2010年电工试题（Electrical examination questions in 2010）.doc

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2010年电工试题（Electrical examination questions in 2010）.doc

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2010年电工试题（Electrical examination questions in 2010）

2010年电工试题（Electrical examination questions in 2010） I. judgment questions 1, it is customary to specify the direction of positive charge motion as the positive direction of the current. (A) A correct, B error The intersection point of 2 or three or more branches is called a node three. (A) A correct, B error 3, the phenomenon of inductance and mutual inductance is essentially different. (B) A correct, B error 4 the effective value of alternating current does not change with time. (A) A correct, B error 5, reactive power is used to reflect the scale of power and magnetic field conversion in a pure inductance circuit. (A) A correct, B error 6, three-phase four wire system voltage is 380 / 220V, which means that the line voltage is 380V, the phase voltage is 220V. (A) A correct, B error 7, in the air and water shocks, take 5mA as a safe current. (A) A correct, B error 8, the environmental temperature increased to 40 degrees, it will cause insulation aging and cause accidents. (B) A correct, B error 9, leakage protector after failure should be replaced in a timely manner, and by professional repair. (A) A correct, B error 10, repeat the location, the more serious the harm of electric shock, or vice versa. (a) A correct, B error 11, live fire extinguishing should use foam and dry powder fire extinguisher. (b) A correct, B error 12, low-voltage electrical appliances are divided into two categories of control and switching appliances. (b) A correct, B error 13 switch switch in the front is best equipped with knife switch and fuse. (a) A correct, B error 14 、 the power cable is mainly composed of cable core conductor, terminal joint and intermediate joint. (b) A correct, B error Class 15 and class I tools are safer and more reliable than class II tools. (b) A correct, B error 16, in the neutral ungrounded power supply system, class II tools should take protective grounding. (b) A correct, B error 17, when the motor capacity is small, can use full pressure start. (a) A corre