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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER-II EXAMINATION WINTER 2018
Subject Code:X21902 Date: 07/01/2019
Subject Name: Kinematics of Machines
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt Any five questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1

List different types of straight line motion mechanisms and explain any one with neat sketch.
07

Explain Davis steering gear mechanism with neat sketch.
07
Q.2

Explain the types of rope drives and discuss the advantages and limitation of rope drives over other drive.
07

What is the Coriolis acceleration? Derive an expression for the magnitude and direction of coriolis component of acceleration.
07
Q.3

Derive the expression for length of belt for cross belt drive.
07

Derive the expression for limiting tension ratio in case of flat belt drive.
07
Q.4

Differentiate between Involute and Cycloidal gear tooth profile. Explain law of
Gearing.
07

Explain epicyclic gear train with neat sketch.
07
Q.5

Derive an expression for the length of the arc of contact in a pair of meshed spur gears.
07

A cam drives a flat reciprocating follower: during first 120º rotations of the cam, follower moves outwards through a distance of 3 cm with SHM. The follower dwells during next 90º cam rotation. During next 90º cam rotation, the follower moves outwards with uniform acceleration and deceleration. Follower dwells for the remaining cam rotation. Draw cam profile.
07
Q.6

State and explain Kennedy's theorem.
07

With the help of neat sketches explain the types of cams and followers.
07
Q.7

Explain over hauling and self-locking of screw.
07

Explain uniform pressure theory in cone clutch with neat sketch.
07