中级汽车维修电工知识试卷(A).doc

中级汽车维修电工知识试卷(A) A fills up the topic. The battery is charged in (24) hours The maintenance of the battery should be used to remove the dust from the lead accumulator and keep the holes in the top of the accumulator. The silicon rectifier generator must be used with (the regulator) When starting the engine, the time of each start must not exceed (the 5s). The duration of the continuous start time shall not be shorter than (15s); For the third time in a row, it must be restarted after checking for troubleshooting and spacing (2min) The gap between the two poles is generally (0.6 to 0.8 mm). When the engine is switched on and off when the engine is started, the main cause is the ignition (too early) and the break of the contact between the electrical equipment (too big) 7. The transistor type regulator has the switch speed, (good regulating effect) and (simple), (small size), (weight), reliable (work) and convenient (maintenance), the radio interference of small advantages, widely used in modern car 8. Transistor switch function instead of the breaker contact, make the primary current without contact, to improve the ignition (primary voltage), effectively improve the ignition performance Common failures of generators, for reasons of not charging: connecting leads (breakers) or fan belts (skid) 2. Select the topic When the engine is low and medium speed normal, the fire is short of fire at high speed, the reason is (A). A. the break of the contact between the electrical appliances is too small and the spark plug is too large B. The break of the contact between the electrical appliances is too large and the spark plug is too small C. broken electrical appliances When the engine is out of fire, the ignition switch should be immediately (A) A. cut b. off c. keep 10min The polarity of the silicon rectifying engine and the lead battery must be identical, both for (A) the iron A. negative b. positive c. negative 4. The density of the electrolyte are generally (B) 15 ℃ A: 1.14