Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 4th Sem Old 142001 Kinematics And Dynamics Of Machines Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV (OLD) EXAMINATION ? WINTER 2018
Subject Code:142001 Date: 05/12/2018
Subject Name: Kinematics And Dynamics 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.
Q.1 (a) Define Grashof?s law. How is it helpful in classifying the four-link mechanisms into
different types?
07
(b) Explain different types of gear trains with suitable sketches. 07
Q.2 (a) Distinguish Completely constrained, Incompletely constrained and Successfully
constrained motion with neat sketch.
07
(b) Differentiate the following with suitable example & neat sketches. (I) Lower &
Higher Pairs (II) Closed & unclosed pairs (III) Machine & Structure
07
OR
(b) Describe with a neat sketch the principle and working of pantograph. 07
Q.3 (a) Explain different types of flat belt drives with neat sketches. 07
(b) Find the power transmitted by a belt running over a pulley of 600 mm diameter at
200 r.p.m. The Coefficient of friction between the belt and the pulley is 0.25. angle
of lap 160
o
and maximum in the belt is 2500 N.
07
OR
Q.3 (a) How do the effect of gyroscopic couple and centrifugal force make the rider of a two
wheeler to tilt on one side? Derive a relation for the limiting speed of vehicle.
07
(b) Define Vibrations. Explain Types of vibratory motion. 07
Q.4 (a) Define the following gear terminologies with suitable sketch.
(i) Pitch circle (ii) Module (iii) Addendum (iv) Pressure angle
07
(b) A pair of 20
0
involute gears has module of 5 mm the pinion has 20 teeth and gear
has 60 teeth. Addenda of pinion and gear wheel in terms of module are one. Find the
following:
(i) Number of pair in contact.
(ii) Angle turned through by the pinion and gear wheel for one pair in
contact.
07
OR
Q.4 (a) State and prove the Law of gearing with neat sketch. 07
(b) In the epicyclic gear train shown in Fig 1, an arm carries two wheels (gears) A and
B having 24 and 48 teeth respectively. If the arm C rotates at 200 r.p.m. in the
clockwise direction about the axis of gear A and the wheel A is fixed, Find the speed
of gear B. If the wheel A rotates 300 r.p.m. in clockwise direction instead of being
fixed, What will be the speed of gear B?
( Fig 1)
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV (OLD) EXAMINATION ? WINTER 2018
Subject Code:142001 Date: 05/12/2018
Subject Name: Kinematics And Dynamics 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.
Q.1 (a) Define Grashof?s law. How is it helpful in classifying the four-link mechanisms into
different types?
07
(b) Explain different types of gear trains with suitable sketches. 07
Q.2 (a) Distinguish Completely constrained, Incompletely constrained and Successfully
constrained motion with neat sketch.
07
(b) Differentiate the following with suitable example & neat sketches. (I) Lower &
Higher Pairs (II) Closed & unclosed pairs (III) Machine & Structure
07
OR
(b) Describe with a neat sketch the principle and working of pantograph. 07
Q.3 (a) Explain different types of flat belt drives with neat sketches. 07
(b) Find the power transmitted by a belt running over a pulley of 600 mm diameter at
200 r.p.m. The Coefficient of friction between the belt and the pulley is 0.25. angle
of lap 160
o
and maximum in the belt is 2500 N.
07
OR
Q.3 (a) How do the effect of gyroscopic couple and centrifugal force make the rider of a two
wheeler to tilt on one side? Derive a relation for the limiting speed of vehicle.
07
(b) Define Vibrations. Explain Types of vibratory motion. 07
Q.4 (a) Define the following gear terminologies with suitable sketch.
(i) Pitch circle (ii) Module (iii) Addendum (iv) Pressure angle
07
(b) A pair of 20
0
involute gears has module of 5 mm the pinion has 20 teeth and gear
has 60 teeth. Addenda of pinion and gear wheel in terms of module are one. Find the
following:
(i) Number of pair in contact.
(ii) Angle turned through by the pinion and gear wheel for one pair in
contact.
07
OR
Q.4 (a) State and prove the Law of gearing with neat sketch. 07
(b) In the epicyclic gear train shown in Fig 1, an arm carries two wheels (gears) A and
B having 24 and 48 teeth respectively. If the arm C rotates at 200 r.p.m. in the
clockwise direction about the axis of gear A and the wheel A is fixed, Find the speed
of gear B. If the wheel A rotates 300 r.p.m. in clockwise direction instead of being
fixed, What will be the speed of gear B?
( Fig 1)
07
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2
Q.5 (a) Classify cam and explain any two with neat sketch. 04
(b) A cam is to give the following motion to a knife-edged follower :
(i) Outside during 60
0
of cam rotation.
(ii) Dwell for the next 30
0
of cam rotation.
(iii) Return stroke during next 60
0
of cam rotation and
(iv) Dwell for the remaining 210
0
of cam rotation.
The stroke of the follower is 40 mm and the minimum radius of the cam is 50 mm.
The follower moves with uniform velocity during both outstroke and return stokes.
Draw the profile of the cam when the axis of the follower passes through the axis of
the cam shaft.
10
OR
Q.5 (a) Explain why only a part of the unbalanced force due to reciprocating masses is
balanced by revolving mass.
07
(b) What are quick return motion mechanisms? Where they are used? Discuss the
functioning of any one of them.
07
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This post was last modified on 20 February 2020