Automobile maintenance intermediate exam question bank

Chapter III Auto Repair

1. multiple choice questions (only one of the following answers is correct, please fill in the serial number of the correct answer in brackets)

1. When measuring the straightness of the valve stem with a dial indicator, turn the valve stem once, and the swing difference () of the dial indicator is the straightness error of the valve stem. ( )

A. Maximum value

B. Maximum value

C. Half

D. double

2. Put the two V-shaped irons on the flat plate, put the valve stem on the two V-shaped irons, use the dial indicator contact to touch the middle of the valve stem, and rotate the valve stem once, and half of the dial indicator swing difference is the valve stem ().

A. flatness error

B. cylindricity error

C. parallelism error

D. straightness error

3. The roundness error is the difference between the maximum radius and the minimum radius of the same radial section ()

A. Maximum value

B. Maximum value

C. Half

D. double

4. () is half of the difference between the maximum radius and the minimum radius of the same radial section. ( )

A. flatness error

B. Roundness error

C. parallelism error

D. straightness error

5. () is half of the difference between the maximum radius and the minimum radius of different radial sections. ( )

A. flatness error

B. cylindricity error

C. parallelism error

D. straightness error

6. The method of flaw detection using liquid that can emit light under ultraviolet irradiation as detection component is ().

A. Fluorescent penetrant inspection

B. Magnetic flaw detection

C. Hydraulic flaw detection

D. Observation and flaw detection

7. For high-speed rotating parts with uneven mass distribution, () inspection should be carried out. ( )

A. Static balance

B. Force balance

C. Dynamic balance

D. speed balance

8. Parts that wear slightly after use and can be used without repair are called ().

A. originality

B. Parts to be repaired

C. Abandoned parts

D. Available parts

9. The heat treatment method of heating steel to a certain temperature, holding it for a certain time, and then cooling it in still air is called ().

A. inhibition

B. Tempering

C. heat treatment

D. normalization

10. The heat treatment method of heating steel to a certain temperature, holding for a certain time, and then rapidly cooling is called ().

A. inhibition

B. Tempering

C. heat treatment

D. normalization

1 1. The heat treatment method of heating the quenched parts to a certain temperature, keeping the temperature for a certain time, and then cooling them in the cooling liquid at a certain cooling rate is called ().

A. inhibition

B. Tempering

C. heat treatment

D. normalization

12. The heat treatment method of heating steel to the same temperature as quenching, holding for a certain time, and then slowly cooling in the furnace is called ().

A. inhibition

B. Tempering

C. heat treatment

D. normalization

13. () is the most commonly used coolant for carbon steel quenching. ( )

A. Water

B. oil

C. alcohol

D. antifreeze

14. () is the most commonly used cooling liquid for quenching alloy steel. ( )

A. Water

B. oil

C. alcohol

D. antifreeze

15. It is wrong to say that improving the surface hardness of parts is ().

A. carburizing agent

B. nitride

C. liquid carbonitriding

D. soaking

16. When testing engine cylinders, the difference between the diameters of each cylinder shall not exceed () mm. ..

A.0.025

B.0.05

C.0.075

D.0. 10

17. When boring and grinding the engine cylinder, the roundness and cylindricity errors should be less than () mm..

A.0.0025

B.0.005

C.0.0075

D.0.0 10

18. The flatness error of the transmission housing plane shall not be greater than () mm..

A: 0.05

B.0. 10

C.0. 15

D.0.20

19. The limit value of fit clearance between rolling bearing and transmission bearing hole is ().

A.0.025

B.0.05

C.0.075

D.0. 10

20. () of the engine piston ring will lead to the early fracture of the piston ring. ( )

A. the opening gap is too small

B. The light leakage is too small

C. The opening gap is too large

D. Excessive back clearance

2 1. The clearance between piston and cylinder wall is too small, which may lead to () bending deformation. ( )

A. piston pin

B. machine shaft

C. camshaft

D. connecting rod

22. There are impurities in the parts during the assembly process, which leads to the accelerated wear of parts. This kind of wear is called ().

