电工操作证试题二

电工操作证 试题 中考模拟试题doc幼小衔接 数学试题 下载云南高中历年会考数学试题下载N4真题下载党史题库下载 二 (two) First, individual choice questions 1, in order to prevent direct electric shock, indoor fence height should not be less than () meters A, 1.2 B, 1.5 C, 2.5 D, 3.5 2, when the cables cross each other, in order to ensure safety, high voltage cable lines should be in low voltage cables () A, B, C, left D, right above the main 3, in the line ah, equipment installed to prevent electric shock fast breaking protection device, the body's allowed current can be considered A, 10mA, B, 30mA, C, 1A 4. When lifting work is carried out near the overhead lines of 10KV, the minimum distance between the crane and the suspended object and the electrified body is () A, 5m, B, 2m, C, 1M, D, 0.7m 5, according to the TEC standard, three-phase four wire system belongs to () system A, TT, B, TN-C, C, TN-S, D, TN 6, the maximum unbalanced current of motor shall not exceed the rated current A, 5% B, 8% C, 10% D, 15% 7, lighting lines should avoid heating pipes, the distance should not be less than () cm A, 50 B, 30 C, 10 D, 20 8 、 on the line with overload protection, the conductor's long-term allowable load current shall be no less than (Times) of the rated current of the melt A, 0.4 B, 0.8 C, 1.25 D, 2.5 9. Explosive mixture can be divided into three stages according to minimum current, in which the minimum detonation current is (II) A, 120, B, 70--120, C, 70, D, 50 10, live fire extinguishing, prohibit the use () fire extinguishing agent to carry on A, foam B, dry powder C, carbon dioxide D, 1211 11, in order to protect the electric equipment from the invasion of lightning, the wave should be protected A, lightning rod B, grounding C, lightning arrester D, lightning arrester 12, when visiting electrical equipment, the distance between the human body and the live conductor should be in accordance with the regulations, and the minimum safety distance is 10KV meters for the following equipments A, 0.35 B, 0.6 C, 0.7 D, 1 13, working near live equipment, live equipment is allowed only in the staff (or), otherwise the power outage should be carried out A, posterior B, left C, anterior D, posterior 14 temporary installed electrical equipment must () A support the equipment with insulation, B, connect the metal casing to zero C, and connect the metal case to the ground 15, the minimum current value that can cause adult male sensation is () A, 1, 1mA, B, about 10mA, C, about 100mA, D, 1A 16 、 in the industrial and mining, the protection against static electricity is not more than () Europe A, 10 B, 4 C, 100 D, 0.4 17, the frequency of the current is different, the degree of injury to the human body is different, in the (range) of AC damage to the human body the most serious A, over 1000 Hz, B, 25 Hz, C, 25~300 Hz 18, low voltage electrical equipment protection, grounding resistance should not be greater than () Europe A, 10 B, 0.5 C, 30 D, 4 19 、 in three-phase four wire system, when the leakage protection is adopted, the zero line of the switch is repeatedly ground A, not B, must C, no regulation D, can 20, in the 220/380V grounding resistance grid, when a grounding occurs, if the body touches the ungrounded phase, the voltage that the body receives is close to (V) volts (grounding resistance is 12 euro, and the neutral grounding resistance is 4 Euro) A, 220 B, 260 C, 380 D, 0 21, repeated earthing is used in () power grids A, ungrounded neutral, B, neutral grounding, C, ground and ungrounded power grid 22, according to the provisions of GB3787-83, when the electrical equipment is selected more than (V) safe voltage, it is necessary to take direct contact with electrified body protection measures A, 42, B, 36, C, 24, D, 12 23 、 drop type safety device should be pulled when there is wind A, from the beginning of the wind position, pull B, from the next wind position began to pull C one by one, from the middle of the phase began to pull D, no specific provisions 24, the height of the neon light from the ground must not be less than (meters) A, 2.5 B, 3.5 C, 4 D, 4.5 25. The direct cause of fire in electrical operation is () A, current heat and electric spark or arc B, electrical equipment insulation aging C, electrical equipment insulation is breakdown 26, in the explosion danger place, in order to shorten the short-circuit duration, the minimum single-phase short-circuit current shall not be less than the rated current of the fuse of the line A, 4 B, 3 C, 5 D, 6 27, the power line before starting work, must first in the work site () A, one by one test B, hang ground wire C, hang mark D, install temporary shield 28 、 breaking the two circuit of the current transformer should be shorted first A, winding B with wire, using wire C and using short circuit pieces on the special unit 29, high voltage equipment