Ordinary valve type arrester has sufficient insulation strength to the ground due to the spark gap group, during normal operation (b).
a, will be broken down by the power frequency voltage b, will not be broken down by the power frequency voltage
c, will not be broken by high voltage d, the above are wrong
118. The main working element of the metal oxide arrester is (d).
a, linear resistor b, nonlinear resistor
c, metal varistor sheet d, metal oxide varistor
119. The power supply used in substation switch control, relay protection, automatic devices and signal equipment is called (c).
a, AC operating power b, DC operating power
c, operating power supply d, regulated power supply
120, operating power can be divided into ( c ):
a, AC operating power b, DC operating power
c, AC operating power and DC operating power d, the above are wrong
121. For small-capacity substations with relatively simple wiring methods, (a) is often used.
a, AC operating power b, DC operating power
c, AC operating power and DC operating power d, the above are wrong
122. For a substation that is more important and has a larger capacity, it is generally powered by a battery (b).
a, AC operating power b, DC operating power
c, AC operating power and DC operating power d, the above are wrong
123. The basic requirement for operating the power supply is to have enough (d).
a, accuracy b, stability c, rapidity d, reliability
124. From the basic structure and working principle, the transformer is a kind of (b).
a, capacitor b, transformer c, reactor d, special transformer
125, GL series inductive overcurrent relay has both (a) inductive components.
a, inverse time characteristic b, time limit characteristic c, volt-ampere characteristic d, above are all wrong
126. When technical measures to prevent personal electric shock are not used, (c).
a, water can not be used for fire extinguishing b, water can be used for live fire
c, water can not be used for live fire extinguishing d, the above are wrong
127. Dry sand is especially suitable for (c).
a, with electric fire extinguishing b, put out various fires
c. Extinguish the fires of oils and other flammable liquids. D. The above are all wrong. 2. Multiple choice questions.
1. Electrical power related to those parameters (abc)
a, the voltage at both ends of the circuit, the current intensity in the circuit
c, the power-on time is proportional to d, the voltage in the circuit
2. AC power means that the direction and size are periodically changed with time ( abc )
a, current b, electromotive force c, voltage d, electrical work
3. Sinusoidal alternating current means that the direction and size change sinusoidally with time (abc)
a, current b, electromotive force c, voltage d, electric power
4. The following colors are safe colors ( abcd )
a, red b, blue c, yellow d, green
5. The following types of signs are safety signs ( abcd )
a, prohibition mark b, warning sign c, instruction mark d, prompt sign
6. The electrical load is usually divided into the following categories (abc).
a, one type of load b, two types of load c, three types of load d, four types of load
7. The following "five-proof" functions of the high-voltage switchgear are: (abcd)
a, to prevent the load pull (close) isolation switch b, to prevent mis-separation (closed) circuit breaker
c. Prevent the grounding wire d from being charged and prevent the grounding switch from being connected
8. When encountering thunderstorms, pay attention to safety (abcd)
a. It is not suitable to enter temporary shacks, guard posts and other buildings without lightning protection facilities.
b. It is not advisable to hide under the big trees to avoid rain. If you have to stay under the big tree, you must keep the distance between the tree and the branches for more than two meters. You should kneel as much as possible and close your feet together.
c. It is not advisable to use communication appliances (wireless phones, walkie-talkies, radios, televisions, etc.), and the power should be turned off and the antenna disconnected.
d. It is not advisable to raise objects such as umbrellas, shovel, fishing rods and ball pythons in the wilderness. People who are outdoors can return to the house as soon as possible. When thunder and lightning, the windows should be closed. Sometimes some fireballs (ball-like thunder) can break through the window.
9. The main measures to prevent lightning damage to the power supply system are: ( abcd )
a, substation incoming line protection
b. Install the valve type arrester on the busbar of the substation
c. Install the valve type arrester at the neutral point of the main transformer
d. Install a valve type arrester at the terminal of the power cable directly connected to the overhead line.
