Class 11 Automotive Service Technician Chapter 8 Servicing of Wheels Solutions English Medium As Per AHSEC New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters Class 11 Automotive Service Technician Chapter 8 Servicing of Wheels Question Answer and select need one. Class 11 Automotive Service Technician Chapter 8 Servicing of Wheels Notes Download PDF. AHSEC Class 11 Automotive Service Technician Question Answer English Medium.
Class 11 Automotive Service Technician Chapter 8 Servicing of Wheels
Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. Class 11 Automotive Service Technician Chapter 8 Servicing of Wheels Textual Solutions are part of All Subject Solutions. Here we have given AHSEC Class 11 Automotive Service Technician Textbook Solutions English Medium for All Chapters, You can practice these here.
Servicing of Wheels
Chapter: 8
| SESSION 1: IMPORTANCE OF WHEELS |
| Check Your Progress |
A. Fill in the blanks:
1. Wheels are used in _____________.
Ans: Transport.
2. Wheels are fitted in front and ____________ of an engine.
Ans: Rear.
3. Alloy wheels are used in ___________.
Ans: Cars.
4. Disc wheels are used in ___________.
Ans: Heavy vehicles.
B. Answer the following questions:
1. What are the differences between disc wheels and alloy wheels?
Ans: The differences between disc wheels and alloy wheels are as under:
| Disc Wheels | Alloy Wheels |
| These types of wheels consist of two parts: a steel rim and a pressed steel disc. | These types of wheels are made of aluminium alloy. |
| The steel disc is welded to the rim. | Aluminium alloy is a better conductor of heat. |
| Prone to rust, more durable in harsh conditions. | Less prone to rust, may be more prone to damage. |
| Poor heat dissipation. | Better heat dissipation. |
2. Why is it important to service tyres of a vehicle?
Ans: Car tyres have an important bearing on the performance and safety of the car. Ensuring that the tyres are in good condition is important. Old and worn out tyres can easily lead to skidding of the vehicle.
| SESSION 2: IMPORTANCE OF HUB GREASING AND PLAY ADJUSTMENT |
| Check Your Progress |
A. Fill in the blanks:
1. Stud is used to hold_____________.
Ans: Wheel hub.
2. To remove the stud ________ is used.
Ans: Stud remover tool.
3. _____________ is used in the bearing.
Ans: Grease.
4. Replace the _________when it is broken.
Ans: Brake drum.
B. Answer the following questions:
1. What is hub greasing?
Ans: For friction-free rotation of wheels, it is necessary to lubricate the wheel hub and wheel bearing at specified intervals. Bearing grease is used to lubricate these items.
2. Differentiate between wheel hub and wheel axle?
Ans: The differences between wheel hub and wheel axle are as under:
| Wheel hub | Wheel axle |
| Wheel hub is a single casted unit mounted on stub axle shaft or on the casing. | The front main axle is connected to the stub axle. |
| It consists of two taper roller bearings in which spacer is placed between two bearings. | The stub axle holds the wheel hub. |
| Center of the wheel. | Connects the wheel hub to the vehicle’s suspension or frame. |
| Enables smooth wheel rotation. | Bears the weight of the vehicle and withstands stress. |
| Rotates with the wheel. | Can either rotate with the wheel (driven axle shaft) or be stationary (support axle for non-driven wheels). |
| SESSION 3: TYRE AND TUBE MAINTENANCE |
| Check Your Progress |
A. Fill in the blanks:
1. For normal wear of tyre uniformly, it is recommend that all wheels should be shifted _____________ after every 10000 kms run of vehicle.
Ans: Crosswise.
2. The tyre is ____________on the wheel rim.
Ans: Mounted.
3. Nose pliers is used to _______ small objects.
Ans: Remove.
4. __________ is used for loosening parts.
Ans: Wrench.
B. Answer the following questions:
1. Explain the importance of air pressure in tyres.
Ans: Air pressure in tyres should always be maintained at specified pressure given by the manufacturer. Proper air pressure gives cushioning effect and stability to the wheel. Air pressure should be checked with the help of a pressure gauge.
