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

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

Mid Semester Examination -? March 2019
Course: B. Tech in Mechanical Engineering ' Sem : 111
Subject Name: Theory of Machine - 1
DR. BABASAHEB AMBEDKAR TECHNOLOGICAL UNIVERSITY, LONERE B?
- Subject Code: BT-MEC 402
Max Marks: 20 Date:- Duration:- 1 Hr.
? Instructions to the Students:
1. Figures to the right indicates full marks
2. Assume suitable data, if and wherever necessary
Marks
Q. l ? 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
(c) 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
(:2 ) Elliptical Trammel (d) All of these
iii Lead?screw of a lathe with nut forms a
(a) Sliding pair (b) Rolling pair (c) 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 " V j
(a) Body centrod (b) Space centred (c) Axode (d) None of these
v If the links moves in opposite direction, rubbing velocity at pin is
(a) ?(wl- <02) (b) (0)1 + 032) (d) (M (d) r1602 '
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
(e ) At 45? to the link joining 2 points (d) None of these
0.2 (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 E on connecting rod 1.5m
from gudgeon pin, 4) velocities of rubbing at the pins of crankshaft, crank and
crosslnmd 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 OIA rotates at a uniform speed of 100
rad/s. Find the vetocity of point B of the bell crank lever by instantaneous Centre
method
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Figure 1
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