Common sense of electric power safety
When 1, electric equipment produces fire, can which a few kinds is the equipment of electrified put out a fire?
Answer: 1211 carbon dioxide powder of 4 chloridize carbon (the answer calculates 2 kinds right)
2, produce frequency to look by accident getting an electric shock, among a year accident of which a few month most concentration?
Answer: 6~9 month
Is 3, safe voltage highest how many bend over be?
Answer: 42 bend over
How much is the provision of 4, safe dc electric current that adopts person the following?
Answer: 50mA
How much is the provision of 5, communication security electricity that adopts person the following?
Answer: 10mA
6, get an electric shock when urgent rescue law, what should undertake above all? What to undertake instantly next?
Answer: Touch electric rescue; Breathe artificially.
A few kinds does the protector that 7, our factory prevents to hit thunder continuously have?
Answer: Lightning rod; Avoid thunder net; Disappear Lei Qi.
When ground connection of 8, electrical wiring, dot of ground connection of human body distance is closer, step voltage is taller, the distance is further, step voltage is lower, be apart from ground connection body usually how many, step voltage can be regarded as 0. A: B of 10m less than: Beyond 20m C: Beyond 30m
Answer: B
Electrography of 9, low-pressure check is applied to commonly hand in, volts d.c. is () V is the following.
A: 220 B: 380 C: 500
Answer: C
Of establishment of illume of site of 10, construction receive what report should adopt to prevent measure getting an electric shock to be () .
A: Wear B of electric insulation glove: Dump C: The station is on insulation board
Answer: B
11, by tip-and-run person whether be rescued, the key depends on ()
A: The means B that get an electric shock: The size of human body resistor
C: The D of on any account of voltage getting an electric shock: Whether break away from as soon as possible power source and apply close emergency treatment is protected
Answer: D
Is those who eliminate cop to go up electrostatic and 12, main good what be to do?
Answer: Ground connection
13, what calls safe voltage?
Answer: Below all sorts of different ambient conditions, after human body bring into contact with has the electrical body of constant tension, its are organized partly each (if the skin, heart, dirty, respirator official is mixed neurological etc) when producing any harm, this voltage weighs safe voltage.
What does electric current of 14, influence harm the main factor of degree to have to human body?
Answer: Main factor has: Voltaic size, human body resistor, the accident of weld time, voltaic frequency, the discretion of voltage, voltaic way, human body state.
The 15, electromotor in moving stops the recrudesce after machine to move, does heat allow to start below hot condition how many times? Allow to start continuously below cold condition how many times?
Answer: 1; 2~3 second
16, construction uses electromotor instrument device, the safeguard that should use is?
Answer: Must use protection to receive 0, iterative earth still answers in the meantime.
Which two shares does 17, electric safety precaution have?
Answer: Organize measure and technical measure.
What does the 18, main method that breaks away from low-pressure power source have?
Answer: (1) dump; (2) cut off power supply cord; (3) carry pull power supply cord;
(4) pull open the person that get an electric shock; (5) take step of corresponding relieve a sick or injured person.
The attention when taking above step must use the insulation tool that accords with corresponding voltage grade.
What is the order that switch-disconnector throws when 19, power transmission?
Answer: Add up to bus side first, hind add up to circuit side.
The brake knife switch of box of distribution of 20, motivation can be pulled open with taking negative charge.
Answer: Not OK.
21, when explosion and fire man-trap use hand-held or movable type report to use a tool, what kind of dynamoelectric tool must use?
Answer: Have explosion proof measure.
Place of wet work of 22, Fan Zaichao or use inside metallic container portable when dynamoelectric appliance or floodlight, full voltage of how many volt-ampere should use?
Answer: 12V.
23, electromotor tries when machine, can you stop machine pushbutton with starting to be pressed immediately? Why?
Answer: Not OK. The 6~7 that starting electric current is rated electric current times, stop an opportunity immediately burned-out switch.
The electromotor of 24, my factory is explosion proof electromotor mostly, what is explosion proof grade commonly?
Answer: DIIBT4
The explosion proof electromotor of 25, my factory, be waterproof electromotor?
Answer: Either
26, when craft bear did not achieve rated bear, electromotor won't pass negative charge, right? Why?
Answer: Incorrect. Breakdown of pump of medium change, machine, electric machinery breakdown all can have caused load.
27, why to run igneous bill, do not allow to receive with electric bill temporarily temporarily report?
Answer: Belong to those who produce scintilla to use phone with report temporarily, easy cause accident of safety getting an electric shock, easy cause accident of on fire explosion, must handle igneous bill, use electric bill temporarily, take certain safety precaution to construction site, just can receive temporarily report.
The equipment using phone of circuitry of 28, indoor illume, how many KW should the total capacity of each loop exceed? (1) 1; (2) 2; (3) 3.