A. Adhesive wear

B. Fatigue and wear

C. Corrosion and wear

D. Abrasive wear

23. Parts under the action of alternating stress, cause the phenomenon of surface peeling, known as ().

A. Adhesive wear

B. Fatigue and wear

C. Corrosion and wear

D. Abrasive wear

24. The reason for the failure of parts is wrong ()

A. Deformation

B. fatigue

C. handling

D. corrosion

25. The piston ring opening of Santana 2000JV engine should be staggered by () degrees.

A.60

B.90

C. 120

D. 150

26. The clearance between piston ring and ring groove of Santana 2000JV engine is () mm..

A.0.0 1—0.04

B.0.02—0.05

C.0.03—0.06

D.0.04—0.07

27. The axial clearance of the crankshaft of Audi 100 engine is () mm..

A.0.0 1—0.28

B.0.03—0.056

C.0.07—0. 19

D.0.020—0.38

28. The flatness error caused by warping deformation of clutch diaphragm shall be no greater than () mm..

A.0. 10

B.0.25

C.0.50

D.0.75

29. Santana 2000 clutch diaphragm warping deformation caused by () should not be greater than 0.5 mm.

A. flatness error

B. Roundness error

C. parallelism error

D. straightness error

30. Santana 2000 clutch output shaft nut tightening torque is () n m..

A.50

B. 100

C. 150

D 200

3 1 .santana 2000 brake shoe thickness inspection, its standard value is () mm.

A.2

B.3

C. IV

D.5

32. Santana 2000 brake shoe thickness inspection, its wear limit is () mm..

A. 1.5

B.2.5

C.3.5

D.4.5

33. Santana 2000 clutch pedal free stroke is () mm..

A.5 5

B. 10 5

C.20 5

D.30 5

34. Santana 2000 clutch pedal control force should be less than () n..

A: 52

B. 152

C.252

D.352

35. When using multimeter to detect the resistance of automobile alternator rectifier diode and excitation diode, it should be Ω ().

Twenty to fifty years old

B.50—80

C.80— 1 10

D. 1 10— 140

36. Santana 2000 car air conditioning refrigerant for ().

A.R 12

B.T 12

C.R 134a

D.T 134a

37. Santana ordinary car air conditioning refrigerant for ().

A.R 12

B.T 12

C.R 134a

D.T 134a

38. Santana 2000AFE engine camshaft axial clearance should be no greater than () mm.

A: 0.05

B.0. 10

C.0. 15

D.0.20

39. Santana 2000AFE engine valve and conduit clearance should be () mm.

A.0.0 1—0.02

B.0.02—0.04

C.0.04—0.06

D.0.06—0.08

40. The rated resistance of Santana 2000AFE engine injector is Ω ().

A.5.9

B. 10.9 0.35

C. 15.9 0.35

D.20.9 0.35

4 1. The running-in of the engine with gradually increasing no-load is called ().

A. Cold running-in

B. Hot running-in

C. Hot running-in with load

D. no-load hot running-in

42. Santana 2000 car brake pedal total stroke is not less than () mm..

A: 90

B. 180

C.270

D.360

43. When the engine is completed and accepted, the vacuum degree of the intake pipe should be within the range of () kPa when idling is required.

A: 57-70

B.67—80

C.77—90

D.87— 100

44. When the transmission is completed and accepted, the noise of each gear shall generally not be higher than () dB.

A.48

B.68

C.88

D. 108

2. True or false (please tick "√" for the following judgments, and "×" for the mistakes)

() 1. Due to the short inflation time and the influence of residual exhaust gas, the inflation coefficient is always less than 1.

() 2. Excessive free travel of the automobile brake pedal will lead to poor braking.

() 3. Insufficient automobile brake fluid will cause braking deviation.

() 4. Too much oil or wear on the friction plate of the automobile clutch will cause the clutch to slip.

() 5. There is no relative sliding between the friction plate, flywheel and pressure plate during the repeated use of the automobile clutch.

() 6. The diaphragm spring of automobile clutch is broken or worn too much, which will lead to incomplete clutch separation.

() 7. Excessive free travel of automobile clutch pedal will cause incomplete clutch separation.

