Theory of Machines & Machine Design B.E Question Paper : jaduniv.edu.in
Name of the University : Jadavpur University
Department : Power Engineering
Degree : B.E
Subject Name : Theory Of Machines & Machine Design
Year/Sem : II/II
Website : jaduniv.edu.in
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/dspace.jdvu.ac.in/6157-Theory%20of%20machines%20&%20Machine%20Design.pdf
Jadavpur Theory Of Machines Question Paper
Bachelor Of Power Engg. Examination, 2010 :
(2nd Year, 2nd Semester)
Time : Three hours.
Full Marks : 100
Related : Jadavpur University High Pressure Utility Boiler B.E Question Paper : www.pdfquestion.in/6156.html
Answer question no. 1 and any two each from following two sections. :
Section 1
1. a) Write the steps to be followed by a designer in Machine Design. 4
b) Define Degrees of Freedom and explain Gruebler’s Equation 7
c) What are preferred numbers? 3
d) Define a gear train with sketch. Write the relation between velocity ratio and gear ratio. 6
Section 2
Answer any two questions :
2. a) Illustrate with sketches one higher pair and one lower pair. 6
b) What are the similarities and one difference between a machine and a mechanism. 2
c) Draw an inclined plane and mention the Mechanical
Section 3
Answer any two questions :
6. a) In a steam engine the steam pressure is 2 MPa and the cylinder diameter is 250 mm. The contact surfaces of the head and cylinder are ground and no packing is required. Choose a suitable bolt so that the joint is leak proof. Assume number of bolts to be used is 12. 10
b) A single square thread power screw is to raise a load of 50 KN. 10 A screw thread of major diameter of 34 mm and a pitch of 6 mm is used. The coefficient of friction at the thread and collar are 0.15 and 0.1 respectively. If the collar frictional diameter is 100mm and the screw turns at a speed of 1 revs -1 find
i) the power input to the screw.
ii) the combined efficiency of the screw and collar.
7. a) How are plain carbon steel designated?
b) What is the curvature effect in a helical spring? How does it vary with spring index? 5
c) What do you understand by shaft, axle and spindle? 3
d) Write the following sections of V-belts in descending order of strength – A, E,C 2
e) Two plates of 7mm thickness are connected by a double riveted lap joint of zigzag pattern. Calculate rivet diameter, rivet pitch and distance between rows of rivets for the joint. Assume ultimate tensile stress = 90MPa, ultimate shear = 60MPa and ultimate bearing stress = 120 MPa. 8
8. a) Derive the equation for Braking Torque in an internal expanding shoe brake. 12
b) What is the recommended center distance and belt speed for a flat belt drive? 3
c) Draw Welding Symbol with proper labels. 5
9. a) Two plates 200 mm wide and 10 mm thick are to be welded by means of transverse welds at the ends,. If the plates are subjected to a load of kN, find the size of the weld assuming the allowable tensile stress 70 MPa. 10
b) Why the slack side of the belt of a horizontal belt drive is preferable to place on the top side? 5
c) Label different terms of the bearing shown below. 5
Syllabus
PE/T/224 Theory Of Machines And Machine Design :
Planar mechanisms, four bar linkage, quick-return mechanism, velocity and acceleration analysis, kinematics of gears and gear trains, vibrations, balancing of rotating and reciprocating masses, gyroscopic motion, fly wheels, cam and cam follower design, inertia force analysis of reciprocating systems, design for variable and dynamic load, design of shaft, screws; bolted, riveted and welded joints, pulley, clutch and brake design, spur gear design, design of bearings, selection of bearings. Concept of limits, fits and tolerance.