A A7017

b) Describe with diagram: (6)
i) Axial pitch 17) Lead iii) Lead angle for a worm gear
PART ^
Answer any four full questions, each carries 1Omarks.
9 a) What is the difference between simple and compound gear trains? (2) b) In an epicyclic

gear train, an arm carries two gears A and B having 36 and 45 (8)

teeth respectively. If the arm rotates at 150 rpm in the counter clockwise 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 makes 300rpm in the clockwise direction, what will

be the speed of gear B.
10 a) Explain with neat sketch working of differential gears. (7) b) How precision points are
obtained using Chebychev spacing? (3) 11 a) List the differences between type, number and
dimensional synthesis. (2) b) Perform 2 position graphic synthesis of slider crank mechanism for
any (8) convenient dimensions of crank and coupler.

12 a) Discuss overlay method. (4) b) Explain 3 position synthesis of four-link
mechanism. (6)
13 a) Design a four bar mechanism with the help of Frudenstein’s equation to (8) coordinate

the input and output angles as follows input angle =20°, 30°, and 45° output angles = 30°,
45° and 60°. Assume input link length = 1m
b) What is meant by function generator? (2)

14 Explain the procedure of analytical synthesis of mechanism of your choice with (10)
sketch.

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