In a multi-rotor system of torsional vibration maximum number of nodes that can occur is

Rotating shafts tend of vibrate violently at whirling speeds because

A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotors separately, are 100 cycles/sec and 200 cycles/sec respectively. The lowest critical speed is

An automotive engine weighing 240 kg is supported on four springs with linear characteristics. Each of the front two springs have a stiffness of 16 MN/m while the stiffness of each rear spring is 32 MN/m. The engine speed (in rpm), at which resonance is likely to occur, is

A shaft of 50 mm diameter and 1 m length carries a disc which has mass eccentricity equal to 190 microns. The displacement of the shaft at a speed which is 90% of critical speed in microns is

The rotor of a turbine is generally rotated at

The critical speed of a rotating shaft depends upon

A slender shaft supported on two bearings at its ends carries a disc with an eccentricity e from the axis of rotation. The critical speed of the shaft is N. If the disc is replaced by a second one of same weight but mounted with an eccentricity 2e, critical speed of the shaft in the second case is

The above figure shows two rotors connected by an elastic shaft undergoing torsional vibration. The rotor (1) has a mass of 2 kg and a diameter of 60 cm, while the rotor (2) has a mass of 1 kg and a diameter of 20 cm. what is the distance L from rotor (2) at which the node of torsional vibration occurs?