Question

3. In a vibrating system, Damping limits the amplitude of vibration at resonance to a finite value There is no vibration if the exciting force vibrates at very high frequencies comparedto the natural frequency The system vibrates together with the exciting force at very low frequencies compared to the natural frequency All of the above are true. a. b. c. d. 4· The cheapest of composite matenals used in small craft hull construction is: a. b. c. d. Carbon fiber- epoxy resin matrix Kevlar fiber- epoxy resin matrix Glass fiber- polyester resin Glass fiber- polyethylene resin

Answer 1

31 (a) Dampina redu ces the ampitude of Vilbration at veonance it can be observed from the fowinTaph f Magnification facto t1 스↑ 2. (+)(迅) chec pest