高级汽车修理工试卷(Senior auto mechanic paper )

高级汽车修理工试卷5（Senior auto mechanic paper 5）

1. Select the correct answer, and fill in the corresponding letters in brackets.

1. In the actual cycle, the process of replacing the ideal cycle with the heat and heat process is ().

(A) ventilation process (B) air intake process (C) exhaust process (D) compression process

2. Reasonably determine the purpose of the distribution phase is to ().

(A) to increase the amount of air intake (B) to exhaust the exhaust gas

(C) A and B (D) improve engine economy

3. In order to improve the aeration coefficient, the resistance of the intake system should be reduced, in the whole intake system, the minimum of the cross section of the () and the constant change of the flow resistance should be considered first.

(A) intake valve (B) carburetor (C) inlet pipe (D) air filter

4. The optimum ignition advance Angle increases with the speed of rotation ().

(A) increase (B) constant (C) decrease (D) decrease first and then increase

5. When the engine is working, if the ignition switch is cut off, the engine can still be on fire, which may be caused by ().

(A) surface ignition (B) detonation (C) high voltage (D) mixture is too thick

6. In the combustion process, the highest temperature formation point is ().

(A) ignition period (B) (C) delayed combustion period (D)

7. One of the main reasons for diesel engine exhaust black smoke is ().

(A) the injection time is too early (B) the injection time is too late

(C) the amount of fuel injection is too small (D)

8. The effective indicator for evaluating engine economy is the effective fuel consumption rate and ().

(A) effective power (B) effective thermal efficiency (C) effective torque (D) effective pressure

9. The car engine should be kept under () and its torque and power are both large and low in fuel consumption.

(A) high speed (B) medium speed (C) low - speed (D)

10. Which of the following statements is correct according to the preangle adjustment characteristics of the ignition?

(A) the optimum ignition advance Angle increases with the increase of rotational speed (B) the optimum ignition advance Angle decreases with the increase of the rotational speed

(C) the optimal ignition advance Angle increases with the load and (D) the optimum ignition advance Angle decreases with load

The more gearboxes, the more likely the engine will be closer to () when the engine is closer to ().

(A) maximum torque (D) maximum traction of maximum torque (C)

12. The radial and off-road tread tires have a better drive because of the obvious improvement of the tire.

(A) radius (B) pressure (C) stiffness (D) adhesion

13. The braking distance refers to the distance that the car goes by when the emergency braking, from () to completely stop.

(A) the driver receives the signal and realizes that the driver

(B) is stepping on the brake pedal when it is needed

(C) when the driver loosens the gas pedal (D) the brake works

14. When braking, the driving force of the steering wheel brake is not equal, causing ().