汽车维修技术（Automobile maintenance technology）.docVIP

汽车维修技术（Automobile maintenance technology） 1. on the same axle, two wheel brake, brake shoe return spring tension difference is too much, will cause (B). A. brake power is not enough, B. braking deviation C. brake is not working, D. can not brake 2. when the engine works, the valve produces a rhythmic, continuous knock because (D). A. fires too early and B. fires too late C. valve clearance is too small, D. valve clearance is too large 3. engine oil without oil pressure is due to (C). A. main oil pressure regulating valve spring compression force is too large, B. crankshaft each bearing clearance is too small C. oil in the oil pan bottom is too low, D. oil viscosity is too large 4. when the hydraulic brake automobile is in motion, when continuously treads the brake pedal, each wheel does not have the braking function, possibly is because (B). A. brake pedal free travel is too large, B. brake master pump without oil C. brake drum out of circle, D. brake fluid temperature is too high 5., when the engine is in the middle speed, the noise is most obvious, the noise has rhythm, when the middle speed changes the speed, the sound changes along with it, may diagnose (D). A. piston knocking, B. piston pin knock C. crankshaft, main bearing, noise, D., connecting rod, bearing, noise 6. the crankshaft position sensor is the main signal source of control (C) in electronic control system. A. air flow, B. injection quantity, C. speed, D. ignition time 7. general car overhaul, ex factory road test conditions are: loading 75% of the specified load on the hard road, speed per hour is not more than (B) km/h driving 15km. A. 25, B. 30, C. 40, D. 50 8. when the engine starts, the clutch has a noise, and when the pedal is lifted, the noise disappears because of (C). A. clutch release lever wear loose. B. pedal return spring does not stretch enough C. clutch release bearing, missing oil, D. clutch, friction plate, rivet loose 9. vehicle (B) is a new car or after major repair, after driving