Test of a generic vehicle maintenance technical manual
Length of examination: 120 minutes full: 100 minutes
Test of a generic vehicle maintenance technical manual
I. Single-choice topics (10 total, 2 points each, 20 points)
1. Which of the following components must be used during the calibration of motors
A. The twister
B. Timelights
C. Refrigerated liquid detectors
D. Pressure table
2. In the event of a malfunction in the abs system, which sign do you normally display on the dashboard
Turning lights
B. Handbrake indicators
C. Abs warning lights
D. Oil pressure indicators
3. Which of the following steps is wrong when changing brakes
A. Tightening the brakes to the bolts
B. Use of specialized tools to press the piston
C. Cleaning of brake plates
D. Leaching of brake blades
4. Which of the following can be excluded from the possible reasons for the poor refrigeration of car air conditioning
A. Refrigerant deficiency
Compressor failure
C. Condensers
D. Too hot for engines
5. Which of the following tools is the preferred tool in conducting a vehicle electrical system test
A. Wrench
B. The universal scale
C. Wrench
D. The kettle
6. How many kilometres is the normal fuel replacement cycle for motorized tanks
A. 5000
B. 10000
C20,000
D. 30000
7. Car tires need to be replaced when they have depths below millimetres
A. 1 mm
B. 2 mm
C. 3mm
D. 4 mm
8. Which of the following factors are not included in the probable cause of an acoustic motor
A. Pistol wear
B. Fragmentation of the temporal belt
C. Air filter congestion
D. Broken bearings
9. What is the normal voltage value for car bottles
A. 12
B. 13. 5
C. 14. 5
D. 15
10. Which of the following steps was wrong when the car airbag system was tested
A. Inspection of airbag control unit connections
B. Use of diagnostics to read fault codes
C. Simulation of airbags for testing
D. Replacement of all sensors
Ii. Filling in blanks (10 total, 2 points each, 20 points total)
An early-fired corner of a car engine means the corner between and 。
The primary function of abs is to prevent cars from being braked。
When replacing brake plates, grinding shall be performed using 。
Models commonly used for car ac refrigerants are 。
When inspecting a car electrical system, electro-voltage is measured using 。
The fuel of the transformer tank shall be replaced by the oil of the model 。
Car tyres usually have a tire pressure of kpa。
Reasons for the possible noise of engines include , and 。
The electrolyte density of car cylinders is usually g/cm3。
When testing the airbag system, a failure code is required for reading。
Iii. Judicial questions (10 total, 2 points per issue, 20 points in total)
1. The motor must be shut down when it is calibrated. (x)
2. The failure of the abs system results in long brake distances. (grunts)
3. Replacement of brake plates does not require the cleaning of the braking surface. (x)
4. Excessive car air-conditioning refrigerants lead to poor refrigeration performance. (grunts)
5. When inspecting a vehicle's electrical system, the current can be measured using a universal meter. (x)
6. The fuel replacement cycle for transformer tanks has nothing to do with driving habits. (x)
7. Car tires need to be replaced if they have a depth below 2 mm. (grunts)
8. Reasons for the possible sounding of the engine include the wear and tear of the piston ring, the fracture of the time belt and damage to the bearing of the pole. (grunts)
9. Vehicle cylinders need to be recharged when their volts are below 12 volts. (grunts)
10. General diagnostic instruments can be used for testing the airbag system. (x)
Iv. Brief answers (total of 3 4 points each, total 12 points)
1. Briefly describe the steps taken to calibrate the vehicle's engine on time。
2. List possible reasons for the poor cooling of car air conditioners。
3. Briefly describe the steps taken to test the car airbag system。
V. Application questions (total of 2 9 points each, total 18 points)
1. Please indicate the steps taken to replace the brake blades and take care of them。
2. For a vehicle, the cooling effect of air conditioning is poor, please list possible reasons and detection methods。
[standard answers and resolution at the end of the paper]
I. Questionual answers and resolution
1. B (timelights are tools that must be used to perform engine calibration on time to ensure synchronization of gas doors and pistons
2. C (abs warning light is the instruction light on the dashboard used to indicate the failure of the abs system
3. D (no lubricant required for brake blade installation, otherwise the effect of the brake would be affected
4. D (high water temperature of engines leads to poor air conditioning cooling but is not a direct cause
5. B (multiple scale is the preferred tool for the detection of automobile electrical systems, which can measure voltage, current and resistance
