Download GTU BE/B.Tech 2019 Winter 4th Sem Old 141902 Kinematics Of Machines Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 4th Sem Old 141902 Kinematics Of Machines Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? IV (Old) EXAMINATION ? WINTER 2019
Subject Code: 141902 Date: 14/12/2019

Subject Name: Kinematics Of Machines

Time: 10:30 AM TO 01:00 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)
Sketch double slider cranks chain & draw its inversion
07
(b)
Define: Kinematic link, Kinematic chain, Mechanism, Degrees of freedom, Lower pair,
Higher pair, Inversion
07

Q.2 (a)
Explain modified Scott Russell mechanism with the help of neat sketch
07
(b)
Enlist different types of steering gear mechanism of automobile. Explain any one in detail
with neat sketch
07
OR
(b)
Explain Klein?s construction method in detail with neat sketch
07

Q.3 (a) Classify synthesis problems 07
(b)
Explain briefly dimensional synthesis
07
OR
Q.3 (a)
Two 20
0
involute spur gear mesh externally and give a velocity ratio of 3. The module is 3
mm and the addendum is equal to 1.1 modular. If the pinion rotates at 120 rpm, Determine:
(1) Minimum number of teeth on each wheel to avoid interference (2) Contact ratio.
07
(b)
State and prove the law of gearing.
07

Q.4 (a)
Discuss relative merits and demerits of belt, rope and chain drive for transmission of power.
07
(b)
What are different types of chains? Explain with neat sketches of power transmission
chains.
07

OR
Q.4 (a)
Explain the Phenomenon of ?slip?& ?creep? in a belt drive.
07
(b)
A casting weighing 9 kN hangs freely from a rope which makes 2.5 turns round a drum of
300 mm diameter revolving at 20 rpm. The other end of the rope is pulled by a man. The
coefficient of friction is 0.25. Determine: (1) The force required by a man (2) The power to
raise the casting.
07

Q.5 (a)
Explain instantaneous centre method for finding out velocity of a point on link. 0
07
(b)
In a four bar chain ABCD, AD is fixed link. Crank AB rotates in clock wise direction at an
angular velocity of 10 rad/sec. Link AB=60 mm, BC=CD=70 mm, DA=120 mm. When angle
DAB=600 and the points B and D are on one side of the link AD, Find angular velocity of
link BC and link CD.
07
OR

Q.5 (a)
Classify followers & explain with neat sketch
07
(b)
A cam is to be designed for a knife edge follower with the following data:
1. Cam lift=40 mm during 90
0
of cam rotation with SHM.
2. Dwell for the next 30
0
.
3. During the next 60
0
of cam rotation, the follower returns to its original position with SHM.
4. Dwell during the remaining 180
0
.
Draw the cam profile when the line of stroke is passing from the axis of the cam shaft. The
radius of the base circle of the cam is 40 mm. Determine the maximum velocity and
acceleration of the follower during its ascent and descent, if the cam rotates at 240 rpm.
07

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