grounding, indoor shall not be close to the fault point within 4 meters, outdoor shall not be near the fault point (within) meters A, 3 B, 4 C, 5 D, 8 E, 10 30, according to the "power supply business rules", the user power equipment capacity of less than 100KW, or with transformer capacity of () KVA or less, can use low-voltage three-phase four wire system power supply A, 50 B, 100 C, 150 D, 200 31, the body standing on the conductive ground, a part of the body touches the phase line, called () A, contact voltage, electric shock, B, single phase electric shock, C, two phase electric shock 32, in order to protect the direct electric shock, we can adopt () and other safety measures A, protection earthing, B, insulation, screen protection, C, overload protection, D, protection and zero connection 33, the leakage protection switch can generate the detection signal of leakage current. The core component is () A, electronic switch B, magnetic switch C, zero sequence current transformer D, test circuit 34, the terminal of the overhead lines, the branch length of more than (meters) of branch zero line should be repeated grounding A, 220 B, 250 C, 200 D, 150 35 、 in the three-phase four wire system, when the earth leakage protection is adopted, the zero line of the work passes through the iron core of the zero sequence current transformer A, not B, must C, no regulation 36. For vertical buried single grounding, the step voltage is 20 meters away from the ground A, big B, close to zero C, can not be ignored 37, in the 220/380 volt grounding grid, if a device uses ground protection, when the device has hit the shell, the voltage of all the zero connected equipment is () A, 0 B, 110 C, 220 D, 380 38. The difference between the voltage of the transformer high voltage side and the rated voltage shall not exceed A, 5% B, 10% C, 25% D, 15% 39, the motor voltage fluctuation shall not exceed the rated voltage A, 8%~10%, B, 5%~10%, C, 10%~15%, D, 3%~5% 40, according to GB3787-83, the insulation resistance of class II hand held electric tools shall not be less than () per trillion ohm A, 2 B, 7 C, 1 D, 0.5 41 、 the two side of the instrument transformer is grounded () A, to prevent open circuit voltage B, to prevent high voltage into the low-voltage hazard, C, prevent short-circuit current D, prevent direct shock 42, after 30 seconds discharge of power capacitor, the residual voltage is not more than (V) Volts A, 50 B, 65 C, 100 D, 80 43, generators and motors and other rotating electrical equipment fire, should not choose () for fire fighting A, 1211 fire extinguishers, B, spray water, C, dry powder or sand, D, carbon tetrachloride 44, an electric kettle power of 2KW, it in 30 minutes power consumption () degrees A, 6 B, 3 C, 1 D, 2 45, the direction of the current is () the direction of movement A, negative charge directional B, electron orientation C, positive charge directional D, conductive particle 46. An electric device that consumes P=1KW of active power. The voltage is 220 volts. When COS theta is 0.9, the current taken from the line is (a.) A, 5.05 B, 50.5 C, 505 D, 5050 47, an intermediate frequency heating power supply, the frequency is 1000HZ, then the current cycle is () seconds A, 0.1 B, 0.001 C, 0.0001 D, 0.01 48. The effective value of the known AC voltage is 220 volts, while the maximum is (V) Volts A, 400 B, 311 C, 220 D, 127 49. The phase difference of three-phase alternating current generated by three-phase AC generator is () A, 60 degrees B, 120 degrees C, 360 degrees D, 90 degrees 50, the voltage of the original side of the transformer A is inversely proportional to the number of turns, B is proportional to the number of turns, and C is proportional to the current Two, multiple-choice questions 1, the electric shock from the power supply, should pay attention to the following matters A, ambulance personnel can not directly use hand or wet objects for ambulance tools, B, prevent electric shock from the power supply may fall C, in the night should solve the lighting quickly D, should wait for medical personnel to rescue 2. The following materials belong to the insulating material A, glass, B, cloth, C, paper, D, mineral oil, E, ceramics 3, the choice of leakage protection switch, which of the following quota should be compatible with the line conditions? A, action current B, short circuit current C, overload current D, operation time E, knife gate pole number 4, the quality of insulation materials can be measured by the following indicators A, insulation resistance B, leakage current C, dielectric loss angle D, compressive strength 5. Safety earthing mainly includes () A, protection earthing, B, lightning protection earthing, C, work grounding, D, anti static grounding, E, shielding earthing 6, in the ungrounded power grid, a ground fault occurs with