GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-V (OLD) EXAMINATION - WINTER 2018
--- Content provided by FirstRanker.com ---
Subject Code: 151905 Date: 07/12/2018
Subject Name: Machine Design - 1
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
--- Content provided by FirstRanker.com ---
Q.1 (a) What do you mean by standardization? Explain role of preferred numbers in standardization? 04
(b) What is Endurance Limit? Explain Design criteria with Solderberg’s line. 04
(c) Explain design of components for forging. 03
--- Content provided by FirstRanker.com ---
(d) Explain Manufacturing and assembly considerations in machine design 03
Q.2 (a) Define stress concentration factor. Explain methods for reducing stress concentration with figure. 07
(b) A rotating bar made of steel 45C8 (Su = 630 N/mm²) is subjected to a completely reversed bending stress. The corrected endurance limit of the bar is 315 N/mm². Calculate the fatigue strength of the bar for a life of 90,000 cycles. 07
OR
(b) What is the importance of wear considerations in design? Explain the measures to minimize the wear 07
--- Content provided by FirstRanker.com ---
Q.3 (a) Explain the following and state how can they be prevented? (i) Buckling of spring (ii) Surge in springs 07
(b) Explain the different types of stresses induced in a belt with neat sketch and State the different belt tension adjustment devices with neat sketch. 07
OR
Q.3 (a) (i) Give detailed classification of spring. List the materials for helical and leaf Spring 04
(ii) What is nipping in a leaf spring? Discuss its role. Derive equation for finding nipping in spring. 03
--- Content provided by FirstRanker.com ---
(b) Two parallel shafts connected by a crossed belt, are provided with pulleys 480 mm and 640 mm in diameters. The distance between the center line of the shaft is 3 m. Find by how much the length of the belt should be changed if it is desired to alter the direction of rotation of the driven shaft. 07
Q.4 (a) Sketch and explain various types of ends used for pressure vessels giving practical applications of each. 07
(b) (i) Discuss bearing seals & lubrication of rolling contact bearings. 04
(ii) Discuss causes of failure of antifriction bearing. 03
OR
--- Content provided by FirstRanker.com ---
Q.4 (a) A seamless cylinder with storage capacity of 0.025 m³ is made of plain carbon steel 30C8 (Su =500 MPa) and it is used for storing a liquid at 15 MPa pressure. The length of cylinder is twice its inner diameter. If the factor of safety is 2.5, determine the dimensions of the cylinder. 07
(b) Give the difference between (i) Sliding contact bearing and Rolling contact bearing. (ii) Hydrodynamic and Hydrostatic bearings 07
Q.5 (a) What factors affect the torque transmitting capacity of a friction clutch. What are the important consideration points in the design of a friction clutch? 07
(b) Discuss briefly the considerations for selection of friction lining material. What do you mean by a self-energizing brake and a self-locking brake? 07
OR
--- Content provided by FirstRanker.com ---
Q.5 (a) Why a positive clutch is used? Describe, with the help of neat sketches the working of jaw or claw clutch. 07
(b) Compare the simple band brake and differential band brake. Explain the importance of p-v product in break design 07
--- Content provided by FirstRanker.com ---
This download link is referred from the post: GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University