Jinbi property electrician examination questions

1 volume

I. Multiple choice questions

1. When the outdoor temporary line crosses the road, it should be () meters high (a, 2.5b, 3.5c, 4.5d, 6.2) to ensure safety. When laying buried gas pipeline, the wall thickness should not be less than ().

A.2.5 B.3mm C.3.5 D.4mm 3 Use hand-held power tools in places with fire and explosion hazards ().

A. No B. No C. Use it as little as possible or not D. There are no specific rules. 4. When the conductor is laid through the pipe, the total cross section of the conductor shall not exceed () of the cross section inside the pipe.

A.20 B.40 C.60 D.80 5。 Contact protection of hand-held electric tools can be divided into ().

A. 1 B.2 C.3 D.4 6 When the electrocuted person is not breathing and mouth-to-mouth resuscitation is needed, the number of blows per minute should be (). A.10b.12c.18d.60 7. When laying electric conduit, the bending radius of open pipe should not be less than () times of pipe diameter.

A.6 B.8 C. 10 D. 15 8。 Electrical operation () High-voltage equipment is charged.

A. Allow B. Don't allow C. Work with the consent of the leader. 9. When using steel pipe as underground artificial grounding body, its wall thickness should not be less than () mm. 。

a . 1.8b . 2.5c . 3.5d . 4.0 10。 In order to reduce the shielding effect of adjacent grounding bodies, the distance between vertical grounding bodies should not be less than () of their length. Times: a.1B.1.5c.2d.311. Where there is dust or fiber mixture, the surface temperature of electrical equipment shell should not exceed (). Degree. a . 100 b . 125 c . 150d . 200 12。 Different frequencies of current have different degrees of harm to human body. Alternating current in the range of () is the most harmful to human body. A. 1000 Hz, b. 25 Hz, C. 25-300 Hz, D. Especially 13. When sending electricity, the sequence of disconnectors is ().

A. put the bus side first, and then put the line side. B put the line side first, then the bus side. C. Just close 14 at the same time. The distance between temporary lines and equipment, water pipes, hot water pipes, doors and windows should not be less than () meters.

a . 0. 1b . 0.5c . 0.6d . 0.3 15。 The damage caused by current to the internal tissues of human body is called ().

A. electric shock B. electric shock C. electric shock 16 Running transformer should do () simplified experiment every year.

A. 1 B.2 C.3 D.4 17。 The minimum area of low-voltage overhead copper wire is () square millimeter.

a . 6b . 10c . 16d . 25 18。 The maximum value of three-phase unbalanced current of transformer should not exceed () of rated current.

a . 5% b . 10% c . 25% d . 15% 19。 In order to prevent arcing, () should be taken.

A. first pull the middle phase, and then pull the two sides. B. first pull the two phases on the side, and then pull the middle phase. C. Pull from left to right in turn. D. In no particular order. 20. Each single-phase loop of the lighting circuit should not exceed (𕬸 𕬸) a..

a . 10b . 15c . 20d . 30 2 1。 The line or equipment is equipped with a quick-break protection device to prevent electric shock. The allowable current of human body can be considered as (). A. 10 mA B.30 mA C. 15 mA D. 1000 mA 22. When working on the circuit of the capacitor bank, the capacitor should be ().

A. discharging B. disconnecting C. discharging one by one and grounding D. isolating 23. Transformers must be checked before the first parallel connection.

A. voltage B. current C. phase sequence D. shape 24 The national power supply regulation stipulates that the power factor of high-voltage users must be guaranteed at ().

A.0.8 above B.0.85 above C.0.9 above D.0.95 above 25. Electrical equipment on the infrastructure construction site, such as pile drivers and mixers, and electrical equipment on temporary lines must be installed ().

A. leakage protector B. fuse C. thermal relay D. time relay 2

26. The main cause of death by electric shock is the physiological reaction caused by human internal tissues. A. Current B. Voltage C. Power frequency D. Resistance 27. Different frequencies of current do different harm to human body, and alternating current within () is the most serious harm to human body.

