Subject Code:2180206
GUJARAT TECHNOLOGICAL UNIVERSITY
--- Content provided by FirstRanker.com ---
BE- SEMESTER-VIII (NEW) EXAMINATION — WINTER 2020
Subject Name:Automobile system Design
Time:02:00 PM TO 04:00 PM
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
--- Content provided by FirstRanker.com ---
Q.1 (a) Why is a cone clutch more effective than a plate clutch? 03
(b) Explain the design procedure of a centrifugal clutch. 04
(c) A single plate clutch both sides effective is to transmit 30 KW at 200 rpm. The pressure is being applied axially by means of springs, and is limited to 0.15 N/mm². If the outer diameter of the plate is 250 mm, find the required inner diameter of the plate and axial force necessary to engage the clutch. Assume the theory of uniform wear and p = 0.3. 07
--- Content provided by FirstRanker.com ---
Q.2 (a) Explain the principle of a braking system. 03
(b) Explain and derive the fundamental equation for correct steering. 04
(c) A track has pivot pins 1.37 m apart, the length of each track arm is 0.18 m and the track rod is behind the front axle and 1.27 m long. Determine the wheel base which will give true rolling for all wheels when the car is turning so that the inner wheel stub axle is 60° to the centre line of the car. A geometrical construction may be used. 07
Q.3 (a) Explain stopping distance. 03
(b) Give the function of a steering system and draw a layout of steering linkage. 04
--- Content provided by FirstRanker.com ---
(c) Give advantages and disadvantages of a hydraulic system. 07
Q.4 (a) Explain bleeding of hydraulic brakes. 03
(b) State types of steering gear box and explain one of them with a neat sketch. 04
(c) Compare Disc type brake and Drum type brake. 07
Q.5 (a) What should be the characteristics of a propeller shaft? 03
--- Content provided by FirstRanker.com ---
(b) Explain twin tube telescopic damper with a neat sketch. 04
(c) Explain with a neat diagram the construction of a fully floating rear axle. 07
Q.6 (a) Explain various components and their functions in a hydraulic braking system. 03
(b) Explain working of Disc brake with a neat sketch. 04
(c) Design a suitable I-section for the front axle assuming the following data: 07
--- Content provided by FirstRanker.com ---
Total weight of car = 1400 Kg
Load taken by front axle = 650 Kg
Wheel track = 140 cm
Distance between the center of spring pads = 70 cm
Flange width and thickness are 0.6 and 0.2 of the overall depth of the section.
--- Content provided by FirstRanker.com ---
Working stress = 900 Kg/cm²
Thickness of the web = 0.25 width of flange.
Date:28/01/2021
Total Marks: 56
--- Content provided by FirstRanker.com ---
Q.7 (a) Explain wheel alignment. 03
(b) Give a detailed classification of universal joints and explain any one of them with a neat sketch. 04
(c) Design a cylindrical helical spring of circular cross-section wire to carry safely an axial compressive load of 6000 N at a maximum stress of 800 MN /m². The spring stiffness should be 25 KN/m. Take spring index 7 and ratio of length to mean diameter of coil = 1.7 to 2.3 07
Determine
1) Mean diameter of coil
--- Content provided by FirstRanker.com ---
2) Diameter of wire
3) Total deflection
Q.8 (a) Explain torsion bar. 03
(b) Explain the design procedure of a propeller shaft. 04
(c) Explain Johnson’s method of optimum design with a suitable example. 07
--- Content provided by FirstRanker.com ---
This download link is referred from the post: GTU B.Tech 2020 Winter Question Papers || Gujarat Technological University
--- Content provided by FirstRanker.com ---