Download DBATU B.Tech 2019 March 3rd Semester Theory of Machines Question Paper

Download DBATU (Dr. Babasaheb Ambedkar Technological University) B Tech 2019 March (Bachelor of Technology) 3rd Semester Theory of Machines Question Paper

Course: B. Tech in Mechanical Engineering
Subject Name: Theory of Machine ? 1
Max Marks: 20 Date:-
?DR. BABASAHEB AMBEDKAR TECHNOLOGICAL UNIVERSITY, LONERE 3,?)
Mid Semester Examination ? March 2019 ?
Sem : III
Subject Code: BT-MEC 402
Duration:? 1 Hr.
Instructions to the Students:
1. F igures to the right indicates full marks
2. Assume suitable data, if and wherever necessary
\frv
Marks
Q. 1 Solve ' 6
i A kinematic chain is known as a mechanism when
(a) None of the link ?xed (b) One of the link is ?xed
(0) Two of the links are ?xed (d) None of these
ii ?Which of the following is an inversion of single slider crank chain?
(a) Watts indicator diagram (0) Beam engine
{c ) Elliptical Trammei (d) All of these
iii Lead?screw of a lathe with nut forms a ?
(a) Sliding pair (b) Rolling pair (0) Screw pair (d) Turning Pair
iv ? The locus of the instantaneous centre in space during a de?nite motion of the
body is called as ? ' ? j _
(a) Body centred (b) Space centred (c) Axode (d) None of these
v i If the links moves in opposite direction, rubbing velocity at pin is}
(3) (wi- (02) (b) (0)1 + (02) (d) (M (d) ?02 ?
vi Direction of linear velocity of any point on a link with respect to another point
on same link is
(a) Parallel to link joining 2 points (b) perpendicular to link joining 2 points
(0 ) At 45? to the link joining 2 points (d) None of these >
Q2 (3) De?ne Kinematic pair. Classify in detail 3*2
(b) State and Explain Kennedy?s Theorem
? Q. 3 Solve Any One of the following. 8
(a) The crank and connecting rod of a steam engine are 0.5 m and 2 m long respectively.
The crank makes 180 rpm in clockwise direction. When it has turned 45? from inner
dead Centre position, determine by relative velocity method, 1) velocity of piston,
2) angular velocity of connecting rod,3) velocity of point B on connecting rod 1.5m
from gudgeon pin, 4) velocities of rubbing at the pins of crankshaft, crank and
ctosshwd when the diameters of their pins are 50 mm,60 mm and 30 mm respectively.
(b) The mechanism of a wrapping machine , as shown in ?gure, has the dimensions are
01A = 100 mm ,AC =700 mm, BC =200 mm, 02C = 200 mm, 02E = 400 mm,
02D = 200 mm and BD = 150 mm. The crank 01A rotates at a uniform speed of 100
radls, Find the velocity of point B of the bell crank lever by instantaneous Centre
method
/ \
.1 9i \ *9
E? " x
\
\. I ?12? 21
200 mm A \ ? \g 2;
i 1 oz?tmlfc?:z?ir D a
300 mm 400 mm ?""'i
Figure 1