A./kloc-above 0/000 Hz C. above 25 Hz C. above 25-300 Hz C. 25. When a blowtorch is used near high-voltage equipment, the distance between the flame and the live part is below 10KV. Not less than () m.a.1b.1.5c.3d.4.5 29. Chest compressions squeeze the lower part of the cavity with a depth of () cm.

A. 1~2 B.2~3 C.3~4 D.4~5 30。 The voltage of the traveling lamp shall not exceed () volts.

A. 12 B.24 C.36 D.48 3 1。 The protective grounding resistance of low-voltage electrical equipment should not be greater than () Ω.

A. 10 B.0.5 C.30 D.4 32 As the main component for detecting leakage signals, the leakage protector is zero sequence ().

A. voltage transformer B. leakage motor C. current transformer D. fuse 33. According to the common sense of fire equipment, when the concentration of carbon dioxide in the air reaches (), it will suffocate people.

10% C. 15% D.20% 34。 In order to reduce the shielding effect of adjacent grounding bodies, the distance between vertical grounding bodies should not be less than () times its length. A. 1.5 B.2.0 C.2.5 D.3.0 35。 There are many measures to prevent electric shock accidents, among which () is the most significant.

A. Choose appropriate electrical products B. Do a good job in equipment maintenance C. Strictly implement safety operation procedures D. Carry out education on safe electricity use. When there is wind, open the drop fuse to prevent electric arc ().

A. first pull the middle phase, and then pull the two sides. B. first pull the two phases on the side, and then pull the middle phase. C. Pull one by one from the downwind position. Part by part. 37. The conductor connected to the grounding neutral point is called ().

A. Zero line B. Neutral line C. Protective zero line D. Working zero line

38. When using Class I hand-held power tools, a leakage protector with leakage action current not greater than () mA and action time not greater than 0. 1S must be installed. a . 15b . 30c . 50d . 100 39。 The insulation resistance of the secondary circuit of the switchboard shall not be less than () mω.

A. 1 B.0.22 C.0.5 D.2 40。 The maintenance channel of power distribution equipment is generally not less than () meters.

a . 0.5b . 0.8c . 1.0d . 1.2 4 1。 The installation and removal of grounding wire should be carried out by () people.

42. Article 3, paragraph 4 (e). In metal containers or wet places, the voltage of portable lamps shall not exceed () volts.

A. 12b.24c.36d.48 43。 () Lights should be used in damp places.

A. dustproof B. light mold C. open D. moisture-proof 44 For the purpose of preventing electric shock, it is recommended to choose a leakage protector whose action time is less than () seconds.

A.0.5 B.0.3 C.0. 1 D.0.25 45。 When there is a fire in electrical equipment, you should first ().

A. remedy with a non-conductive fire extinguisher B. turn on the isolating switch C. turn on the oil switch or automatic switch D. there is no specific provision.

46. General residential office, if the main purpose is to prevent electric shock, should choose action current for () mA, action time for 0. 1S leakage protector.

47. From the safety point of view, the distribution line power failure should be disconnected ().

A. knife switch B. leakage switch C. air switch D. master switch 48. 10 kV and below, the minimum safe distance between charged body and human body is ().

A.0.25 B.0.35 C.0.5 D.0.7 49 Live equipment can only be operated when the staff () or the power supply should be cut off.

A. front side B. rear side C. left and right side D. there is no specific provision. 50. When a blowtorch is used near high-voltage equipment, the distance between the flame and the live part shall not be less than () if it is above 10KV.

Two. Multiple choice questions (20 questions, 2 points for each question, ***40 points)

The rating of safe voltage in China is 42 volts and below ().

A.36 B.24 C. 12V D.6V 2。 Leakage protector must be installed in the following places ().

A. Humidity B. High temperature C. Places with high metal and coefficient D. Places with good conductivity E. General places 3. Low voltage equipment power outage maintenance, technical measures to ensure safety are ().

