电工操作证试题

电工操作证试 题 快递公司问题件快递公司问题件货款处理关于圆的周长面积重点题型关于解方程组的题及答案关于南海问题 (I) First, individual choice questions 1, the risk of body resistance is directly related to A, voltage size B, temperature level C, the size of the power supply through the body 2, new clothes and overhaul after the low voltage lines and equipment, require insulation resistance value is not less than (), Europe A, 1 B, 0.5 C, 0.22 D, 2 3. For low-voltage equipment, the distance between the fence and the bare conductor shall not be less than (meters) A, 0.35 B, 0.5 C, 1 D, 1.5 4, in order to reduce the risk of high voltage into low voltage, in ungrounded power grid, the neutral point of power grid should be grounded A, resistance B, wire C, breakdown fuse, D, coil 5, in the power and lighting mixed power supply lines, should choose () leakage protector A, three pole B, diode C, quadrupole D, monopole 6, in the 10KV no barrier inspection, the human body and its carrying tools and the charged body minimum distance is () A, 1.5m, B, 0.7m, C, 0.35m, D, 0.15m 7. The buried depth of cables buried directly in the ground should not be less than (meters), and should be below the frozen ground A, 0.5 B, 0.7 C, 0.3 D, 0.8 8. The rated current of the fuse used in the low voltage compensation capacitor circuit shall not exceed that of the rated current A, 1, B, 1.2~1.3, C, 2.5~3, D, 1.5~2 9, in particularly dangerous places, such as metal containers should be the role of () hand-held electric tools A, I, class B, II class, C, III class 10 、 on the line with short-circuit protection, the long-term allowable load current of the conductor shall be no more than the times of the rated current of the line melt A, 0.4 B, 0.8 C, 1.25 D, 2.5 11, in the case of dust or explosive mixture, the electrical equipment shell temperature generally does not exceed () degrees A, 65 B, 70 C, 100 D, 125 12, the use of 1211 non conductive fire extinguisher fire, the body and fire extinguishers nozzle to the charged body minimum distance, for 10KV should be () meters A, 0.4 B, 0.7 C, 1 D, 0.6 13, electrical equipment fire should be the first () A, use the non conductive fire extinguisher to save B, disconnect the oil switch or automatic switch, C and disconnect the disconnecting switch 14. When the power failure of the low-voltage equipment is checked and repaired, the power supply of the repaired equipment shall be disconnected immediately A, work B, hang nameplate C, remove fuse D, and install grounding wire 15. If the line of power maintenance and repair is crossed or approached with another line, the distance between the staff and the adjacent line shall comply with the relevant provisions, and the voltage for the adjacent line shall be as follows 10KV or less, the distance shall not be less than () A, 0.7 B, 1 C, 1.5 D, 3 16, from the security point of view, the power distribution line outage should be disconnected A, knife switch, B, contactor C, automatic switch D, push button switch 17, all the temporary line must have a main switch control, each line should be installed () A, fuse, B, knife switch, C, socket D, automatic switch 18, in the power distribution room outside should hang () sign board A, in this work, B, prohibit closing, someone working C, stop, high voltage dangerous, D, please do not switch on 19, according to the "power supply business rules", by the low-voltage public power lines, to the power supply line, the user end of the last support as a point of demarcation, support for the "(") all A, user B, power supply enterprise C, both sides 20. when working on a live voltage transformer, it shall be strictly prevented () A, primary circuit disconnection, B, two circuit disconnection, C, two loop short circuit, D and two circuit overload 21, the different parts of the human body at the same time touching two phase charged body is called () A, step voltage, electric shock B, single-phase electric shock, C, two phase electric shock 22, ambulance electric shock is the first step to electric shock A, do not fall B, out of power C, timely delivery to the hospital 23, the same rod erection of several lines, power lines must be located in the weak line A, B, C, left right above and below D 24 、 high voltage system can be divided into two kinds according to the magnitude of the grounding current, in which the earth current is (below), which is called "small grounding short circuit current system". A, 200 B, 300 C, 500 D, 400 25, direct buried underground cables and deviation between the general grounding body (m) A, 1~! 