DBATU B-Tech Last 10 Years 2010-2020 Previous Question Papers || Dr. Babasaheb Ambedkar Technological University
DR. BABASAHEB AMBEDKAR TECHNOLOGICAL UNIVERSITY, LONERE
Mid Semester Examination - March 2019
Course: B. Tech in Mechanical Engineering Sem: III
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Subject Name: Theory of Machine -1 Subject Code: BT-MEC-402
Max. Marks: 20 Date:- Duration:- 1 Hr.
Instructions to the Students:
- Figures to the right indicates full marks
- Assume suitable data, if and wherever necessary
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| Q.1 | Solve | 6 |
| i A kinematic chain is known as a mechanism when (a) None of the link fixed (b) One of the link is Fixed (c) Two of the links are Fixed (d) None of these | ||
| ii Which of the following is an inversion of single slider crank chain? (a) Watt indicator diagram (b) Beam engine (c) Elliptical Trammel (d) All of these. | ||
| iii Lead screw of a lathe with nut forms a --- Content provided by FirstRanker.com --- (a) Sliding pair (b) Rolling pair (c) Screw pair (d) Turning Pair | ||
| iv The locus of the instantaneous centre in space during a definite motion of the body is called as (a) Body centred (b) Space centred (c) Axode (d) None of these | ||
| v If the links moves in opposite direction, rubbing velocity at pin is (a) (w1- w2) (b) (w1+ w2) (c) (w1) w2 (d) r.w | ||
| vi Direction of linear velocity of any point on a link with respect to another point on same link is --- Content provided by FirstRanker.com --- (a) Parallel to link joining 2 points. (b) perpendicular to link joining 2 points.(c) At 45° to the link joining 2 points (d) None of these | ||
| Q.2 | (a) Define Kinematic pair. Classify in detail | 3+2 |
| (b) State and Explain Kennedy's Theorem | ||
| Q.3 | Solve Any One of the following: | |
| (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 1.5m on connecting rod. --- Content provided by FirstRanker.com --- from gudgeon pin. 4.) velocities of rubbing at the pins of crankshaft, crank andcrosshead when the diameters of their pins are 50 mm, 60 mm and 50 mm respectively. | ||
| (b) The mechanism of a wrapping machine, as shown in figure, has the dimensions are O1A = 100 mm, AC =700 mm, BC = 200 mm, O2C = 400 mm, O2E = 400 mm, O1D = 200 mm and BD = 150 mm. The crank O1A makes at a uniform speed of 100 rad/s. Find the velocity of point E of the bell crank lever by instantaneous Centre --- Content provided by FirstRanker.com --- method. | ||
Figure 1
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