the following characteristics A, the grounding current is large, the phase voltage of B and ungrounded phase rises to line voltage C, and the fault may exist for a long time D, the grounding current is not large, the phase voltage of E and ungrounded phase approaches the phase voltage 7, zero line safety requirements are mainly () A, the same power supply network is not allowed to protect the ground and protect zero coexistence, B and zero line is not allowed to install over-current protection The neutral point of C and low voltage power supply must be grounded, D should be equipped with enough repeat earthing device 8, the following circumstances may cause the motor temperature rise too high, even smoke, burn () A, two-phase operation, B, interphase, turn to ground short circuit C, the current is seriously unbalanced, D, two-phase power failure E, the power supply voltage is too high or too low 9, the following places () belong to a highly dangerous environment A, boiler room, B, electroplating workshop, C, finished product warehouse, D and acid washing workshop 10, the safety of electrical equipment should take the following factors into consideration A, shockproof, B, dustproof, C, fire prevention, D, moisture-proof, E, anti electric shock 11. The performance parameters for determining the dangerous degree of dangerous articles are A, flash point B, ignition point C, spontaneous ignition point D, explosive detonation current E, detonation transmission capacity F, minimum detonation current 12. The following substances belong to flammable gases A, hydrogen, B, chlorine, C, carbon monoxide, D, methane, E, oxygen, F, acetylene 13, fire prevention and explosion of the main measures are A, reasonable use of electrical equipment B, maintain the necessary safety spacing, C, keep the necessary fire spacing, D, keep the electrical equipment running normally, E and keep the ventilation well 14, according to the neutral point of power grid operation, the power grid can be divided into () A, three-phase three wire network, B, grounding grid, C, single-phase grid D, three-phase four wire network, E, ungrounded grid 15. Do not pile up inflammable, explosive, damp and influence operating objects near the following electrical equipment A, power distribution panel B, distribution panel C, transformer D, switch E, socket 16, using a blowtorch should pay attention to the following items () A, do not use oil and gas leaking burner capacity shall not exceed B, volume 3/4 C, do not use alcohol lamp D, flame and live parts should be kept enough distance, E shall not ignite near live equipment 17, the use of lights should comply with the following requirements () A, the power supply voltage is not more than 42V B, the power supply voltage is not more than 36V C, the lamp holder and the lamp body are firmly combined, and the lamp head is not switched D, the outside of the bulb has metal protection net, E, the lamp body and handle should be strong and well insulated 18, sine quantity three factor means () A, maximum value B, frequency C, phase angle D, initial phase E and phasor 19. The physical quantity of a volt unit is (?) A, current B, voltage C, potential D, electromotive force E, resistance 20, inductive reactance has the following characteristics () A, the power supply frequency is larger, the greater the inductance B, in circuit equivalent to open C, the greater the power cycle, smaller inductance D, in circuit equivalent to short circuit of E, the higher the frequency, the smaller inductance Three 、 judgment questions 1, mesh barrier height should not be less than 1.7M, the lower part of the ground should be no more than 0.1M, mesh should be no more than 40*40mm2 () The minimum horizontal distance between 2 10KV overhead conductors and buildings is 2M, and the minimum vertical distance is 3M () 3, in the same insulation and normal operation conditions, in single-phase electric shock, the grounding grid is less dangerous than the ungrounded power grid 4, the protection of zero connection is the use of zero line equipment to touch the shell, leakage current to form a single-phase short-circuit, prompting protection device action, cut off the power supply 5 、 protective earthing is applicable to neutral ungrounded power grid 6 、 the low voltage compensation capacitor circuit is connected with the fuse in series, then the discharge circuit should not be set 7, 10mm2 section of the copper core plastic insulation line of the maximum safety margin is 65A () 8, according to GB3787-83, the insulation resistance of class III hand held electric tools should not be less than 1 megabytes 9, when the power transformer needs oil change, the high voltage side switch should be pulled open. () 10, the inspection of electrical equipment, shall not be any equipment operation or work ,