低压考试题1（Low voltage examination questions 1）.doc

低压考试题1（Low voltage examination questions 1） Low voltage electrical theory test paper A big problem to determine the problem (the total of 50 questions, each question 1 points out of 50 points. The correct choice is A and the wrong choice B 1. of the Regulations provisions of Beijing safety, production and business units should be in accordance with the national standards or industry standards for practitioners to provide free labor protection supplies qualified, can also be in the form of currency or other items to replace. X The current on each branch of the 2. parallel circuit is not necessarily equal. V 3. the resistance value of the equivalent resistance of the two parallel resistances is less than the resistance value of either of them. V 4. Kirchhoffs first law is the law of nodal currents, which is used to prove the law of the relationships between currents in a circuit. V 5. the difference of the initial phase of two sinusoidal alternating current with the same frequency is called phase difference. When the phase difference is zero, it is called in-phase. V 6. at rated voltage, 500W incandescent bulbs consume electricity within two hours of 1.0kW/h. V 7. Output Voltage Analog Multimeter measuring bridge rectifier circuit, rectifier anode should be the black pen. V The 8 trillion ohm meter is used to measure the DC resistance of windings. X 9. stresses that safety will hinder production to a certain extent. X 10. the new electrical work personnel may not work independently during the internship. V 11. illegal operation and error operation are the most common causes of electric shock accidents. V 12. when other conditions are the same, the closer the person is to the point of contact, the greater the step voltage that may be possible, and the less likely the contact voltage is. V 13. electric shock is the direct action of electricity on the human body. V 14. electric shock accident, the high voltage accident is more than the low voltage accident. X 15. the zer