Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 3rd Sem New 2131906 Kinematics Of Machines Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?III (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2131906 Date: 18/06/2019
Subject Name:Kinematics 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) Explain the terms:
1. Machine 2. Structure 3.Mechanism
03
(b) Sketch and explain inversions of four bar chain mechanism(any two) 04
(c) What are the types of inversions? Explain crank and slotted lever type quick
return mechanism.
07
Q.2 (a) Classify straight line generating mechanisms. 03
(b) State and prove ?Aronhold Kennedy?s Theorem? of three instantaneous
centres.
04
(c) Explain the Freudenstein?s method of three-point synthesis of mechanisms. 07
OR
(c) Explain chebyshev spacing method for location precision point position in
four bar chain mechanism.
07
Q.3 (a) Define linear and angular velocity. 03
(b) Write a short note on velocity and acceleration diagram. 04
(c) PQRS is a four bar chain mechanism. The length of the links are PQ =
62.5mm; QR = 175mm; RS = 112.5mm; and PS = 200 mm. the link PS is
a fixed link. The crank PQ rotates at 10 rad/s clockwise and makes
0
60
with i.d.c. Draw the velocity and acceleration diagram. Q and R lie on the
same side of PS. Find the angular velocity and angular acceleration of links
QR and RS.
07
OR
Q.3 (a) Explain function generation 03
(b) Define Type synthesis and Number synthesis. 04
(c) Synthesize a four bar mechanism to meet the following instantaneous
conditions for input output links:
0
60 ? ? ?= 90
0
rad/sec 3
2
? ? rad/sec 2
4
? ?
2
2
rad/sec 1 - ? ? 0
4
? ?
07
Q.4 (a) What is speed ratio and velocity ration in gear trains. 03
(b) Write a complete classification of gear trains. 04
(c) Explain the working of Epicyclic gear train with sketch. Also give its
applications. what are the advantages of Epicyclic gear train?
07
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?III (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2131906 Date: 18/06/2019
Subject Name:Kinematics 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) Explain the terms:
1. Machine 2. Structure 3.Mechanism
03
(b) Sketch and explain inversions of four bar chain mechanism(any two) 04
(c) What are the types of inversions? Explain crank and slotted lever type quick
return mechanism.
07
Q.2 (a) Classify straight line generating mechanisms. 03
(b) State and prove ?Aronhold Kennedy?s Theorem? of three instantaneous
centres.
04
(c) Explain the Freudenstein?s method of three-point synthesis of mechanisms. 07
OR
(c) Explain chebyshev spacing method for location precision point position in
four bar chain mechanism.
07
Q.3 (a) Define linear and angular velocity. 03
(b) Write a short note on velocity and acceleration diagram. 04
(c) PQRS is a four bar chain mechanism. The length of the links are PQ =
62.5mm; QR = 175mm; RS = 112.5mm; and PS = 200 mm. the link PS is
a fixed link. The crank PQ rotates at 10 rad/s clockwise and makes
0
60
with i.d.c. Draw the velocity and acceleration diagram. Q and R lie on the
same side of PS. Find the angular velocity and angular acceleration of links
QR and RS.
07
OR
Q.3 (a) Explain function generation 03
(b) Define Type synthesis and Number synthesis. 04
(c) Synthesize a four bar mechanism to meet the following instantaneous
conditions for input output links:
0
60 ? ? ?= 90
0
rad/sec 3
2
? ? rad/sec 2
4
? ?
2
2
rad/sec 1 - ? ? 0
4
? ?
07
Q.4 (a) What is speed ratio and velocity ration in gear trains. 03
(b) Write a complete classification of gear trains. 04
(c) Explain the working of Epicyclic gear train with sketch. Also give its
applications. what are the advantages of Epicyclic gear train?
07
2
OR
Q.4 (a) What are the standard tooth profiles? 03
(b) What is interference and undercutting in gear? 04
(c) Two involute gears of pressure angle are rotating in mesh. The speed of
smallest gear is 1400 rpm. The number of teeth on pinion is 20 and gear
ratio is 2. If the addendum of pinion and wheel is standard and equal to
one module and module is 5mm.Consider pressure angle as 20.
Find:
(i) length of arc of contact.
(ii) velocity of sliding at the point of contact.
07
Q.5 (a) What is cam and follower? 03
(b) Roller follower is more preferable to that of knife edged follower .why? 04
(c) Define the following terms as applied to cam with neat figure. (i) Base
circle (ii) Pitch circle, (iii) Pressure angle, (iv) stroke of the follower. (v)
Prime circle.
07
OR
Q.5 (a) What are the types of motion of the follower? 03
(b) With the help of neat sketches explain the types of cams and followers 04
(c) Draw a cam profile for a given data:
1. Outstroke during
0
60 of cam rotation
2. Dwell for the next
0
45 of cam rotation
3. Return stroke during next
0
60 of cam rotation and
4. Dwell for the remaining of cam rotation
The stroke of follower is 50mm and the minimum radius of the cam is
40mm. The follower moves with uniform velocity during both the
outstroke and return strokes. The follower is of knife edge type. Draw the
profile of the cam when the axis of the follower is passes through the axis
of cam shaft.
07
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This post was last modified on 20 February 2020