PTU Punjab Technical University B-Tech May 2019 Question Papers 3rd Semester Robotics-ECE-EIE
Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(Automation & Robotics) (2011 & Onward) (Sem.?3)
KINEMATICS OF MACHINES
Subject Code : BTAR-305
M.Code : 63005
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1.
SECTION-A is COMPULSORY consisting of TEN questions carrying T WO marks
each.
2.
SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3.
SECTION-C contains T HREE questions carrying T EN marks each and students
have to attempt any T WO questions.
SECTION-A
1.
Answer briefly :
a. What is the difference between kinematic pair and kinematic chain?
b. Explain the terms: lower pair and higher pair.
c. Define the degree of freedom in case of mechanism.
d. What is the difference between normal and tangential acceleration?
e. Discuss the different types of instantaneous centres for a mechanism.
f. Define the terms: circular pitch and diametral pitch.
g. What do you mean by static and dynamic balancing?
h. What is the difference between simple and compound gear train?
i. Name the different types of dynamic forces in a mechanism.
j. What is spatial mechanism?
1 | M-63005
(S2)-1375
SECTION-B
2.
Sketch and explain the various inversions of a slider crank chain.
3.
Locate all the instantaneous centres for a four bar mechanism. The lengths of various
links are : AD = 125 mm; AB = 62.5 mm; BC = CD = 75 mm. If the link AB rotates at a
uniform speed of 10 r.p.m. in the clockwise direction, find the angular velocity of the
links BC and CD.
4.
Derive an expression for the magnitude and direction of coriolis component of
acceleration.
5.
In an epicyclic gear train, an arm carries two gears A and B having 36 and 45 teeth
respectively. If the arm rotates at 150 r.p.m. in the anticlockwise direction about the
centre of the gear A which is fixed, determine the speed of gear B. If the gear A instead
of being fixed and makes 300 r.p.m. in the clockwise direction, what will be the speed of
gear B?
6.
If the crank and the connecting rod are 300 mm and 1 m long respectively and the crank
rotates at a constant speed of 200 r.p.m., determine:
a. The crank angle at which the maximum velocity occurs
b. Maximum velocity of the piston.
SECTION-C
7.
Explain the following :
a. Mass moment of inertia; laws of motion.
b. Types of constrained motion.
c. Types of kinematic pair.
8.
Four masses A, B, C and D are attached to a shaft and revolve in the same plane. The
masses are 12 kg, 10 kg, 18 kg and 15 kg respectively and their radii of rotations are
40 mm, 50 mm, 60 mm and 30 mm. The angular position of the masses B, C and D are
60?, 135? and 270? from the mass A. Find the magnitude and position of the balancing
mass at a radius of 100 mm.
9.
A pinion having 30 teeth drives a gear having 80 teeth. The profile of the gears is
involute with 20? pressure angle, 12 mm module and 10 mm addendum. Find the length
of path of contact, arc of contact and the contact ratio.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
2 | M-63005
(S2)-1375
This post was last modified on 04 November 2019