2. What are the advantages of rotation of wheels?
Ans: The advantages of rotation of wheels are as under:
(i) It helps to reduce tyre wear.
(ii) It ensures even wear on all tyres.
(iii) It improves vehicle handling and control.
(iv) It increases tyre life.
(v) It improves fuel efficiency.
(vi) It ensures better safety and comfort while driving.
(vii) It is recommended that all four wheels should be shifted crosswise after every 10,000 km run of the vehicle or as per specification.
3. Differentiate between tyres and tubes.
Ans: The differences between tyres and tubes are as under:
| Tyres | Tubes |
| Tyres may be of two types: Tube tyres and Tubeless tyres. | Tubes are used inside tube-type tyres. |
| The outer portion of tyre rolls on the road surface and is made of synthetic rubber. | Tube is a separate inflatable part fitted inside the tyre. |
| Generally heavier than a tube due to its robust construction. | Relatively lighter than the tyre casing. |
| Outer covering that contacts the road. | Inner component that maintains air pressure. |
4. Give the advantages of tubeless tyres.
Ans: Advantages of Tubeless Tyre:
(i) The tubeless tyres are lighter and run cooler than tubed tyre.
(ii) The main advantage is that it retains air for a long period even after being punctured by nail, provided the nail remains in the tyre. But the tube tyre releases the air almost immediately after being punctured.
(iii) Any hole in the tubeless tyre can be repaired simply by rubber plugging.
(iv) Ordinary punctures can be repaired with removing the tyre from the wheel.
(v) It can be retreated in the same manner as the tube tyre.
| SESSION 4: REPAIRING OF PINCTURED TUBE |
| Check Your Progress |
A. Fill in the blanks:
1. ____________is used for cleaning the tyre.
Ans: Brush.
2. The puncture can be located by __________ and immersing the tyre with ____________ in a water tank.
Ans: Inflating tyre, wheel rim.
3. _____________ is used in hot patch process.
Ans: Vulcaniser.
4. For removing nail from tyre __________ is used.
Ans: Nose piler.
B. Answer the following questions:
1. Explain the process of puncture repairing.
Ans: The process of puncture repairing are as under:
(i) Dry off the punctured tube.
(ii) Rub the punctured portion using fine grade emery paper or rasp or rubber file.
(iii) Apply cold patch adhesive solvent on and around the puncture area and leave it for a few minutes to dry.
(iv) Remove the cover from cold patch and place it centrally on the punctured portion of the tube in mini press unit and press the cold patch.
(v) After repairing, fill air in the tube and check for leakage.
(vi) Before refitting, apply white powder (French chalk powder) inside the tyre.
(vii) Fit the tyre bed on the wheel rim properly or use tyre removing machine.
(viii) Fix the wheel back on the hub, tighten the nut diagonally to specified torque, fill recommended air pressure and remove the jack.
2. Give the difference between hot and cold process of puncture repairing.
Ans: The differences between hot and cold process of puncture repairing are as under:
| Cold Patch Method | Hot Patch Method |
| (i) Dry off the punctured tube. | (i) Carried out with the help of small vulcanising machine. |
| (ii) Rub the punctured portion using fine grade emery paper or rasp or rubber file. | (ii) Clean the punctured part using emery paper or rasp file. |
| (iii) Apply cold patch adhesive solvent on and around the puncture area and leave it for few minutes to dry. | (iii) Apply adhesive solvent (black in colour) on the puncture area. |
| (iv) Remove the cover from cold patch and place it centrally on the punctured portion of the tube in mini press unit and press the cold patch. | (iv) Cut a piece of rubber and place it centrally over the puncture, then press it. |
| (v) After repairing, fill air in the tube and check for leakage. | (v) Place the punctured portion downward on the heater plate and tighten the vulcaniser hand wheel so the pressure plate presses the tube. |
3. How is tubeless puncture repairing done?
Ans: One of the advantages of tubeless tyre is that while repairing the puncture, the tyre need not be detached from the wheel rim.
Instruments and materials required:
(i) Bodkin.
(ii) Wire brush.
(iii) Cold patch adhesive solvent.
(iv) Rubber plugs of different diameter.
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