Name of the College : P.E.S College of Engineering
University : Visvesvaraya Technological University
Department : Automobile Engineering
Subject Code/Name : P08AU62/AUTOMOTIVE TRANSMISSION
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/4675-qp.pdf
Automotive Transmission Question Paper :
SIXTH SEMESTER B. E. – SEE – FOR THE ACADEMIC YEAR: 2010-11
Credits: 04
Time: 3 hrs Max.
Related : P.E.S College of Engineering P08AU61 Automotive Chassis & Suspensions B.E Model Question Paper : www.pdfquestion.in/4672.html
Marks: 100
Note: 1. Answer any five full questions choosing at least two questions from each part
2. Figures/ layouts are to be drawn using pencil only
PART- A :
1) a)Explain the traction, tractive effort and various resistances to the motion of a vehicle with the help of graphs (08Marks)
b) A vehicle of total weight 49050 N is held at rest on a slope of 10º. it has a wheel base of 2.25 M and its centre of gravity is 1.0 M in front of the rear axle and 1.5 M above the ground level. Find
a) What are the normal reactions at the wheels ?
b) Assuming that sliding does not occur first, what will be the angle of slope so that the vehicle will overturn ?
c) Assuming all wheels are to be braked, what will be the angle of the slope so that the vehicle will begin to slide if the coefficient of adhesion between the tyre and ground is 0.35 ? (12 Marks)
2) a) Discuss the various factors affecting torque transmission in a clutch (4 Marks)
b) With sketch explain the construction and working of a single plate clutch ( 8 Marks )
c) Derive an expression for effective mean radius and torque transmitted in case of a cone clutch ( 8Marks )
3) a) Determine the size of the clutch plate suitable for a vehicle employing a single plate type of friction clutch and developing 37.5 KW at 4200 rpm.
The inside diameter of the clutch plate is 0.6 times its outside diameter and it is to be ensured that even after a loss of 30 % of the engine torque due to wear of the clutch facing , the clutch does not slip . The intensity of pressure on the facing is not to exceed 70 KN/m2 . Assume µ=0.3 ( 8 Marks )
b) With simple sketch and graph explain the principle of fluid flywheel and its characteristics at different speeds. (8 Marks)
c) With sketch explain the working principle of sprag type one way clutches ( 8 Marks )
4) a) Sketch and explain the single stage torque converter. How does it differ from a fluid flywheel ? (10Marks)
b) With sketch explain any one of the method used to increase the higher efficiency range of a torque converter (10Marks)
PART _ B :
5) a) Explain the construction and working of a constant mesh gear box. Highlight the advantages and disadvantages over the sliding mesh gear box (10 Marks )
b) A four speed gear box is to be constructed for providing the ratios of 1.0, 1.46, 2.28 and 3.93 to 1 as nearly as possible. The diametral pitch of each gear is 3.25 mm and the smallest pinion is to have at least 15 teeth.
Determine the suitable number of teeth of the different gears. What is then the distance between the main and lay shaft ? ( 10 Marks )
6) a) Sketch and explain the principle of epicyclic gearing. Mention its advantages. ( 10 Marks)
b) Sketch and explain the working of a Wilson planetary gearbox ( 10Marks )
7) a) What is automatic transmission ? Explain with the aid of layout the Borg-war ners automatic transmission. (10Marks )
b) With layout explain the electric transmission system and its limitations. (10 Marks )
8.) Write short notes on any four of the following.
a) Advanced transmission used in recent vehicle
b) Double declutching
c) Transfer box
d) Over drives
e) Phase and stage in torque converter
Sixth Semester B. E. – See – For The Academic Year : 2010-11
1. A curved beam with a circular central line has trapezoidal cross section and it is subjected to pure bending in its plane of symmetry. The face 100mm is the concave side of the beam and is 100mm from the centre of curvature and thee load line.
If the depth of the trapezoid is 100mm, find the proper value of the other parallel face to the concave side to make extreme fibre stress in tension and compression numerically equal.
2. a) A flat circular plate is used to close the flanged end of a pressure vessel of internal diameter of 300 mm. The vessel carries a fluid at a pressure of 2.5 N/mm2 .
A soft copper asbestos gasket is used to make the joint leak proof. Eight bolts are used to fasten cover plate on to the pressure vessel. Selecting carbon steel C30 as material for the bolt, determine the size of the bolts.