Answer: (2)
29, electrical outlet the capacity should suit with photograph of the bear that use phone, does each electrical outlet allow to receive only with a few appliance?
Answer: 1
Relative humidity of 30, workplace is more than 75% when, criterion this work environment belongs to easy the environment that get an electric shock: (1) dangerous; (2) special risk; (3) general
Answer: (1)
31, cause an accident to prevent electrostatic scintilla, always use the treatment, keep in storage, equipment metal that carries system of all sorts of combustible gas, fluid, pink canal, non-conductive n material is in charge of must
(1) have enough great resistance; (2) have enough little resistance; (3) ground connection
Answer: (3)
The power source down-lead of 32, dynamoelectric tool, among them line of olivine double color should be used as the line. (1) ; (2) the job 0 lines; (3) protect ground connection.
Answer: (3)
The 33, measure that makes sure safety of person of electric overhaul staff is the most effective is.
(1) pensile nameplate; (2) set barrier; (3) will overhaul equipment ground connection and short circuit.
Answer: (3)
34, consider from safe angle, equipment power failure must have apparent -- .
(1) nameplate: (2) ground connection place; (3) disconnect dot.
Answer: (3)
35, equipment or circuitry admit really without report, answer to serve as a basis in order to indicate.
(1) volmeter; (2) electroscope; (3) disconnect signal.
Answer: (2)
36, switchboard (box) , do not get near all sorts of electric equipment such as switch, transformer. (1) set put fire extinguisher; (2) install crawl;
(3) pile up explode combustibly, easily, moisture and the thing that other influence handles.
Answer: (3)
Place of residence of 37, average resident, office, when if get an electric shock in order to prevent,be main purpose, the leakage of electricity that should choose electric current of movement of leakage of electricity to be MA protects switch.
(1) 6; (2) 15; (3) 30.
Answer: (3)
38, movable type is dynamoelectric tool and its switch board (box) power supply cord must be used. (1) double deck is plastic lead of cupreous core insulation; (2) double stranded cupreous core is plastic flexible cord; (3) jacket of insulation of cupreous core rubber or cupreous core flexible cord of jacket of polyvinyl chloride insulation.
Answer: (3)
The length of down-lead of power supply cord of dynamoelectric tool should not exceed 39, movable type commonly rice. (1) 2; (2) 3; (3) 4.
Answer: (2)
Lay aside unused 40, for a long time to hold dynamoelectric tool, insulation resistance must be measured before use, requirement I kind hold dynamoelectric tool between electrified spare parts and crust insulation resistance not under M Ω . (1) 2; (2) 0.5; (3) 1.
Answer; (2)
41, what makes short circuit?
Answer: Short circuit is line of the look in pointing to electric circuit and look line, look line and 0 lines or earth, connecting overload or touch below the state of affairs with very little resistance, create the appearance that the electric current in electric return circuit raises in great quantities.
What harm does 42, short circuit have?
Answer: Short-circuit current makes short circuit place makes even whole circuit overheat, can make the insulation layer of lead upblaze, and all round ignition the combustible inside the building.
43, when moving the electric facility such as fan, floodlight and mobile electric welder, below what circumstance should undertake?
Answer: Dump.
Any 44, electric equipment are in did not identify when having report, uniform think, cannot touch blindly.
Answer: Have report.
How many degrees can the exterior temperature of tube of iodic tungsten of 45, 1kW amount to?
Answer: 500~800 Celsius.
46, why is incandescent lamp easy when opening the lamp bad?
Answer: Filament is cold, resistance is little, when firm electrify, electric current is big (it is about 10 times) after time is long, easy bad.
Both ends of 47, fluorescent lamp does not shine aglow, can you move continuously? Why?
Answer: Not OK. Right now electric current is more than rated electric current, can cause (1) filament is very fast ageing, attaint; (2) ballast temperature is exorbitant, can cause fire.
The alternating current with 48, identical voltage and dc, are which kind of harm to the person great?
Answer: Alternating current. Especially the alternating current of 50~60Hz.
49, electric equipment catchs fire, what is the step that must take above all?
Answer: Power cut.
50, in producing a course, get angry of plant emergency maintenance must not be near cable channel, why?
Answer: In case channel memory has can light gas to bring detonate to light.
51, electric equipment runs medium happening when what circumstance, operation personnel should adopt an emergency measures, actuate reserves aircrew, out of service is unusual aircrew, inform professional checks processing.
Answer: (1) load current provides a value suddenly more than or truly five admit to run state;
(2) electric machinery or switch appear suddenly high temperature or fume;
(3) electric machinery or other equipment become loose because of the component happen grind, produce noise or get angry star;
(4) mechanical and laden occurrence catastrophe failure or endanger electric security.
Origin: Network
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