() 8. The spring of the automobile clutch pressure plate is broken, which will cause the clutch to slip.

Chapter IV Judgment and Elimination of Automobile Faults

1. multiple choice questions (only one of the following answers is correct, please fill in the serial number of the correct answer in brackets)

1. The national standard GB/T 3845- 1993 stipulates that gasoline vehicles should detect the () content of harmful emissions.

A. Nitrogen oxides and carbon monoxide

B. Nitrogen oxides and hydrocarbons

C.CO and HC.

D. Sulfur dioxide and carbon monoxide

2.GB/T 3845-1993 "Idle Speed Law of Exhaust Pollutants from Gasoline Vehicles" stipulates that () analyzer should be used when detecting exhaust pollutants from gasoline vehicles.

A. Non-dispersive infrared gas

B. hydrogen flame ion type

C. chemiluminescence

D. filter paper smoke meter

3. When testing the exhaust of gasoline engine, the depth () of the sampling probe should not be less than 400 mm. ..

A. tubing

B. Air inlet pipe

C. ventilation pipe

D. exhaust pipe

4. When testing gasoline engine exhaust, the depth of the sampling probe inserted into the exhaust pipe should not be less than () mm. ..

A. 100

B.200

C.300

D.400

5. From the oil mouth, the sound is crisp and there is a loud "clang", which means ()

A. abnormal sound of connecting rod bearing

B. Abnormal sound at valve root

C. Abnormal sound of piston ring

D. abnormal sound of crankshaft bearing

6. The engine piston pin abnormal sound is a kind of ()

A. no rhythm

B. Muddy and rhythmic

C. Dull and rhythmic

D. rhythmic "da da"

7. When it is judged that the engine piston ring knocks, () can be injected into the cylinder. If the noise is reduced, the end gap may be too large.

A. a lot of engine oil

B. a small amount of engine oil

C. A small amount of diesel oil

D. a lot of gasoline

8. If the engine piston abnormal sound, low temperature noise, high temperature noise is small, is ()

A. Poor piston quality

B. Low oil pressure

C. bending deformation of connecting rod

D the gap between the piston and the cylinder wall is too large.

9. The engine valve clearance is too large, which makes the valve foot make abnormal noise, so () can be used as an auxiliary judgment.

A. plug gauge

B. Micrometer

C. wrench

D. dial indicator

10. Failure of transmission self-locking device will lead to transmission ()

A. out-of-order block

B. Automatic tripping stops

C. abnormal sound

D. unable to shift gears

1 1. When the car is driving at high speed, the transmission has obvious noise, and the noise is very clear when it suddenly accelerates, mostly ().

A. some gears are broken.

B. Shaft bending

C. pine key fit of sliding gear

D. Low oil and low quality

12. The rupture of the steel plate of the driven plate of automobile clutch will cause () abnormal sound.

A. Hold on

B. Broadcast

C. transmission shaft

D. universal transmission device

13. When the car goes uphill under heavy load, the engine can't turn, and at the same time it can smell coke. This failure may be ().

A. braking delay

B. Clutch slipping

C. the clutch is not completely separated.

D. the transmission is in gear

14. The transmission shaft is seriously sunken, which will cause the car to drive at high speed ()

A. abnormal sound

B. Vibration

C. Abnormal sound and vibration

D. Speed instability

15. When starting automatically, the car body shakes, and a "scraping" impact sound can be heard, which belongs to abnormal sound.

A. Hold on

B. Broadcast

C. transmission shaft

D. universal transmission device

16. The gear meshing clearance in a certain part of the rear axle of the automobile is too large, which will make the automobile circle at ().

A. downward

B. upward

C. accelerate

D. start

17. The idle bypass valve in the fuel injection system of electronically controlled engine is an important part of the system ().

