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APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Sixth semester B.Tech examinations (S), September 2020

Course Code: ME304
Course Name: DYNAMICS OF MACHINERY

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any three full questions, each carries 10 marks. Marks
1 Find the torque developed in crank AB of slider crank mechanism shown figure, (10)

when it is in static equilibrium. The crank radius is 50mm, connecting rod length
200mm and BE=100mm. The two external forces are acting parallel to the line of
stroke.

2 In a four-bar link mechanism with the following dimensions AB = 30cm, (10)
BC=30.5cem, AD=56, CD = 30cm. The link AB makes an angle 45° with the
horizontal. A horizontal force ‘P’(1500N) is acting on link CD at 10 cm from D. Find
the torque applied at link AB to keep the mechanism in static equilibrium.

3 A Single cylinder vertical engine has a bore of 40 cm and a stroke of 50 cm. The (10)
connecting rod is 120cm long. The mass of reciprocating parts is 150kg. On the
expansion stroke with the crank at 30° from the top dead centre the gas pressure is |
Mpa. If the engine runs at 300rpm, determine

a. Net force acting on the piston
b. Resultant load on the gudgeon pin
c. Thrust on the cylinder walls
.4 ച What is a dynamically equivalent system? Explain. (5)

b) With the help of a neat sketch explain different forces acting on a helical gear, when (5)
it transmits power.
PART ‏تا‎
‎Answer any three full questions, each carry 10 marks.
5 The equation of the turning moment curve of a three crank engine is (400 + 150 ओ (10)
30) Nm, where 0 is the crank angle in radians. The total fluctuation of speed is 1% of
the mean speed and the mean speed is 200rpm. If the resisting torque is constant, find

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