10. The basic types of short circuits in three-phase power systems are: ( abcd )
a, three-phase short circuit b, two-phase short circuit c, two-phase ground short circuit d, single-phase short circuit
11. The hazard of short circuit current is (abcd)
a. When the short-circuit current passes through the electrical equipment, it will cause serious heat generation of the conductor, causing the temperature of the conductor to rise or even melt, and the insulation may be damaged;
b. A large amount of electric power is generated between the phases to act on the conductor, which may cause deformation or damage of the device.
c. There is often an arc generated in the short circuit. The high temperature arc will burn the faulty equipment or burn people around, and even cause fire.
d. When the short-circuit current passes through impedance components such as transformers and lines, a large voltage drop will occur, which will also cause the voltage at the generator terminal to decrease, thus affecting the normal power supply of the power system.
12. The measures and methods for accelerating the arc extinguishing in the switchgear are as follows: (abcd)
a, the gas longitudinally blows the arc b, the gas laterally blows the arc c, the elongated arc d, the arc is in contact with the solid medium
13. Hazards of overvoltage to the safe operation of the power system: (abcd)
a, lightning strikes will cause casualties
b, not only interrupt the power supply
c, causing fire
d, power line and electrical equipment insulation breakdown damage
14. Lightning overvoltage is related to meteorological conditions and is caused by external causes, so it is also called atmospheric overvoltage or external overvoltage. Its form is divided into ( abcd )
a, direct lightning strike voltage b, lightning strike counter overvoltage
c, inductive lightning overvoltage d, lightning intrusion wave
15 of the following forms are internal overvoltages ( abc )
a, power frequency overvoltage b, resonant overvoltage
c, operating over voltage d, inductive lightning overvoltage
16. The following electrical injuries are (abc)
a, electric burn b, electric impression c, skin metallization d, heart stop beating
17. The following are electrical injuries ( abcd )
a, contact burn b, arc burn c, electric imprint d, skin metallization
18. The following factors that are responsible for electric shock damage are ( abcd )
a, current intensity and current duration
b, human body resistance
c, acting on the human body voltage
d, current path
19. In electric shock damage, the current is divided into (abc)
a, sense current b, get rid of current c, lethal current d, detection current
20. Human body resistance is determined by the following factors (abcd)
a, contact voltage b, current path c, duration d, contact area
21. The following are the types of electric shocks ( abcd )
a, single-phase electric shock b, two-phase electric shock c, strid voltage electric shock d, contact voltage electric shock
22. Measures to prevent electric shock accidents include ( abcd )
a, insulation and screen protection measures b, using safety voltage c, protective ground d, working ground
23. The protective earthing and working grounding of electrical equipment are to ensure personal safety. In order to make the safety grounding work properly, the following problems should be noted (abcd)
a. Control the grounding resistance within the allowable range. For example, the grounding resistance of low-voltage electrical equipment and transformers is not more than 4Ω; when the total capacity of the transformer is not more than 100kVA, the grounding resistance is not more than 10Ω.
b. The N-line main line is not allowed to be equipped with switches or fuses.
c. The N lines of each device are not allowed to be connected in series, and should be directly connected to the N lines.
d. In the low-voltage power distribution system, the hole of the N-pin socket connected to the N-line of the power supply is not connected with the hole of the PE line, otherwise the metal casing of the equipment will be charged; if the N-line and the phase line are reversed, Bring dangerous voltage to the enclosure.
