Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 8th Sem New 2180206 Automobile System Design Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VIII(NEW) EXAMINATION ? SUMMER 2019
Subject Code:2180206 Date:17/05/2019
Subject Name:Automobile system Design
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Give your comments and justify on the given statement. ?Braking action
when traveling in ?reverse? is not as effective as when travelling
?forward?.?
03
(b) Explain the uniform wear theory while designing the single plate clutch. 04
(c) A centrifugal clutch transmitting 20kW at 750 rpm consist of four shoes.
The clutch is to be engaged at 500 rpm the inner radius of the drum is
165mm the radius of the center of gravity of the shoes is 140mm, when
the clutch is engaged. The coefficient of friction is 0.3 , while the
permissible pressure on friction lining is 0.1 N/mm
2
calculate
a) The mass of each shoe; and
b) The dimensions of friction lining.
07
Q.2 (a) Justify a given statement ?It is more logical and safer to use uniform
wear theory in the design of clutch?.
03
(b) Explain the advantages and disadvantages of disk brake in automotive
vehicle.
04
(c) Define the spring length terminology with the design parameters with
the sketch diagram.
07
OR
(c) The following data is given for a caliper disk brake with annular pad for
the front wheels of sports car.
Torque capacity = 1500 Nm
Outer radius of pad = 150 mm
Inner radius of pad = 100 mm
Coefficient of friction = 0.35
Average pressure on pad = 2 N/mm
2
Number of pads = 2
Determine the angular dimension of the pad.
07
Q.3 (a) How does weight transfer occurs during braking? 03
(b) What is the significance of spring index in spring design? 04
(c) A truck spring has 12 numbers of leaves, two of which are full length
leaves the spring supports are 1.05 m apart and the central band is 85mm
wide. The central load is to be 5.4kN with a permissible stress of
280MPa. Determine the thickness and width of the steel spring leaves.
The ratio of the total depth to the width of the spring is 3. Also determine
the deflection of the spring
07
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VIII(NEW) EXAMINATION ? SUMMER 2019
Subject Code:2180206 Date:17/05/2019
Subject Name:Automobile system Design
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Give your comments and justify on the given statement. ?Braking action
when traveling in ?reverse? is not as effective as when travelling
?forward?.?
03
(b) Explain the uniform wear theory while designing the single plate clutch. 04
(c) A centrifugal clutch transmitting 20kW at 750 rpm consist of four shoes.
The clutch is to be engaged at 500 rpm the inner radius of the drum is
165mm the radius of the center of gravity of the shoes is 140mm, when
the clutch is engaged. The coefficient of friction is 0.3 , while the
permissible pressure on friction lining is 0.1 N/mm
2
calculate
a) The mass of each shoe; and
b) The dimensions of friction lining.
07
Q.2 (a) Justify a given statement ?It is more logical and safer to use uniform
wear theory in the design of clutch?.
03
(b) Explain the advantages and disadvantages of disk brake in automotive
vehicle.
04
(c) Define the spring length terminology with the design parameters with
the sketch diagram.
07
OR
(c) The following data is given for a caliper disk brake with annular pad for
the front wheels of sports car.
Torque capacity = 1500 Nm
Outer radius of pad = 150 mm
Inner radius of pad = 100 mm
Coefficient of friction = 0.35
Average pressure on pad = 2 N/mm
2
Number of pads = 2
Determine the angular dimension of the pad.
07
Q.3 (a) How does weight transfer occurs during braking? 03
(b) What is the significance of spring index in spring design? 04
(c) A truck spring has 12 numbers of leaves, two of which are full length
leaves the spring supports are 1.05 m apart and the central band is 85mm
wide. The central load is to be 5.4kN with a permissible stress of
280MPa. Determine the thickness and width of the steel spring leaves.
The ratio of the total depth to the width of the spring is 3. Also determine
the deflection of the spring
07
2
OR
Q.3 (a) Inscribe the term bake fade. 03
(b) Explain the telescopic type suspension system. 04
(c) Design a spring for a balance to measure 0 to 1000 N over a scale length
80mm. the spring is to be enclosed in a casing of 25mm diameter. The
approximate number of turns is 30. G= 85kN/mm
2
.also calculate the
maximum shear stress induced. Diameter of wire should be considered
between 3 to 6 mm. ?? =
4 ?? ? 1
4 ?? ? 4
+
0 . 615
?? . Assuming necessary data if
require.
07
Q.4 (a) Discuss the design consideration for a friction clutch. 03
(b) Write a short note on semi floating axle hub. 04
(c) Write a short note on following terms
1) Air resistance 2) Rolling resistance
07
OR
Q.4 (a) Write a short note on stopping distance. 03
(b) Give explanation any one type of gear box used in steering system. 04
(c) A propeller shaft is required to transmit 45kW power at 500 rpm. It is a
hollow shaft having an inside diameter 0.6 times of the outside diameter.
It is made of plain carbon steel and the permissible shear stress is 84
N/mm
2
.calculate the inside and outside diameter of the propeller shaft.
07
Q.5 (a) Explain the steering gear ratio for steering system design. 03
(b) Give explanation the cross section design for vehicle axle. 04
(c) Explain Johnson?s method of optimum design. 07
OR
Q.5 (a) Explain a brief note on leaf spring with suitable sketch. 03
(b) With the sketch diagram of internal expanding brake and indicate the all
require parameters.
04
(c) Explain the Ackermann-linkage geometry for the steering system
design.
07
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This post was last modified on 20 February 2020