A. Power outage inspection B. Work ticket system C. Work permit system D. Installation of grounding wire E. Hanging signs and installing fences 4. When there is a fire in electrical equipment, the commonly used fire extinguishing equipment is ().

A. carbon dioxide B. dry powder C. water D. carbon tetrachloride 5 Electrical devices in explosion and fire hazards shall comply with the following safety principles ().

A. the rated voltage of cables and insulated conductors shall not be lower than the rated voltage of lines, and shall not be lower than 500 v.

B. insulated wires must be laid in steel pipes. C all electrical facilities shall be protected against overload and short circuit. D. When pipeline wiring is adopted, galvanized water pipes and gas water pipes should be adopted, and their thickness should not be less than 2.5 mm. E. Joints are allowed in the pipes.

6. Pay attention to () when measuring the current of lines and equipment with a clamp meter.

A. the power supply must be cut off. Select the appropriate range file. C. Do not switch range files during measurement. D. Don't use the clamp meter to measure the current of the high-voltage circuit. You can't measure the current of a bare conductor. 7. Low voltage equipment or line power failure, technical measures such as () must be taken to ensure safety.

A. Power outage B. Power outage inspection C. Installation of grounding wire D. Hanging signs and installing temporary shelter 8. Belong to the level of load users is ().

A. sudden power failure will cause personal injury. B. sudden power failure will cause a lot of raw materials to be scrapped. C. sudden power failure will cause major equipment damage, which is difficult to repair. D. sudden power failure will cause a large reduction in production. E. there are two independent power supplies. 9. The electrician on duty in substation (substation) should be familiar with and implement the rules and regulations such as ().

A. Operating rules B. Safety rules for aerial work C. Safety work rules D. Handover system E. Relevant regulations on substation maintenance and test 10. Protective measures for charged metal parts other than touching generally include ().

A. protective grounding B. protective connection to zero C. protective disconnection D. installation of leakage switch 1 1. Three-phase four-pole automatic leakage switch has ().

A. short-circuit protection function B. leakage protection function C. overload protection function D. undervoltage and undervoltage protection function 12. When there is no heartbeat or breathing, when there is a phenomenon such as (), it is judged that the person who gets an electric shock is really dead.

A. mydriasis B. joint stiffness C. lividity D. close your eyes 13 The safety of electrical equipment should consider the following factors ().

A. shockproof B. dustproof C. arson D. moistureproof E. electric shock prevention 14 The basic requirement for fuel is ().

A. there are combustible substances B. there are combustion-supporting substances C. there are fire sources D. there are oxygen promoters 15. The lighting voltage of the following () places shall not exceed 36V safe voltage.

A. install lamps with a height of less than 2.5m in dangerous places. B. underground lighting in coal mines. C. portable lighting in general places or wet places. E. local lighting on machine tools. F. underwater lighting 16. Electric shock injury has the characteristics of ().

A. the current is very small. B. the voltage is not high. C. current flows through the human body for a long time. D. there is no obvious damage to the human body surface. 17. Pay attention to () when the maintenance equipment needs power failure.

A. completely disconnect all aspects of power supply. B. Open the circuit breaker to make at least one obvious disconnection in all aspects.

C it is forbidden to work on equipment that only turns off the power supply. D transformers and voltage transformers related to power failure must be completely disconnected from the high and low voltage sides of the power supply. E. the operating handle of the circuit breaker must be locked at 18. Leakage protector according to the load power supply mode can be divided into ().

A. single-phase B. two-phase C. three-phase three-wire D. three-phase four-wire 19. The electrician on duty should strictly implement the system such as ().

A. Patrol on duty B. Switching operation C. Work order D. Handover E. Safety appliances and fire equipment management 20. Power capacitors should stop running under the following circumstances ().

A. line voltage exceeds rated voltage 10%. B line current exceeds rated current 10%. C. oil leakage. D. flashover and abnormal sound.

Three. True or false questions (10 questions, each 1 minute, * * *1minute)

1. The knife switch of the distribution box is allowed to open with load. () 2. When the electrical equipment is on fire, it is forbidden to put out the fire with water. ()