0.3, B, 0.25~0.5, C, 0.5~1 26. The maximum difference between the three-phase unbalanced current of transformer shall not exceed the rated current A, 5% B, 10% C, 25% D, 15% 27, hand-held power tools should be (at least) comprehensive inspection once A, B per year, monthly C, quarterly Festival, D, and half a year 28, the discharge load of high voltage compensation capacitor should be selected () A, current transformers, B, voltage transformers, C, motors, D, resistors 29 、 on the distribution line with short-circuit protection, the rated current of fuse is not greater than the long-term allowable load current of the circuit A, 0.4 B, 0.8 C, 1.25 D, 2.5 30. The insulating material is divided into seven grades according to the allowable maximum operating temperature under normal operating conditions A, Y, A, E, B, F, H, G, B, A, B, C, D, E, F, G, C,, B, G, C, D, E, F, and H 31. Explosive mixture of minimum detonation current (electric spark) less than 70 Ma is () A, I, B, II, C, III, D, IV 32, tube type lightning arrester grounding resistance shall not be greater than () Europe a、30 b、4 c、10 0.5 33、网眼遮栏与裸导体的距离应符合规定, 对于10kv的设备, 其最小安全距离为 () 米 a、 0.35 b、0.6 c、0.7 d、1 34、发生人身触电事故或火灾事故, 值班人员 () 断开有关设备的电源以进行抢救 a、不经联系立即 b、填写工作 c、工作向上级汇报 35、线路或设备停电检修时, 临时性接地线应使用 () a、截面不小于16平方毫米的多股裸软铜线 b、截面不小于25平方毫米的多股裸软铜线 c、截面不小于25平方毫米的铜芯绝缘线 36、安装灯头时 () a、开关必须安装在火线上 b、灯口螺纹安装在火线上 c、不作明确要求 37、梯子与地面的角度应保持在 () 左右 a、70度 b、60度 c、45度 d、50度 38、用户新装或增加用户电, 应按国家有关规定, 向供电局交纳 () a、电费 b、帖费 c、手续费 d、补偿费 39、根据《供电营业规则》规定, 用户单相用电设备容量不足 () kw的可采用220v电压供电 a、3 b、5 c、10 d、7 40、根据《供电营业规则》规定, () 公用高压线路供电的, 以用户分界处或配电室前的第一断路器或第一支持物为分界点, 第一 断路器或第一支持物属供电企业 a、10kv及以下 b、35kv及以上 c、100kv d、20kv及以上 41、下列单位中, 哪一个是电功率的单位 () a、千瓦小时 b、度电 c、焦耳 d、马力 42、已知电路中a点的电位为5伏, ab两点的电压uab = - 10v, b 点电位为 a、5 b、15 c、10 d、 - 15 43、成年男性触电后能自主摆脱电源的最大电流为 () a、约1ma b、9ma c、约100ma d、约1ma 44、已知正弦交流电流i = 10sin (314t + 30?) 安, 其电流的相位角为 () a、30? b、314 + 30? c、10弧度 / 秒 d、sin (314t + 30?) 45、在三角形联接的三相对称交流电路中, 相电流和线电流, 相电压 和线电压的关系为 () a、相电流 = 线电流, 相电压 = 线电压 b、相电流 = 线电流, 相电 压 = 线电压 c、?3相电流 = 线电流, 相电压 = 线电压 d、相电流 = 线电流, 相 电压 = 线电压 46、计算电动机同步转速应用 () 公式 a、n1 = 60f / p b、n1 = 60p / f c、n1 = 60fp 47、下列单位中, A, grounding the metal conductor without electricity, B, neutralizing C, increasing air humidity, D, coating antistatic agent E, process control 13, for rotating electrical equipment fire extinguishing, fire extinguishing agents can be used A, dry powder extinguishing agent B, 121 extinguishing agent C, carbon dioxide D, sandy soil E, carbon tetrachloride 14, live loading and unloading pipe should be done () A, wear protective goggles, B, wear insulated gloves, C, insulated clamps D, stand on insulated pads, E, and wear insulating boots 15, the technical measures to ensure safety are () A, power failure B, fill in the operation ticket C, check the electric D, take down the fuse E, install the ground wire F, hang the sign and temporary shelter 16. Ensure the safety of electrical work A, power cut measures, B, organization measures, C, power check measures, D, technical measures, E and transmission measures 17, three-phase asynchronous motor according to the structure of the rotor type can be divided into () A, convex pole type B, squirrel cage type C, wound type D, shaded pole E and concealed polar type 18. The characteristics of parallel circuits are A, withstand the same voltage, B, flow through the same C, current and resistance is proportional to D, power and resistance is proportional to The total resistance is always greater than the resistance of the E 19. In the pure inductance AC circuit, the following conclusions are correct A, voltage and current is proportional to, B and do not consume active power C, voltage lead current 90 degrees D, voltage hysteresis current 90 degrees E and absorbed reactive power 20. The symmetrical circuit of three phase triangle connection has the following characteristics A and line currents are equal to phase current B, line voltage equal to phase voltage C, line current equal to phase current D, line current hysteresis phase current 30 degrees E, line current lead phase current 30 degrees Three 、 judgment questions 1, electric shock is electric shock, can be divided into direct electric shock and indirect shock two kinds () 2, electrical equipment should be discharged before and after electrical test on a capacitive device 3. The distance between the mesh barrier and the bare conductor shall be no less than 0.15m for the low voltage, and the equipment for 10KV shall be no less than 0.35m () 4, the zero line has the work zero line and protects the zero line the cent () 5 、 after installing the three-phase leakage protection switch, the fuse can no longer be installed 6, the insulation resistance of insulation material is bigger, the insulation performance is better 7, work insulation is to ensure the normal operation of equipment and prevent electric shock insulation () 8, to prevent high pressure into the low risk level of the three-phase voltage transformer voltage side are connected to ground (midpoint) 9. The function of protective earthing is to limit the earth voltage of the leakage equipment to the safety voltage 10, in the network insulation damage caused by sparks will cause explosion in the dangerous place, should use the grounding grid ()