Theory of Machines Past Paper PDF (Sep 2020)
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2020
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Summary
This is a past paper for a Theory of Machines exam from September 2020. The paper covers various topics including quick return mechanisms, screws, belts, flywheels, governors, and vibratory motions. It includes several questions requiring calculations and explanations.
Full Transcript
S.B. Roll No………………………………………………. THEORY OF MACHINES 5th Exam/5349/Mech./Prod/Aero/Sep'2020 Duration: 1.15 Hrs. M.Marks:25...
S.B. Roll No………………………………………………. THEORY OF MACHINES 5th Exam/5349/Mech./Prod/Aero/Sep'2020 Duration: 1.15 Hrs. M.Marks:25 SECTION-A Q1. Attempt any three questions. 3x5=15 a. Explain Whitworth Quick return motion mechanism. b. Explain the concept of screw with nut. c. Define velocity ratio, slip and creep in belts. d. Write principle and application of flywheel. e. Define Hunting, Isochronisms and sensitiveness of a governor. f. Describe various types of vibratory motions. SECTION-B Q2. Attempt any one question. 1x10=10 i. Explain centrifugal tension in the bellt. Derive an expression Tc =mv2. ii. A Porter governer has equal arms of 200 mm long. Mass of each ball is 4 kg. A central load of 26 kg is acting on the sleeve. The radius of rotation of the ball is 145 mm when governer begins to lift and it has radius of rotation 190 mm at maximum speed of the governer. Find the maximum and minimum speeds and range of speed of governer. iii. Explain the concept of fluctuation of speed and fluctuation of energy in flywheel. m iv. With the help of neat sketches explain different types of bearings. Also write their applications. o.r c p e m a o r p.r c b p e p a b r
