stresses in the carcass are restricted and the tread area is stabilized by belts. This results in reduction of tread- scrubbling and thus appreciable increase in tyre life (2) the breaker belts hold the tread flatter against the road surface, thus causing increase of traction and safety, (3) the belts increase the resistance of the tyre against puncture.
Reference Books 1. Automotive Mechanics – Crouse/Anglin
2. Automobile Engineering by Dr Kirpal Singh
3. Automobile
Engineering by Pitman Viva Questions 1 Describe the requirements of an automobile wheel
2 What is alight alloy Discuss the merits and demerits of light alloy in automobile wheels
3 What are the
advantages of a disc wheel 4 What are inset, zero set and outset wheels
5 How is the vehicle weight supported in case of a wire wheel
6 What are the
advantages of a wire wheel 7 Why wire wheels cannot be used to mount a tubeless tyre
8 Name the different materials for automobile wheels
9 State the advantages of (i) Magnesium alloys (ii) Aluminum alloy wheels
10 What are the functions
of an automobile tyre 11 State various desirable properties of an automobile type
12 State various factors affecting tyre life
13 How does a tyre wear in case of (i) over-inflation (ii) under-inflation
14
How tyre is designated 15 What is type carcass
16 What is a function of a breaker belt
17 State the factors which road grip of a tyre depends
18 What is static unbalance
and dynamic unbalance 19 What is the reasons for higher braking efficiency on wet roads in case of radial ply tyres
20 What is ply rating of a tyre
21 Draw cross section of an automobile tyre and show on it various constructional features
22 How is tyre manufactured Explain briefly.
23 Compare the radial and
bias ply type carcass tyres 24 How does heat affect the tyre life
25 State reasons for the following tyre defects i) Ply separations ii) Uneven wear
(iii)Tread cracking
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