Q3) Mark a circle on false or true for the correct answer. A- Referring to a single degree of freedom damped system with free vibration, vibration only occurs when >1. B-Considering the dimensionless factor (; ωπ folk -) versus Curve for damped forced system, the dimensionless factor decreases as the damping ratio increases. C- Referring to a single degree of freedom damped forced system, the resonance occurs at (0-1). Wn D- Referring to equation of motion for forced damped system, the damping coefficient "C" can be found from the ratio of x coefficient to x coefficient by knowing the system mass, damping ratio and its natural frequency. E-Referring to spring - mass system with forced damped vibration, the exciting force affecting the value of the natural frequency of the system. F- The simple spring-mass system vibrates freely without damping by any periodic motion. G-Referring to simple energy method, the sum of the K.E. and the P.E. for non- conservative system is equal constant at any interval of time. false true false true false true false true false true false true false true (25 mark)