Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 8th Sem New 2180206 Automobile System Design Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VIII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2180206 Date: 29/11/2018
Subject Name: Automobile system Design
Time: 02:30 PM TO 05:00 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) Define brake fade 03
(b) Explain function of suspension 04
(c) Explain design of propeller shaft for bending, torsion, rigidity and critical
speed criteria
07
Q.2 (a) What parameter required to design centrifugal clutch 03
(b) What is the requirement of Automotive clutch? 04
(c) A centrifugal clutch transmitting 15 kW at 900 rpm have 4 shoes which
engage from ? of running speed. Centre of gravity of the shoes are at 12
cm from the centre of the spider. Inside radius of the drum ring is 150 mm
and coefficient of friction for the shoes is 0.3. Find the torque transmitted
and the mass of a shoe
07
OR
(c) A single plate clutch, effective on both sides, is required to transmit 25 kW
at 3000 rpm. Determine the outer and inner radii of frictional surface, if the
co-efficient of friction is 0.255 the ratio of radii is 1.25 and the maximum
pressure is not to exceed 0.1 N/mm
2
. Also determine the axial thrust to be
provided by springs. Assume the theory of uniform wear.
07
Q.3 (a) What is function of steering knuckle 03
(b) Write design parameter for Final drive 04
(c) Explain design of fully floating, half floating axle and dead axle 07
OR
Q.3 (a) Explain properties of clutch fluid 03
(b) Define following terms in steering system.
1) Turning circle radius 2) Steering box torque
04
(c) Explain in detail Ackermann linkage theory for steering system 07
Q.4 (a) Compare Disc type brake with Drum type of brake 03
(b) Define following terms in braking system.
1) Brake balance 2) Braking efficiency
04
(c) A motor car has a wheel base of 2.64 m, the height of its C. G. above the
ground is 0.61 m and it is 1.12 m in front of the rear axle. If the car is
travelling at 40 kmlhr on a level track, determine the minimum distance in
which the car may be stopped, when
(a) the rear wheels are braked,
(b) the front wheels are braked,
(c) all wheels are braked.
The coefficient of friction between tyre and road may be taken as 0.6. Prove
any formula if assumed.
07
FirstRanker.com - FirstRanker's Choice
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VIII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2180206 Date: 29/11/2018
Subject Name: Automobile system Design
Time: 02:30 PM TO 05:00 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) Define brake fade 03
(b) Explain function of suspension 04
(c) Explain design of propeller shaft for bending, torsion, rigidity and critical
speed criteria
07
Q.2 (a) What parameter required to design centrifugal clutch 03
(b) What is the requirement of Automotive clutch? 04
(c) A centrifugal clutch transmitting 15 kW at 900 rpm have 4 shoes which
engage from ? of running speed. Centre of gravity of the shoes are at 12
cm from the centre of the spider. Inside radius of the drum ring is 150 mm
and coefficient of friction for the shoes is 0.3. Find the torque transmitted
and the mass of a shoe
07
OR
(c) A single plate clutch, effective on both sides, is required to transmit 25 kW
at 3000 rpm. Determine the outer and inner radii of frictional surface, if the
co-efficient of friction is 0.255 the ratio of radii is 1.25 and the maximum
pressure is not to exceed 0.1 N/mm
2
. Also determine the axial thrust to be
provided by springs. Assume the theory of uniform wear.
07
Q.3 (a) What is function of steering knuckle 03
(b) Write design parameter for Final drive 04
(c) Explain design of fully floating, half floating axle and dead axle 07
OR
Q.3 (a) Explain properties of clutch fluid 03
(b) Define following terms in steering system.
1) Turning circle radius 2) Steering box torque
04
(c) Explain in detail Ackermann linkage theory for steering system 07
Q.4 (a) Compare Disc type brake with Drum type of brake 03
(b) Define following terms in braking system.
1) Brake balance 2) Braking efficiency
04
(c) A motor car has a wheel base of 2.64 m, the height of its C. G. above the
ground is 0.61 m and it is 1.12 m in front of the rear axle. If the car is
travelling at 40 kmlhr on a level track, determine the minimum distance in
which the car may be stopped, when
(a) the rear wheels are braked,
(b) the front wheels are braked,
(c) all wheels are braked.
The coefficient of friction between tyre and road may be taken as 0.6. Prove
any formula if assumed.
07
2
OR
Q.4 (a) Write short note on tandem master cylinder. 03
(b) What is nipping in leaf spring? Write a note on air spring ? 04
(c) A cantilever leaf spring is designed to meet the following specifications:
Load on the spring = 2 kN
Total number of leaves = 8
Number of extra full-length leaves master = 2
Width of each leaf = 50 mm
Length of spring = 500 mm
Design stress in tension=350 MPa
What is the thickness of leaf required to meet above requirement.
07
Q.5 (a) What is tractive effort and gradeability 03
(b) Discuss general design considerations of suspension system 04
(c) Explain johnson?s method of optimum design with suitable example 07
OR
Q.5 (a) Different Forces act on suspension 03
(b) Write a Short note on single tube telescopic damper 04
(c) Explain design of hand brake with figure 07
*************
FirstRanker.com - FirstRanker's Choice
This post was last modified on 20 February 2020