1. Resonance is the case where The excitation frequency is greater than the natural frency The excitation frequency is l

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1 Resonance Is The Case Where The Excitation Frequency Is Greater Than The Natural Frency The Excitation Frequency Is L 1 (49.15 KiB) Viewed 23 times

1. Resonance is the case where The excitation frequency is greater than the natural frency The excitation frequency is less than the natural frequency The excitation frequency is the same as the natural frequency. d. The excitation frequency is the same as the force frequency b. 2. Damping is used in a vibratory system to: b. a. Reduce the level of vibration in the system. Control the vibration level to a specific value. Control the force transmitted to the foundation. All of the above. c. d. e. None of the above. 3. The damping ratio of a SDOFS can be determine experimentally using: a. The logarithmic decrement b. The dashpot constant c. The underdamping case d. The over-damping case 4. A SDOF system is the system who has: a. Multiple natural frequencies b. Single mass and multiple spring c. Single spring and multiple masses -d. One independent coordinate describing its motion 5. An elastic cantilever beam made of steel (E-210 GPa) and dimensions (1-7900 mm and L-2m) can be considered as a spring of stiffness k equals: a. 0.622 N/mm b. 9.9 N/mm c. 62.2x10³ kN/m d. 99000 N/m 6. The natural frequency of a simple pendulum of mass 20 kg and length 1-9.81 m is: a. 1.00 rad/s b. 0.50 rad/s c. 9.81 Hz d. 20 Hz 7. When two springs K₁ and K₂ connected in series the equivalent stiffness is: a. K=K₁+K₂ b. K=K,K₂/(K₁+K₂) c. K=(K₁+K₂)/3 d. None of the above