24. Which of the following equipment and components in the power distribution system require grounding protection ( abcd )
a metal casing or foundation for motors, transformers, circuit breakers and other electrical equipment;
b. Transmission of electrical equipment;
c, the secondary winding of the transformer;
d. Metal or reinforced concrete frame of the distribution equipment inside and outside the house;
25.按照《煤矿安全规程》、《电业安全工作规程》等有关规定，防触电安全措施包括：（ abcd ）
a、必须经过专业培训，考试合格，持有效证件上岗。
b、具有一定的电气理论知识和电工基础知识，了解电气设备的性能、结构原理和保护装置的运行情况，掌握检修、试验、维护技术，熟悉质量标准、安全技术要求及其他有关规程和标准。
c、熟悉维修范围内的供电系统、电气设备和电缆线路的主要技术特征，以及电缆的分布情况。
d、所有停送电工作，必须严格程序操作，办理停送电工作票，除工作负责人外，严禁无票停送电或约时停送电。
26.低压配电电器包括（ abcd ）
a、刀开关b、转换开关c、熔断器d、断路器
27.低压控制电器包括：（ abcd ）
a、接触器b、控制继电器c、启动器d、控制器
29.低压开关的用途包括：（ abcd ）
a、隔离b、转换c、接通电路d、分断电路
30.以下属于低压开关的是：（ abcd ）
a、刀开关b、铁壳开关c、转换开关d、低压断路器
31.下列继电器属于常用继电器的有：（ abcd ）
a、热继电器b、中间继电器c、电流继电器d、电压继电器、速度继电器、等等。
32.下列继电器属于常用继电器的有：（ abcd ）
a、热继电器b、中间继电器c、电流继电器d、速度继电器
33.下列继电器属于常用继电器的有：（ abcd ）
a、热继电器b、压力继电器c、电流继电器d、速度继电器
34.以下那些种类属于时间继电器（ abcd ）
a、电磁式b、电动式c、空气阻尼式d、晶体管式
35.三相异步电动机在煤矿中主要应用于：（ abcd ）
a、采煤工作面b、掘进工作面c、井下通风d、排水
36.指针式万用表应注意那些事项：（ abcd ）
a、选择适当的倍率档，使指针尽量接近标度尺的中心部分，以确保读数比较准确；
b、测量电阻之前，或调换不同倍率档后，都应将两表笔短接，用凋零旋钮调零，调不到零位时应更换电池；
c、测量完毕，应将转换开关拨到交流电压最高档上或空档上，以防止表笔短接，造成电池短路放电；
d、严禁用万用表的电阻档直接测量微安表、检流计、标准电池等类仪器仪表的内阻。
37.接地电阻测量仪表使用注意事项包括：（ abcd ）
a、测量前应将接地装置与被保护的电气设备断开，不准带电测试接地电阻。
b、测量前仪表应水平放置，然后调零。
c、接地电阻测量仪不准开路摇动手把，否则将损坏仪表。
d、将倍率开关放在最大倍率档，按照要求调整再计算得出接地电阻值
38.高压验电器操作技法包括：（ abcd ）
a、使用高压验电器验电前，应戴绝缘手套，并使用相应电压等级的验电器。确定有电源处实验，确保验电器完好
b、使用时要特别注意手握部位不能超过护环。
c、在证明验电器确实完好后，应将验电器的金属钩逐渐靠近被测高压线，直至氖管窗发光。
d、只有氖管不亮时，确认无电后才可与被测物体直接接触。
