GTU 3151911 Dynamics of Machinery Summer 2025 Question Paper & PDF

Explain the role of flywheel in two wheelers. How its function is differing from governor?

Derive necessary formula for critical speed of rotating shaft carrying a single rotor for un-damped vibrations.

The mass of the turbine rotor of a ship is 3000 Kg and radius of gyration is 0.4 m, rotating at speed of 2500 rpm clockwise, when looking from stern. Determine gyroscopic couple and its effect when a) the ship steers to the left on curve of 100 m radius at a speed of 36 kmph. b) when the ship is pitching in SHM, the bow falling with its maximum velocity. The period of pitching is 40 seconds and the total angular displacement between the two extreme positions of pitching is 12°.

Mass of reciprocating parts = 100 Kg, mass of connecting rod = 80 Kg, Stroke length = 200 mm, length of connecting rod between centers = 400 mm, Radius of gyration of connecting rod about an axis through C. G. = 120 mm, Distance of C. G. from big end center = 160 mm, Engine speed = 900 rpm clockwise, Determine the inertia torque on crankshaft when crank has turned 40° from I. D. C.

Explain why the leading and trailing wheels of a high speed locomotives are connected with connecting rods.

Three masses are rotating in the different planes. How many balancing masses are required for balancing of these masses? Explain in brief procedure of balancing of these masses.

The following data refers to an inside cylinder locomotive; Mass of a rotating parts/ cylinder = 14 Kg, Mass of reciprocating parts/ cylinder = 39 Kg, Pitch of the cylinder = 700 mm, Angle between the cranks = 90°, Length of each crank = 320 mm, Wheel tread diameter = 1900 mm, Distance between planes of wheel = 1800 mm, If total rotating masses and 2/3 of the reciprocating masses are to be balanced, then determine the magnitude and angular position of balanced masses to be placed at a radius of 700 mm in the plane of wheels.

A shaft of 50 mm diameter and 3 m long is simply supported at the ends carries three rotors of mass 100 Kg, 150 Kg and 75 Kg at 2 m, 1 m and 0.5 m from the right hand support. The modulus of elasticity of the shaft material is 2x10⁵ N/mm². Find the critical speed of the shaft by using Dunkerley’s method.