6. B (vehicle gear tank oil replacement cycle usually 10,000 km)
7. B (vehicle tyres need to be replaced if they have a depth below 2 mm
8. C (air filter jamming does not cause engine noise
9. B (the normal voltage of car cylinders is 13. 5 volts)
10. C (secrecyte system tests cannot be simulated to carry out tests, otherwise system damage may occur
Ii. Answers to empty questions and their resolution
1. Cam axis, piston (the early corner of the ignition means the corner between the cam axis and the piston to ensure the exact timing of the ignition)
The main function of the abs system is to prevent vehicles from sliding when brakes are made
3. Special sand turbines (when the brakes are replaced, they must be grinded by a special sand turbine to ensure that the surface is flat
R134a (r134a is commonly used for car air-conditioning refrigerants
Mass-use tables (one-size-use meters are required to measure voltage when inspecting a car electrical system
6. Vector tank oil (the transformer tank oil shall be replaced with the transformer tank oil type
7. 300 (car tyres usually have a tire pressure of 300 kpa
Pistol wears, puncture belts are broken, and coil bearings are damaged (the possible cause of the acoustic noise of the engine includes piston wear, puncture belts and coil bearing damage)
9. 1. 25 (the electrolytic density of car cylinders is usually 1. 25 g/cm3
10. Diagnosis (safe airbag system tests require failure code reading using a diagnostic device
Iii. Question answer and resolution
1. X (the motor must be turned on to ensure the accuracy of the timing
2. √ (abs system failure will lead to longer brake distances, as the wheel slips when brakes are made)
3. X (the brakes shall be replaced by a clean-up of the brake surface to ensure their effect
4. √ (too many car ac refrigerants can lead to poor refrigeration, as too many refrigerants can lead to excessive system pressure
5. X (in inspecting a vehicle's electrical system, voltage can only be measured using a mass gauge and current cannot be measured
6. X (the fuel replacement cycle for transformer tanks is related to driving habits and frequent short-distance travel requires more frequent replacement
7. √ (vehicle tyres need to be replaced at depths below 2 mm, otherwise the brake effects will be affected
8. Zirconium (the possible cause of the sounding of the engine is the wear of the piston ring, the fracture of the time belt and damage to the bearing of the pole
9. Zirconium (a car bottle needs to be recharged when its voltage is below 12 volts, otherwise it will cause damage to the bottle
10. X (secrecyte system tests require the use of a specialized diagnostic device, which does not have the capability to read the failure code
Iv. Brief answers and resolution
1. Steps for timing of motor calibration:
(1) turn off the engine and break the negative pole of the bottle。
(2) use a time light to point to a curve axis and a cam axis。
(3) adjustment of the ignition early angle as required by the maintenance manual。
(4) reconnect the negative poles of the vials and start the engine check for accuracy。
2. Possible causes of poor air conditioning:
(1) refrigerant is insufficient。
(2) compressor failure。
(3) condensers jam。
(4) an expansion valve failure。
3. Steps to be taken to test the car airbag system:
(1) checks whether the airbag control unit connections are loose or damaged。
(2) use a diagnostic device to read the failure code。
(3) check whether the balloon sensor is normal。
(4) checks the normal conduct of airbag tests。
V. Application of the questions and deliberation
1. Steps and attention to the replacement of brakes:
Steps:
(1) dismantling of wheels, display of brake cards and brake plates。
(2) pressure the piston with special tools to remove the old brake plates。
(3) clean up the brake surface and ensure that it is flat。
(4) installation of new brakes to ensure their installation。
(5) stuck the brakes to the bolts and install the wheels。
Note:
(1) when replacing brake blades, special tools shall be used to avoid damage to brake card clamps。
(2) when brakes are installed, no lubricant is required, otherwise the effect of the brakes will be affected。
(3) after replacing brake blades, brake tests must be performed to ensure that brakes work properly。
2. Method of detection of low-refrigeration effects of car air conditioning:
(1) check whether refrigerants are inadequate and use pressure sheets to measure refrigerant pressure。
(2) checks whether the compressor is working and uses a diagnostic device to read the failure code。
(3) check if the condenser is plugged and clean the condenser's surface。
(4) checks whether the swelling valve is malfunctioning and uses a diagnostic device to detect the working state of the swelling valve。
(5) checks whether air conditioning fans are working and ensures that the condenser is heat-dispersed。