39.下列属于高处作业操作技法的是：（ abcd ）
a、高空作业必须配戴合格的安全带，安全带必须可靠的栓在牢固的物体上，这个物体与人站立的地点之间不许存在相对运动的可能性。
b、作业用具必须牢固可靠，作业用的构架、立柱和跳板必须可靠固定。
c、风力六级以上或雷雨天气时，禁止在露天高处作业。遇冰雪时，应有防滑措施。
d、无可靠的防范措施，不准在同一空间的上下层同时作业。
40.撬时的操作安全规范包括：（ abcd ）
a.不得使用砖头、矸石或易碎物品做支点。
b.不能使用木板皮做撬杠。
c．操作人员必须选择合适的站位。
d.两人或两人以上操作时，动作必须协调一致，相互照应。
41.磨时的操作安全规范包括：（ abcd ）
a.不得使用砖头、矸石或易碎物品做支点；
b.不能使用木板皮做撬杠。
c．操作人员必须选择合适的站位。
d.两人或两人以上操作时，动作必须协调一致，相互照应。
42.拔时的安全规范包括：（ abcd ）
a.撬杠插入深度要适当，不能一次插入过深；
b.撬杠必须有足够的强度。
C．操作人员必须选择合适的站位。
d.两人或两人以上操作时，动作必须协调一致，相互照应。
43.顶和落时的操作规范包括：（ abcd ）
a.将千斤顶安放在重物下面的适当位置。
b.操作千斤顶，将重物顶起。
c．在重物下垫进枕木垛，并落下千斤顶。
d.垫高千斤顶，准备再顶升。
44.顶和落时的操作安全规范包括：（ abcd ）
a.在使用千斤顶前，应当检查和试验千斤顶。
b.千斤顶底座应垫平找正，底座及顶部必须用木板或枕木垫好。不得用铁板等易滑材料。
c．升起重物时，应在重物下随起随垫，顶重物的过程中，千斤顶应平正直立，不得歪斜，防止倾倒。
d.在使用油压千斤顶落下重物时，为防止下落速度过快发生危险，要在拆去枕木后，及时放入不同厚度的垫木，使重物离垫木的距离保持在5cm以内，一面落下重物，一面拆去和更换垫木。
45.采用滚时的安全操作规范包括：（ abcd ）
a、滚移重量很大的物体时，上下滚道可采用钢轨制成。滚杠用无缝钢管或圆钢。滚杠的长度应比下滚道宽度长20-40cm。
b、滚杠的直径，根据荷载不同，一般为5-10cm。
c、滚运重物时，重物的前进方向用滚杠在滚道上的排放方向控制。
d、要使重物直线前进必须使滚杠与滚道垂直；要使重物拐弯，则使滚杠向需拐弯的方向偏转。纠正滚杠的方向，可用大锤敲击。
46.起重和运搬工作中安全注意事项包括：（abcd）
a、机具不超载。事先应估计重物的重量，必须在机具允许的负荷以下。
b、准备和检查机具。所有机具都必须在工作前仔细检查，确认安全可靠才允许工作。
c、准备放置地点。事先确定放置地点，清理出物体放置和人员操作的必须空间，准备好承垫用的物品。
d、检查运搬路线。清除通道上的障碍，保证重物和人员顺利通过。
47.电气设备检修、试验工操作时的安全规定包括：（ abcd ）
a、必须有2名以上的人员从事检修、试验工作。
b、 班前不准喝酒，上班时不做与本职工作无关的事情，严格遵守操作的相关规定。工作中，严肃认真、集中精力，严格执行停送电、验电、放电等有关规章制度。
c、需进行倒闸操作时，由变(配)电所的值班人员按倒闸操作规定的顺序和安全要求进行。
d、严禁带电作业，检修工在距离带电体较近或在危险地点工作时，应采取可靠的隔离措施，并设专人监护，否则工作人员有权拒绝执行工作命令。
48.电气设备检修、试验工操作时的安全规定包括：（ abcd ）
a、在进行高压故障修理或高压试验时，工作场所必须用遮栏挡住，并悬挂“高压危险”警示牌。
b、在控制盘和保护盘上工作时，必须将工作盘和两侧运行盘用布幔等加以明显隔开。对新型继电器及继电保护装置，必须有合法证件，否则不准投入使用和运行。
c、在回路上工作时，必须切断一切可以反送电的电源，严禁带电作业。
