Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 4th Sem New 2142504 Theory Of Machines Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2142504 Date:25/05/2019
Subject Name: Theory of Machines
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.
MARKS
Q.1 (a) Define following terms: (i) Completely constrained motion (ii)
Mechanism (iii) Inversion of a mechanism
03
(b) Draw pantograph mechanism with proportions of links shown and state
its applications.
04
(c) Enlist various straight line mechanisms and prove that Peaucellier
mechanism is a straight line mechanism.
07
Q.2 (a) Explain: Velocity of rubbing 03
(b) Discuss the procedure to draw velocity diagram for single slider crank
mechanism.
04
(c) Explain Ackerman steering gear mechanism with neat sketch,
advantages and drawbacks.
07
OR
(c) Derive an expression for the ratio of shafts velocities for hook's joint and
explain the polar diagram.
07
Q.3 (a) Explain following terms in context to kinematic synthesis: (1) Function
Generation (2) Structural Error (3) Precision points
03
(b) What is kinematic synthesis of mechanisms? Derive Freudenstein?s
equation.
04
(c) Describe a step by step procedure for the synthesis of slider crank
mechanism using 3 precision points.
07
OR
Q.3 (a) State different belt materials and their specific applications. 03
(b) Sketch and explain any one inversion of a double slider crank chain. 04
(c) The number of teeth on each of the two equal spur gears in mesh is
40.The teeth have 20? involutes profile and the module is 6 mm. If the
arc of contact is 1.75 times the circular pitch, find the addendum.
07
Q.4 (a) Enlist different types of gear train. Explain compound gear train with
neat sketch.
03
(b) Explain Klein's construction with an example. 04
(c) A single plate clutch, with both sides effective, has outer and inner
diameters 300 mm and 200 mm respectively. The maximum intensity of
pressure at any point in the contact surface is not to exceed 0.1 N/mm
2
.
If the coefficient of friction is 0.3, determine power transmitted by a
clutch at a speed 2500 r.p.m.
07
OR
Q.4 (a) Explain the terms in relation to gears:
(i) Addendum (ii) Backlash (iii) Pressure angle
03
(b) Write a short note on gear drives giving their merits and demerits. 04
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2142504 Date:25/05/2019
Subject Name: Theory of Machines
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.
MARKS
Q.1 (a) Define following terms: (i) Completely constrained motion (ii)
Mechanism (iii) Inversion of a mechanism
03
(b) Draw pantograph mechanism with proportions of links shown and state
its applications.
04
(c) Enlist various straight line mechanisms and prove that Peaucellier
mechanism is a straight line mechanism.
07
Q.2 (a) Explain: Velocity of rubbing 03
(b) Discuss the procedure to draw velocity diagram for single slider crank
mechanism.
04
(c) Explain Ackerman steering gear mechanism with neat sketch,
advantages and drawbacks.
07
OR
(c) Derive an expression for the ratio of shafts velocities for hook's joint and
explain the polar diagram.
07
Q.3 (a) Explain following terms in context to kinematic synthesis: (1) Function
Generation (2) Structural Error (3) Precision points
03
(b) What is kinematic synthesis of mechanisms? Derive Freudenstein?s
equation.
04
(c) Describe a step by step procedure for the synthesis of slider crank
mechanism using 3 precision points.
07
OR
Q.3 (a) State different belt materials and their specific applications. 03
(b) Sketch and explain any one inversion of a double slider crank chain. 04
(c) The number of teeth on each of the two equal spur gears in mesh is
40.The teeth have 20? involutes profile and the module is 6 mm. If the
arc of contact is 1.75 times the circular pitch, find the addendum.
07
Q.4 (a) Enlist different types of gear train. Explain compound gear train with
neat sketch.
03
(b) Explain Klein's construction with an example. 04
(c) A single plate clutch, with both sides effective, has outer and inner
diameters 300 mm and 200 mm respectively. The maximum intensity of
pressure at any point in the contact surface is not to exceed 0.1 N/mm
2
.
If the coefficient of friction is 0.3, determine power transmitted by a
clutch at a speed 2500 r.p.m.
07
OR
Q.4 (a) Explain the terms in relation to gears:
(i) Addendum (ii) Backlash (iii) Pressure angle
03
(b) Write a short note on gear drives giving their merits and demerits. 04
2
(c) Name the different types of clutches. Describe with the help of neat
sketches the working principles of two different types of friction
clutches.
07
Q.5 (a) Explain the ?fast and loose pulley? with the help of a neat sketch. 03
(b) Discuss the term interference in relation to gear. 04
(c) A cam with a minimum radius of 25 mm is to be designed for a flat face
reciprocating follower. Information available is as follows: (a) Rise of
the follower through 20 mm during 120? of cam rotation, (b) Dwell for
next 30? of the cam rotation (c) Descending of the follower during the
next 120? of cam rotation (d) Dwell during rest of the cam rotation. Draw
the profile of the dam if the ascending and descending of the cam is with
simple harmonic motion.
07
OR
Q.5 (a) Define the following terms in relation with cams and followers:
(i) Conjugate cam (ii) Pressure angle (iii) Dwell
03
(b) Enlist 4 different types of follower motions stating a typical application
of each.
04
(c) A differential band brake, as shown in Fig.1, has a drum diameter of 600
mm and the angle of contact is 240?. The brake band is 5 mm thick and
100 mm wide. The coefficient of friction between the band and the drum
is 0.3. If the band is subjected to a stress of 50 MPa, find : 1. The least
force required at the end of a 600 mm lever, and 2. The torque applied
to the brake drum shaft.
Figure-1
07
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This post was last modified on 20 February 2020