What Causes the Backfiring Sound When Throttling Down a Motorcycle?

How long will points be deducted for gear and speed mismatch in Subject 3?

In the Subject 3 driving test, a mismatch between vehicle speed and gear will result in a 10-point deduction. Additional information: 1. Gear shifting in Subject 3 test: Each gear has a specific speed range. For example, use 2nd gear between 10-30 km/h, 3rd gear between 20-40 km/h, and 4th gear between 30-50 km/h, subject to local testing site requirements. 2. Perform sequential gear shifting - skipping gears during road tests is strictly prohibited: When accelerating to 20 km/h, you can shift from 1st to 2nd gear, but not directly from 1st to 3rd gear. If you select the wrong gear, don't panic - immediately depress the clutch, return to neutral, and shift again. Gear changes should be decisive and smooth, with proper coordination between throttle and clutch during acceleration and upshifting. 3. If you hear a point deduction announcement, stay calm and immediately identify your current speed and gear: (1) Take immediate action. If the speed is lower than the gear requires, don't accelerate immediately. (2) The safest approach is to depress the clutch, shift to a lower gear, and then perform matching operations. If the speed is higher than the gear requires, simply decelerate.

8

0

Share

Why is the wiper sound loud?

There are three main reasons for loud wiper sounds: 1. Normal break-in noise from new wipers - they still clean effectively and the sound isn't sharp. The blade structure differs between beam-style and conventional wipers. About 90% of beam-style wipers use horizontal multi-layer rubber strips for wiping. When the first layer has already cleared all rainwater, the subsequent layers may scrape against dry glass, creating noise. 2. Incorrect blade alignment - may cause incomplete cleaning during one stroke with sharp noise. This usually indicates an installation angle deviation in the wiper arm, creating an improper contact angle between the rubber and windshield. 3. Blade edge issues - caused by aging or defective products, producing sharp noise with vibration and poor cleaning in both directions. After prolonged use, about 30% of oxidized wiper rubbers develop similar problems.

19

3

Share

How Much Horsepower Does a 1.8L Engine Have?

1.8L displacement family sedans typically have a power output ranging from 120 to 170 horsepower. The engine displacement and horsepower data are primarily determined by key factors such as the car manufacturer, engine structure, engine performance, exhaust system, and vehicle positioning. Generally, the larger the displacement, the higher the upper limit of the engine's horsepower. Below is an introduction to the relationship between displacement and horsepower: 1. Overview: Displacement refers to the volume of the engine cylinders, while horsepower refers to the engine's power. Displacement does not equal horsepower. Under normal circumstances, displacement and horsepower are proportional—the larger the displacement, the greater the power and horsepower. 2. Horsepower is determined by many factors: Horsepower is influenced by numerous factors, with displacement only determining the upper limit of the engine's horsepower. Factors such as cylinder bore, valve technology, and tuning also affect the engine's power output.

9

5

Share

How much does 8.8l/100km fuel consumption cost?

8.8L/100km, calculated at 7 yuan per liter, amounts to 0.616 yuan per kilometer in fuel costs. Here is additional information: 1. Constant-speed fuel consumption: Constant-speed fuel consumption refers to the fuel consumption per 100 kilometers obtained by certain types of vehicles during constant-speed fuel consumption tests as stipulated by national standards. 2. Vehicles subject to constant-speed fuel consumption tests include: (1) M1 category vehicles, M2 category vehicles with a maximum design total mass not exceeding 3.5 tons, and N1 category compressed natural gas vehicles; M1 category and N1 category vehicles with a maximum design total mass not exceeding 3.5 tons, tested according to the method specified in GB/T12545.1-2008 "Test methods for fuel consumption of passenger cars." (2) M2 and M3 category compressed natural gas vehicles with a maximum design total mass exceeding 3.5 tons, and N2 and N3 category vehicles; M2, M3 category vehicles and N category vehicles with a maximum total mass greater than or equal to 2 tons, tested according to the method specified in GB/T12545.2-2001 "Test methods for fuel consumption of commercial vehicles."

10

4

Share

What is the internal structure of a sedan?

The interior of a sedan generally consists of four basic parts: the engine, chassis, body, and electrical equipment. Below is an introduction to the related components: 1. Car Engine: The engine is the power unit of the car, composed of 2 major mechanisms and 5 major systems, namely the crankshaft-connecting rod mechanism, valve mechanism, cooling system, fuel supply system, lubrication system, ignition system, and starting system. However, diesel engines have one less ignition system compared to gasoline engines. 2. Car Chassis: The chassis serves to support and install the car engine and its various components, forming the overall shape of the car. It receives power from the engine to enable movement and ensure normal operation. The chassis consists of four parts: the transmission system, running system, steering system, and braking system. 3. Car Body: The body is mounted on the frame of the chassis and is used for the driver, passengers, or cargo. The bodies of cars and buses are generally of an integrated structure, while truck bodies usually consist of two parts: the cab and the cargo compartment. 4. Electrical Equipment: The electrical equipment is composed of two main parts: the power source and the electrical devices. The power source includes the battery and generator; the electrical devices include the engine's starting system, the ignition system of gasoline engines, and other electrical equipment.

20

1

Share

Is the Theory Course for Subject 1 Mandatory?

It depends on local regulations. Subject 1 is a theoretical knowledge test and is very important. According to regulations, it is mandatory to attend training courses organized by the traffic police department. These courses are taught by professionals from the traffic police department, which helps in gaining a solid grasp of the knowledge. This way, when encountering situations while driving in the future, you will know how to handle them. If you have any questions, you can also ask during the course, which is beneficial for passing the exam more effectively. More learning methods are introduced as follows: 1. Training courses: Attending training courses at driving schools can also provide some help in passing the exam. 2. At home: Self-study at home is also a good method. If you lack confidence, you can practice more questions at home. 3. General summary: In general, if the regulations require attending training courses organized by the traffic police department, you should study seriously. If there are no such regulations locally, it is still better to attend training courses at driving schools. Although self-study at home can also help you pass the exam, the knowledge may not be deeply ingrained, and you might feel at a loss when encountering situations while driving in the future.

8

2

Share

What Causes the Backfiring Sound When Throttling Down a Motorcycle?

How long will points be deducted for gear and speed mismatch in Subject 3?

Why is the wiper sound loud?

How Much Horsepower Does a 1.8L Engine Have?

How much does 8.8l/100km fuel consumption cost?

What is the internal structure of a sedan?

Is the Theory Course for Subject 1 Mandatory?

Should a 10-Year-Old Car Use 30 or 40 Oil?

How to Observe Traffic Lights When Making a U-Turn?

How many kilometers can a car run after changing tires?

Is driving at 50 in a 40 km/h speed limit zone considered speeding?