d、在进行钻孔等振动较大的工作时，应采取防止运行中仪表误动和防止运行中设备掉闸的措施，必要时经值班调度员或值班负责人同意，可将保护装置暂时退出运行。
49..停电注意事项包括：（abcd）
a、设备停电，必须把各方面的电源断开，且各方面至少有一个明显断开点。
b、为了防止有返送电源的可能，应将与停电设备有关的变压器从高低压两侧断开，电压互感器一次侧断开，取下电压互感器的一、二次侧熔丝管。
c、对于柱上变压器，应将高压熔断器的熔丝管取下。
d、拉断电源隔离开关后，开关操作手柄必须锁住。拉断的断路器根据需要取下断路器控制回路的熔丝管。
50.停送电操作工作许可包括哪些内容（ abcd ）
a、工作许可人应负责审查工作票中所列的安全措施是否正确、完备，是否符合现场条件，并完成施工现场的安全措施。
b、在变电所工作时，工作许可人会同工作负责人检查在停电范围内所做的安全措施，并指明邻近带电部位，验明检修设备确无电压后，双方在工作票上签字。
c、在变(配)电所出线电缆的另一端头(或线路上的电缆头)的停电工作，应得到送电端头的值班员或调度员的许可后，方可进行工作。 '
d、工作负责人及工作许可人，任何一方不得擅自变更安全措施及工作项目，工作许可人不得改变检修设备的运行接线方式，如需改变时，应事先得到工作负责人的同意。
51.停送电操作工作许可包括哪些内容（ abcd ）
a、在线路上停电工作时，工作负责人应得到许可人的许可，拉开变配电的开关或隔离开关，并做好安全措施后方可进行工作，在与停电作业线路相交叉、跨越的其他单位的带电线路停电时，应得到有关单位许可人的许可，并完成现场的安全措施后方可工作。
b、在工作过程中，当工作许可人发现有违反安全工作规程规定时，或拆除某些安全设施时，应立即命令工作人员停止工作，并进行更正。
c、在变(配)电所出线电缆的另一端头(或线路上的电缆头)的停电工作，应得到送电端头的值班员或调度员的许可后，方可进行工作。 '
d、工作负责人及工作许可人，任何一方不得擅自变更安全措施及工作项目，工作许可人不得改变检修设备的运行接线方式，如需改变时，应事先得到工作负责人的同意。
52.停送电操作工作许可包括哪些内容（ abcd ）
a、工作许可人应负责审查工作票中所列的安全措施是否正确、完备，是否符合现场条件，并完成施工现场的安全措施。
b、在变电所工作时，工作许可人会同工作负责人检查在停电范围内所做的安全措施，并指明邻近带电部位，验明检修设备确无电压后，双方在工作票上签字。
c、在线路上停电工作时，工作负责人应得到许可人的许可，拉开变配电的开关或隔离开关，并做好安全措施后方可进行工作，在与停电作业线路相交叉、跨越的其他单位的带电线路停电时，应得到有关单位许可人的许可，并完成现场的安全措施后方可工作。
d、在工作过程中，当工作许可人发现有违反安全工作规程规定时，或拆除某些安全设施时，应立即命令工作人员停止工作，并进行更正。
53.下列属于停送电操作监护人的职责的是（ abcd ）
a、部分停电工作时，监护人应始终不间断地监护工作人员的最大活动范围，使其保持在规定的安全距离内工作。
b、带电工作时，监护人应监护所有工作人员的活动范围不应小于与接地部位的安全距离，查看工作位置是否安全、工具使用以及操作方法是否正确等。
c、若发现某些工作人员中有不正确的动作时，应及时提出纠正，必要时令其停止工作。
d、监护人在执行监护工作中，应全神贯注不得兼做其他工作，如需离开工作现场时，应另行指派监护人，并通知被监护的工作人员。
54.停送电操作工作终结和送电包括：（ abcd ）
a、工作终结送电前，工作负责人应对检修设备全面进行质量检查。检查设备的检修工艺质量应符合技术要求。
b、在变(配)电所工作时，工作负责人会同值班员应对设备进行检查，特别应核对隔离开关与断路器分、合位置的实际情况是否与工作票上填写的位置相符，核对无误后双方在工作票上签字。