A. Gas supply

B. Oil supply

C. control

D. air conditioning

18. In the electronic control engine system, it is () that detects the intake pressure.

A. idle bypass valve

B. Intake air pressure sensor

C. air filter

D. air inlet pipe

19. In the electronic control engine system, the sensor is used to detect the intake pressure.

A. Intake air temperature

B. Intake air pressure

C. crankshaft position

D. air flow meter

20. In the electronic control fuel system, the fuel pressure is adjusted by ().

A. fuel injector

B. Fuel burner

C. voltage regulator

D. oil pipeline

2 1. electronically controlled engine fuel injection system can achieve () high precision control.

A. air ratio

B. Ignition high voltage

C. load

D. angular velocity

22. In the electronic control engine control system, () stores the optimal fuel injection duration of the engine under various working conditions.

A. electronic control unit

B. Implementing agencies

C. Temperature sensor

D. voltage regulator

23. Compared with the traditional carburetor engine, the performance of the engine equipped with electronically controlled fuel injection system has been improved.

A. synthesis

B. Economy

C. motivation

D. load

24. The oxygen sensor can detect the oxygen content in the engine exhaust, input the air-fuel ratio feedback signal to the ECU, and calculate the fuel injection quantity ().

A. open-loop control

B. closed-loop control

C. ignition control

D. both open-loop and closed-loop control are available.

25. The reason why the gasoline engine can't start is ().

A. low-voltage circuit breaker

B. Insufficient oil supply

C.the mixture is too thin

D. The mixed gas is too strong

26. When the gasoline engine was started, there was no sign of fire. Check the oil circuit. The fault is ().

A. mixing and concentration

B. mixing and diluting

C. no oil

D. Insufficient oil supply

27. The idle speed of the six-cylinder engine is unstable. After unplugging the high-voltage line of the second cylinder, the running condition remains unchanged, and the fault is ().

A. The second cylinder

B. Adjacent cylinders

C. Central high-voltage line

D. the sixth cylinder

28. The fuel supply rod of diesel injection pump is controlled by ().

A. Managers

B. Oil quantity limiter

C. speed adjusting lever

D. connection

29. The plunger coupling on the fuel injection pump of diesel engine is ON ().

A. Pump body

B. transmission mechanism

C. oil quantity adjusting mechanism

D. sub-pump

30. The governor is when the load of the diesel engine changes, automatically change (), in order to maintain the pending operation of the engine.

A. fuel supply of fuel injection pump

B. Fuel supply for fuel pump

C. engine speed

D. throttle position

3 1. Needle valve and needle valve body are important parts of diesel fuel injector, collectively referred to as ().

A. needle valve coupler

B. sealed coupling

C. pressure-bearing coupling

D. sliding sleeve universal joint

32. Party A thinks that the oil supply of diesel pump can be adjusted automatically, but Party B thinks it can't. Do you think the above view () is correct?

Alcoholics Association

B.b

C.a and b

D. Others

33. The gasoline engine () will introduce high-voltage electricity into the combustion chamber, producing electric sparks and igniting the mixture.

A. High voltage line

B. Spark plugs

C. dealers

D. power supply

34. The gasoline engine distributor () consists of distributor head and distributor cover.

A. dealers

B. Circuit breaker

C. capacitor

D. ignition advance device

35. () spark plugs are widely used in high-speed engines.

A. standard type

B. protruding type

C. Fine electrode type

D. copper core wide calorific value type

36. No electric shock electronic ignition system uses the ignition signal sensor to replace the traditional ignition system ().

A. power-off contact

B. dealers

C. capacitor

D. ignition coil

37. Santana 2000 car engine ignition system for () electronic ignition system.

A. magnetic induction type

B. Hall style

C. photoelectric type

D. pulse type

38. () is the main reason why it is difficult to start a gasoline engine cold car.

A.the mixture is too thin

B.the mixture is too strong

C. Poor oil circuit

D. Ignition obstacle

39. () is the main reason why it is difficult to start a hot car.

A.the mixture is too thin

B.the mixture is too strong

C. Poor oil circuit

D. Ignition obstacle

40. The phenomenon that the diesel engine cannot be started is as follows: When starting with the starter (), the exhaust pipe does not smoke.

A. there was no sound of explosion.

B. Discontinuous crackling sound can be heard.

C. The engine is not running smoothly

D. the engine is weak.

4 1. Diesel engine is difficult to start: it can hear () sound when starting, and there is a small amount of smoke in the exhaust pipe.

