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Dynamics of Machinery (October 2009)

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Total No. of Questions : 12] P968 [Total No. of Pages : 4 [3664]-123 B.E. (Mechanical) DYNAMICS OF MACHINERY (2003 Course) (402042) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) Answer 3 questions from Section I and 3 questions from Section II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. Q1) a) b) Q2) a) b) Q3) a) b) c) SECTION - I Unit - I Define the following terms related to gyroscope with neat sketch: (i) Axis of spin, (ii) Axis of couple, (iii) Axis of precession, (iv) Active and Reactive gyro. couple. [8] A disc of mass 5 kg and of radius of gyration of 90mm is mounted centrally on a horizontal shaft of 120mm length between the bearings. The disc is spinning about the axis of the shaft at 620 rpm anticlockwise, when viewed from the right-hand side bearing. The shaft precesses about a vertical axis at 35rpm in the clockwise direction when observed from the top. Determine the resultant reaction at each bearing due to the mass and the gyroscopic effect. [8] OR Explain the terms - steering, pitching and rolling in a ship. Discuss their gyroscopic effects. [8] A pair of flanged wheels 1.2m in diameter are mounted on axle rolls along rails spaced at 1.3m apart. The axle negotiates a curve of 150 m mean radius at a speed of 60 km/hr. Determine the reactions at the rails. The wheels are thin discs of 270 kg mass each. The rails are at the same level. Neglect the mass of the axle. [8] Unit - II What do you understand by (i) static unbalance and (ii) Dynamic unbalance. [4] With the help of a neat sketch, explain in brief the working of static and Dynamic balancing machines. [4] A shaft rotates in two bearings A and B, 1.8m apart and projects 0.45m P.T.O.

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Additional Info : 2003 Course
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