Forced vibrations, resonance and damping Quiz
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5 questions, one answer each
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1. A system has a natural frequency of 8.0 Hz and is driven at 5.0 Hz. At what frequency does it vibrate in steady state?
- A. 8.0 Hz
- B. 3.0 Hz
- C. 13 Hz
- D. 5.0 Hz
2. Which statement about resonance is correct?
- A. The driving frequency equals the natural frequency and amplitude is a maximum
- B. The driving frequency is much higher than the natural frequency
- C. The amplitude is zero
- D. The damping is infinite
3. What happens to the resonance peak when damping is increased?
- A. It becomes taller and sharper
- B. It becomes lower and broader
- C. It moves to a much higher frequency
- D. It disappears and the amplitude becomes infinite
4. A tube closed at one end resonates with a fork of wavelength 0.80 m. What is the shortest resonant length?
- A. 0.20 m
- B. 0.40 m
- C. 0.80 m
- D. 0.60 m
5. Why do engineers fit dampers to a footbridge?
- A. To make the natural frequency equal to walking pace
- B. To increase the amplitude of the oscillations
- C. To dissipate energy and reduce the amplitude at resonance
- D. To make the bridge lighter