Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 4th Sem New 2142001 Kinematics And Dynamics Of Machines Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2142001 Date:17/05/2019
Subject Name: Kinematics & 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) State and explain types of constrained motion with figure. 03
(b) Derive an equation for gayo-couple with usual notation 04
(c) What is Coriolis acceleration component? In which cases does it occur?
How is it determined?
07
Q.2 (a) Define instantaneous center and instantaneous axis. 03
(b) Enlist the types of inversion for (i) four bar kinematic chain (ii) single slider
kinematic chain and (iii) double slides kinematic chain.
04
(c) Fig.1 Shows the toggle mechanism in which the crank OA rotates at a
uniform speed of 105 rpm in clock wise direction. Determine the velocity
and acceleration of slider P. The lengths of various links are: OA=8 cm,
AB=18 cm, BC=24cm and BP=28 cm.
07
OR
(c) Describe Klein?s construction with an example 07
Q.3 (a) Derive an equation for length of path of contact for gear train 03
(b) Explain the effects of Gyroscopic couple on an Aero plane with sketch. 04
(c) Explain with a neat sketch the ?Sun and Planet wheel?. Write its merits
and demerits as compared to reverted and compound gear trains.
07
OR
Q.3 (a) What are the different types of motion with which a follower can move? 03
(b) Derive the condition for correct steering. Sketch and show the Davis
steering mechanism and discuss their advantages.
04
(c) A Flat faced mushroom follower is operated by a cam of minimum radius
50 mm and gives a lift of 30 mm. The rise takes place in 120? of cam rotation
with SHM followed by a dwell for the next 30? of cam rotation. It returns
with equal uniform acceleration and retardation during 90? of cam rotation.
The line of action of the follower passes through the axis of the cam. Draw
a cam profile and determine the maximum velocity and acceleration of the
follower during the outward and return strokes, if the cam rotates at 240
rpm. What should be the minimum width of the follower?
07
Q.4 (a) Explain the phenomena of ?slip? and ?creep? in a belt drive. 03
(b) Derive the condition for transmitting the maximum power in a flat belt drive. 04
(c) Explain the method of balancing of different masses revolving in same
plane
07
OR
Q.4 (a) What do you mean by balancing? Why it is necessary for high speed
engines?
03
(b) Explain primary unbalanced force in reciprocating engine. Why
reciprocating masses are partially balanced?
04
(c) What is the smallest number of teeth theoretically required in order to avoid
interference on a pinion having pressure angle 22? and module 1 Which is
to gear with
1) Rack
07
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2142001 Date:17/05/2019
Subject Name: Kinematics & 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) State and explain types of constrained motion with figure. 03
(b) Derive an equation for gayo-couple with usual notation 04
(c) What is Coriolis acceleration component? In which cases does it occur?
How is it determined?
07
Q.2 (a) Define instantaneous center and instantaneous axis. 03
(b) Enlist the types of inversion for (i) four bar kinematic chain (ii) single slider
kinematic chain and (iii) double slides kinematic chain.
04
(c) Fig.1 Shows the toggle mechanism in which the crank OA rotates at a
uniform speed of 105 rpm in clock wise direction. Determine the velocity
and acceleration of slider P. The lengths of various links are: OA=8 cm,
AB=18 cm, BC=24cm and BP=28 cm.
07
OR
(c) Describe Klein?s construction with an example 07
Q.3 (a) Derive an equation for length of path of contact for gear train 03
(b) Explain the effects of Gyroscopic couple on an Aero plane with sketch. 04
(c) Explain with a neat sketch the ?Sun and Planet wheel?. Write its merits
and demerits as compared to reverted and compound gear trains.
07
OR
Q.3 (a) What are the different types of motion with which a follower can move? 03
(b) Derive the condition for correct steering. Sketch and show the Davis
steering mechanism and discuss their advantages.
04
(c) A Flat faced mushroom follower is operated by a cam of minimum radius
50 mm and gives a lift of 30 mm. The rise takes place in 120? of cam rotation
with SHM followed by a dwell for the next 30? of cam rotation. It returns
with equal uniform acceleration and retardation during 90? of cam rotation.
The line of action of the follower passes through the axis of the cam. Draw
a cam profile and determine the maximum velocity and acceleration of the
follower during the outward and return strokes, if the cam rotates at 240
rpm. What should be the minimum width of the follower?
07
Q.4 (a) Explain the phenomena of ?slip? and ?creep? in a belt drive. 03
(b) Derive the condition for transmitting the maximum power in a flat belt drive. 04
(c) Explain the method of balancing of different masses revolving in same
plane
07
OR
Q.4 (a) What do you mean by balancing? Why it is necessary for high speed
engines?
03
(b) Explain primary unbalanced force in reciprocating engine. Why
reciprocating masses are partially balanced?
04
(c) What is the smallest number of teeth theoretically required in order to avoid
interference on a pinion having pressure angle 22? and module 1 Which is
to gear with
1) Rack
07
2
2) An Equal pinion
3) A wheel to give a ratio of 3:1.
Q.5 (a) What is a damped vibration? What are the different types of damping
methods?
03
(b) Distinguish between longitudinal, transverse and torsional vibration. 04
(c) A flat belt runs on a pulley 1 m in diameter and transmits 8kW at 200 rpm.
Assuming angle of lap as 170? and coefficient of friction as 0.25. Find the
necessary width of belt if the pull is not exceed 200 N/cm width of the belt.
Neglect centrifugal tension.
07
OR
Q.5 (a) What is meant by vibration isolation and transmissibility?
03
(b) Explain following term.
(1) Time period (2) Frequency (3) Amplitude and (4) Damping.
04
(c) What do you understand by degree of freedom? What are the various causes
of vibrations? How the effects of undesirable vibrations can be reduced?
07
*************
Q.2 (c) Fig. 1
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This post was last modified on 20 February 2020