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ESE 2021 ME Technical Quiz || Vibrations
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Question 1
In a spring-mass system, the mass is 0.1 kg and the stiffness of the spring is 1 kN/m. By introducing a damper, the frequency of oscillation is found to be 90% of the original value. What is the damping coefficient of the damper?
Question 2
A vehicle suspension system consists of a spring and a damper. The stiffness of the spring is 3.6 kN/m and the damping constant of the damper is 400 Ns/m. If the mass is 50 kg, then the damping factor (D) and damped natural frequency (fn), respectively, are
Question 3
For a spring mass system with a dashpot, if a force of 49 N on the dashpot produces a velocity of 0.12 m/s, (mass =10 kg and spring constant =300 N/m) find the damping factor
Question 4
A machine part of mass 2 kg vibrates in viscous medium, angular frequency at resonance condition is found to be 10π rad/s. If a harmonic exciting force of 25 N produces 1.25 cm. Find the stiffness of the system (in N/m).
Question 5
A three rotor system has following number of natural frequencies __________.
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Jul 1ESE & GATE ME
