Name of the College : P.E.S College of Engineering
University : Visvesvaraya Technological University
Department : Automobile Engineering
Subject Code/Name : P08AU61/Automotive Chassis and Suspensions
Year : 2010-11
Degree : B.E
Sem : VI
Website : pescemandya.org
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/pescemandya.org/4672-qp.pdf
Automotive Chassis & Suspensions :
SIXTH SEMESTER B. E. – SEE – FOR THE ACADEMIC YEAR: 2010-11
Course with Code:-Automotive Chassis and Suspensions (P08AU61)
Time: 3 hrs
Related : P.E.S College of Engineering P08AU62 Automotive Transmission B.E Model Question Paper : www.pdfquestion.in/4675.html
Max.Marks:100
Note: Answer any five full questions choosing at least two questions from each part.
PART-A :
1. a. Explain with a neat sketch, layout of a front engine rear wheel drive. Also list its advantages and disadvantages. (10 Marks)
b. Two cars similar in all respects, except that one has rear wheels drive and the other front wheel drive, are used on a test track.
If the engine power does not limit the ability to climb grades, state which car can ascend the steeper grade, if the weight of each car is 14239N with 50% on each axle, the wheel base 2.666m, the CG above the ground is 0.5334m and the coefficient of friction of the track is 0.6, what is the difference between in grades which either car can ascend, if the engine power is not the limitation. (10 Marks)
2. a. What are the various loads acting on the chassis frame? What are the different cross sections used for the construction of chassis frame? Mention their relative merits. (10 Marks)
b. Explain the effects of various factors on the performance of a tyre. Also justify the importance of tyre rotation with respect to tyre performance. (10 Marks)
3. a. Derive expression for bearing loads on front axle. (06 Marks)
b. Sketch and explain starring linkage for vehicle with i) Rigid axle front suspension ii) independent front suspension. (08 Marks)
c. A motor car has a wheel base of 2.743 m and pint centre of 1.065m. The front and rear wheel track is 1.217m. Calculate the correct angle of outside lock and turning circle radius of the outer front and inner rear wheels when the angle of inside lock is 400. (06 Marks)
4. a. Derive an expression for velocity ratio in a Hooke’s joint. (06 Marks)
b. An automobile engine develops 28kW at 1500rpm and its bottom gear ratio is 3.06. If a propeller shaft of 4mm outside diameter is to be used, determine the inside diameter of mild steel to be used, assuming a safe shear stress of 55×103 Kpa for the mild steel. (06 Marks)
c. Sketch and briefly rear axle drives. (08 Marks)
PART-B :
5. a. Explain with a neat sketch the working of a pneumatic brake used in automobiles. What are its merits and demerits compared to hydraulic brakes? (11 Marks)
b. A motor car has a wheel base of 2.64m the height of its centre of gravity above the ground is 0.61m and it is 1.12m in front of the rear axle. If the car is traveling at 40km/hr on a level track, determine the maximum distance in which the car may be stopped, when
i) the rear wheels are braked
ii) the front wheels are braked
iii) all wheels are braked
The coefficient of friction between the tyre and the road may be taken as 0.6. (09 Marks)
6. a. What are the advantages of independent suspension over rigid axle suspension system? (04 Marks)
b. Explain construction on working of hydraulic shock absorber (06 Marks)
c. A typical coil suspension spring has 10 effective coil of a mean diameter 125mm and made out of wires of 15mm diameter. The spring id designed to carry, a maximum static load of 3531.6N. calculate shear stress and deflection under these load conditions.
If maximum shear stress of 637650KN/m2 is allowable in the material, what is the possible clearance in the spring? Take value of G=73575×103 kpa. (10 Marks)
7. a. Explain any two types of wheels used in automobiles. (06 Marks)
b. Write advantages of radial ply tyres over cross ply tyres. (04 Marks)
c. Explain different tests to be carried out on vehicle chassi s frame.(10 Marks)
8. Sketch and explain the following chassis components used in recent vehicles with advanced technologies.
i) Steering systems
ii) Brakes
iii) Suspension
iv) Wheels
(5×4=20 Marks)