Q.1
The frequency of damped vibrations with viscous damping is __________ the frequency of undamped vibrations.
  • more than
  • less than
  • same as
  • All of above
Q.2

A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, areHz andHz respectively. The lowest critical speed is

  • 5367 r.p.m.
  • 6000 r.p.m.
  • 9360 r.p.m.
  • 12000 r.p.m.
0 h : 0 m : 1 s