c、全部工作完毕后，工作人员应清理现场、清点工具和材料，不应将其遗漏在工作现场和检修的设备上。检查接线是否正确，拉、合试验的开关及隔离开关均应在断开位置。
d、线路工作完毕，应检查相序及开关、交叉跨越的距离是否符合规定。
55.停送电操作工作终结和送电包括：（ abcd ）
a、工作终结送电前，工作负责人应对检修设备全面进行质量检查。检查设备的检修工艺质量应符合技术要求。
b、在变(配)电所工作时，工作负责人会同值班员应对设备进行检查，特别应核对隔离开关与断路器分、合位置的实际情况是否与工作票上填写的位置相符，核对无误后双方在工作票上签字。
c、经上述检查后，工作负责人再次仔细对检修设备、工作现场进行检查，认为无问题后宣布工作终结。
d、拆除临时地线、临时遮栏、临时标示牌，恢复常设遮栏和标示牌。临时地线拆除后，工作人员不得触及检修的设备或线路。
56.下列规程属于电气安全规程的有：（ abcd ）
a、电业安全工作规程
b、电业生产事故调查规程
c、特种作业安全工作规程
d、电气设备典型消防规程
57.下列制度属于电气现场管理制度的有：（ abcd ）
a、运行维护制度
b、巡视检查制度
c、缺陷管理制度
d、岗位责任制度
58.电力系统包括：（ abcd ）
a、发电厂b、送变电线路c、供配电所d、用电单位
59.电网的形式分为（ abcd ）
a、地方网b、区域网c、城网d、农网
60电力系统运行的特点：（ abcd ）
a、电能生产、输送和使用的连续性b、与国民经济的各个部门密切相关
c、与人们的生产、生活密切相关d、暂态过程非常短暂
61.对供电系统的基本要求是：（ abcd ）
a、供电可靠b、供电安全c、电能质量d、经济供电
62.矿井供电系统由那些组成（ abcd ）
a、地面变电所b、井下中央变电所c、采区变电所d、工作面变电站和配电点
63.变电所包括那些类型（ abcd ）
a、室外变电所b、室内变电所c、移动式变电所d、箱式变电所
64.变、配电所主接线方式的基本要求（ abcd ）
a、简单、安全、可靠、齐全。尽量达到简单，供电方式可靠，主设备齐全；
b、合理、经济、灵活。设备选择合理，运行安全经济，运行灵活，并适当考虑未来的发展；
c、便于维护，操作简单。便于维护检修，操作步骤简单、方便；
d、对故障处理，能保证安全，便于执行规定的安全措施，年运行损失小。
65.架空线路主要包括一下那些部件（ abcd ）
a、电杆b、横担c、导线d、绝缘子等
66.电缆敷设原则是（ abcd ）
a、敷设路径最短，尽量少拐弯；
b、不受阳光直晒，散热条件要好。
c、尽量避开穿越铁路、公路以及其他管线等。
d、避开规划中的挖土地段。
67.敷设电缆时应注意哪些安全问题（ abcd ）
a、为了使电缆不受挤压和机械损伤，电缆引入及引出建筑物、构筑物、楼板或墙壁时应穿管敷设，穿管其管内径不能小于电缆外径的1.5倍
b、为了使电缆不受挤压和机械损伤，电缆与道路、铁路交叉处应穿管敷设，穿管其管内径不能小于电缆外径的1.5倍
c、电缆不允许与煤气管路、天然气管路以及其他可燃性气体管路敷设在同一沟道中；
d、电缆的金属外皮，封端盒、接线盒、保护管等金属物均应接地。
68、变压器的主要部分包括（ ab ）。
a、一个闭合铁芯b、两个线圈(常称为绕组)
c 、油箱d 、绝缘套管
69、变压器按用途一般分为（ abd ）。
a、仪用互感器b、电力变压器c 、单相变压器d 、特种变压器
70、电力变压器按冷却介质可分为（ bd ）。
a、整流变压器b、油浸式变压器c 、自耦变压器d 、干式变压器
71、电力变压器的铁芯是由（ ac ）两部分组成。
a、铁芯柱b、分接开关c 、铁轭d 、磁通
72、变压器铁芯的结构一般分为（ ac ）两类。
