Dr.A.P.J.Abdul Kalam University BE - ME III SEM Theory of Machines & Mechanism [ME-222T] Dec - 2020 Question Paper

Dr.A.P.J.Abdul Kalam University

Bachelor of Engineering

Third Semester Main Examination, Dec-2020

Theory of Machines & Mechanism [ME-222T]

Branch- ME

Time: 3:00 Hrs Max Marks 70

Note : (i) Attempt any five questions.

All question carry equal marks.

Q.1 (a) Write short notes on following:

(i) Creep in belt.

(ii) Gruebler’s and Kutzbach’s criterion.

(b) Find relations to determine velocity ratio and center distance of helical gears?

Q.2 (a) What are the requirements of high speed CAM?

(b) Discuss various types of CAMS.

Q.3 (a) Two parallel shafts, about 600 mm apart are to be connected by spur gears. One shaft is to run at

360 r.p.m. and the other at 120 r.p.m. Design the gears, if the circular pitch is to be 25 mm.

(b) What is Degree of Freedom?

Q.4 (a) Discuss stability of two and four wheel vehicles on the basis of gyroscope.

(b) Define gyroscopic couple. Explain gyroscopic effect on naval ships

Q.5 (a) Define: Base circle, Pitch circle, Trace point, Pitch curve and Pressure

angle.

(b) Derive relations for velocity acceleration for convex CAM with flate faced follower.

Q.6 (a) Explain the types of belts.

(b) Explain materials used for belts?

Q.7 (a) A crank and slotted mechanism used in shaper has a centre distance of 300 mm between the centre

of oscillation of the slotted lever and the centre of rotation of the crank. The radius of the crank is 120

mm. Find the ratio of the time of cutting to the time of return stroke.

(b) Find the power transmitted by a belt running over a pulley of 600 mm diameter at 200 r.p.m. The

coefficient of friction between the belt and the pulley is 0.25, angle of lap 160o and maximum tension

in the belt is 2500N.

Q.8 (a) Write and Explain Gruebler’s and Kutzbach criterion.

(b) Define Couple and Moment of Inertia?

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