A. Discontinuous outbreaks

B. Continuous sound bursts

C. Discontinuous cylinder knocking sound

D. continuously tap the cylinder.

42. The diesel engine running instability, this kind of fault is often accompanied by ().

A. white smoke produces knocking sound.

B. White smoke without knocking.

C. Detonation caused by black smoke

D. Smoke without knocking at the door

43. The diesel engine can't start should first find the reason from ().

A. gas source

B. Fuel delivery

C. Fuel atomization

D. Fuel injection time

44. The diesel engine is difficult to start, and the reasons should be found from (), fuel atomization and cylinder pressure and temperature at the end of compression.

A. Fuel injection time

B. Manual oil pump

C. Fuel delivery

D. fuel injection pump drive coupling

45. The diesel engine governor spring is too soft, which will lead to diesel engine ().

A. Maximum speed drop

B. Maximum speed rise

C. start-up difficulties

D. Idle speed reduction

46. When the diesel engine power is insufficient, () can be used in engine operation to observe the change of engine speed and find out the faulty cylinder.

A. Multi-cylinder oil cut-off method

B. Single cylinder oil cut-off method

C. Multi-cylinder fire extinguishing method

D. Single cylinder fire extinguishing method

True or false (please tick "√" for the following judgments, and "×" for the mistakes. )

() 1. The vent hole on the automobile transmission cover is blocked, which will cause oil leakage in the transmission.

() 2. The thinning or deterioration of gear oil of automobile transmission will cause transmission oil leakage.

() 3. The gap between the automobile brake friction plate and the brake drum is too small, which will lead to overheating of the brake drum.

() 4. Generally, the automobile transmission is prone to trip when the medium and high speed load changes suddenly or the automobile vibrates violently.

() 5. Loose wear, falling off or excessive wear of the ball head of the gear shift lever of the automobile transmission will cause the transmission to trip and stop.

() 6. The wear of the contact surface between the cone disk and the cone ring of the automobile transmission synchronizer will cause a large gap and affect the synchronization effect.

() 7. If the wheel hub bearing of the automobile is excessively worn, it will cause abnormal sound of the wheel hub bearing, and a new wheel hub bearing should be replaced.

() 8. The loose fit between the automobile shaft sleeve and the rear axle will lead to abnormal sound of the hub bearing.

() 9. The gap between the push rod and the piston of the automobile brake master cylinder is too small, which will lead to overheating of the brake drum.

() 10. The electronic control unit is an important part of the electronic control system of the electronically controlled engine.

() 1 1. Using electronic fuel injection system can improve the comprehensive performance of the engine.

() 12. The electronically controlled engine adopts oxygen sensor feedback control to further control the ignition time accurately.

() 13. The camshaft position sensor of electronically controlled engine inputs the camshaft speed signal to ECU, which is the main control signal for ignition and fuel injection.

() 14. The common phenomenon of unstable engine operation is smoke from the exhaust pipe.

() 15. The opening pressure of fuel injection can be reduced by increasing the pre-tightening degree of the injector pressure adjusting spring.

() 16. The difficulty in starting a heat engine gasoline engine is mainly caused by the rich mixture.

() 17. backfire of electronically controlled gasoline injection engine means that the exhaust muffler has a "shooting" sound when the car is driving and the power is insufficient.

() 18. When the electronically controlled engine fails, the battery must be disconnected from the circuit and tested with the decoder.

() 19. During the seal test of diesel fuel injector, a small amount of oil is allowed to drop from the fuel injector.

Chapter III Auto Repair

I. Multiple choice questions

1、C 2、D 3、C 4、B 5、B

6、A 7、C 8、D 9、D 10、A。

1 1、B 12、C 13、A 14、B 15、D

16、B 17、B 18、C 19、D 20、A

2 1、D 22、D 23、B 24、C 25、C

26、B 27、C 28、C 29、A 30、B

3 1、D 32、B 33、C 34、B 35、B

36、C 37、A 38、C 39、B 40、C