a、心式b、高压c 、壳式d 、低压
73、电力变压器内部主要绝缘材料有（ abcd ）。
a、变压器油b、绝缘纸板c 、电缆纸d 、皱纹纸
74、电力变压器的主要参数有（ abcd ）。
a、额定容量b、额定电压c 、短路电压d 、空载损耗
75、变压器过负载能力可分为（ ab ）。
a、正常情况下的过负载能力b、事故情况下的过负载能力
c、短路情况下的过负载能力d、启动情况下的过负载能力
76、变压器并列运行的目的有（ acd ）。
a、 提高供电可行性正比
b、 提高变压器运行安全性
c、 可以减少总备用容量，并可随着用电量的增加分批增加新的变压器
d、 提高变压器运行经济性
77、变压器理想并列运行的条件有（ bcd ）。
a、变压器的联结组标号相异b、变压器的电压比相等(允许有±5％的差值) c、变压器的联结组标号相同d、变压器的阻抗电压uZ相等(允许有±10％的差值)
78、真空断路器的主要部分是真空灭弧室，它是由（ abcd ）等部分组成。
a、动触头b、静触头c、屏蔽罩d、绝缘外壳
79、六氟化硫断路器由（ abcd ）和操作机构等组成。
a、钢筒外壳b、芯柱c、引线端子d、支持绝缘
80、六氟化硫断路器检修安全注意事项（ abcd ）。
a、 断路器在真空状态下不允许进行“合”、“分”操作
b、 断路器传动拐臂及机构各转动部分加适量的润滑油
c、 机构在正常检修时应将合闸弹簧所储能量释放
d、 只有当输出轴处于分闸位置时才能进行合闸操作
81、六氟化硫断路器的优点包括（ acd ）。
a、在开断小电感电流及电容电路时不会出现过电压b、降低高次谐波
c、允许开断次数多、寿命长、检修周期长d、灭弧能力强
82、在中性点不接地的高压电网中，单相接地电容电流的主要危害（ abcd ）。
a、 产生弧光接地过电压
b、 产生交流杂散电流
c、 造成接地点热破坏及接地网电压升高
d、 产生接地电弧引起瓦斯煤尘爆炸
83、中性点接地方式有以下几种（ abc ）。
a、 中性点不接地b、中性点经消弧线圈接地
c、中性点直接接地d、中性点经电阻接地
84、配电网单相接地故障特点（ abc ）。
a、易造成二次故障b、易产生单相电弧接地过电压
c、易产生铁磁谐振过电压油浸式d、易产生电弧
85、高压开关柜主要由（ bcd ）等部分组成。
a、线圈b、电流互感器c、电压互感器d、断路器
86、无功功率的主要消耗者是（ acd ）等。
a、感应电动机b、电阻c、变压器d、电焊机
87、电力电容器包括（ abcd ）等多种电容器。
a、移相电容器b、串联电容器c、耦合电容器d、压电容器
88、电容器所在环境正确的描述是（ abd ）。
a、 温度不应超过40℃
b、 周围空气相对湿度不应大于80％
c、 周围空气相对湿度不应大于60％
d、 海拔高度不应超过1000m
89、高压开关柜应具有“五防”连锁功能是指（ abcd ）。
a、 防止带负荷推拉断路器手车
b、 防止接地开关处在闭合位置时关合断路器
c、 防止误入带电隔室和防止在带电时误合接地开关的联锁功能
d、 防止误分合断路器
90、自动跟踪补偿消弧线圈作用（ abcd ）：
a、 补偿电容电流，减少电缆放炮几率
b、 减少形成电弧接地过电压的几率
c、 可抑制铁磁谐振过电压
d、 减小电缆损伤，提高电缆寿命
91、继电保护装置的基本任务是（ abd ）
a、 当发生故障时，将故障元件从供电系统中切除。
b、 当出现不正常工作状态时，继电保护装置动作发出信号，减负荷或跳闸。
c、
d、 继电保护装置还可以和供电系统的自动装置配合，缩短停电时间，提高供电系统运行的可靠性。
92、小电流接地选线原理（ abcd ）
a、

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