Quiz on Mechanical Vibration (Harmonic Excitation)

1. At resonance condition, what is the shape of phasor diagram of a simple spring-mass-damper system (1 DOF) subjected to harmonic excitation?

2. At resonance condition, the inertial force of a vibrating body under harmonic excitation is resisted by

3. At resonance condition, the excitation force to a vibrating body (1 DOF) is resisted by

4. What is the value of phase angle $\phi \, $ of an undamped vibrating spring mass system?

5. An undamped spring-mass system subjected to harmonic excitation, at resonance condition, the excitation force is resisted by

6. From the phasor diagram of damped spring-mass system subjected to harmonic excitation, the perpendicularity between spring force and damping force represents

7. What is the physical significance of phasor diagram?

8. What is the shape of undamped spring-mass system subjected to harmonic excitation?

9. Spring force and damping force of a vibrating body subjected to harmonic excitation is always perpendicular to each other.

10. Spring force and inertia force of a vibrating body subjected to harmonic excitation are always opposite to each other.