电气控制核心技能理论知识试卷3（Electrical control, core skills, theoretical knowledge, test paper 3）.docVIP

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电气控制核心技能理论知识试卷3（Electrical control, core skills, theoretical knowledge, test paper 3）.doc

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电气控制核心技能理论知识试卷3（Electrical control, core skills, theoretical knowledge, test paper 3）

电气控制核心技能理论知识试卷3（Electrical control, core skills, theoretical knowledge, test paper 3） Electrical control, core skills, theoretical knowledge, test paper 3 Matters needing attention 1, examination time: 90 minutes. 2. First of all, please fill in your name, ticket number and the name of the unit in the enclosed form of the test paper. 3. Please read the questions and answers carefully. Fill in your answers in the prescribed places. 4, dont write on the paper drawing, do not fill in related content in standard seal area. One or two total score Score Score Raters I. individual choice questions (first questions ~ eightieth questions). Choose a correct answer and put the corresponding letters into the brackets in the questions. 1 points per game, 80 points. ) When the main contact point of 1. (or) is broken, the three-phase shall ensure simultaneous on-off, and the sequence error shall not exceed 0.5ms. A, contactor B, intermediate relay C, thermal relay D, undervoltage relay 2. when the ambient temperature of the thermal relay varies with the ambient temperature of the motor, the correction value is approximately 10%. A, 5-20, B, 10-20, C, 15-20, D, 18-20 3. electromagnetic relay detection and requirements, for general bridge contact, normally open contact distance is not less than (). A, 1.5mm, B, 2.5mm, C, 3.5mm, D, 4.5mm 4. the operation value of over current relay is adjusted, and the DC relay should be adjusted according to the 110%-115% of the maximum working impulse of the motor. A, resistor B, voltage C, current D, capacitance Setting 5. time relay, time relay delay in general below 3S (time), by using the method of time delay contact relay control to remember the time. A, B, C, electric watches stopwatch stopwatch D, other 6. when the contacts of low voltage breaker contacts exceed the thickness of 1/3 or exceed, the new contacts should be replaced. A, 1/5, B, 1/4, C, 1/6, D, 1/2 7. overhaul CA6140 lathe, the spindle can start, but not self-locking, then check