Mechanical Engine Instructor: En. Jalal Salayma Date: 22/12/2016 Time: 25 min. Mechanical Vibration Final Exam Student Name: Student Number: Section:....... Notes: Write your name on each page. Closed Book: Q#1: (10 points) Indicate whether each of the following statements is true () or false (x): No. 1 2 3 4 5 6 Statement The frequency with which an initially disturbed system vibrates on its own is known as natural frequency. A harmonic motion is a periodic motion. The equation of motion of a single-degree-of-freedom system will be the same whether the mass moves in a horizontal plane or an inclined plane. The logarithmic decrement can be used to find the damping ratio. The response will be harmonic if excitation is harmonic. During beating, the amplitude of the response builds up and then diminishes in a regular pattern. Answer 7 The amplitude ratio attains its maximum value at resonance in the case of viscous damping. 8 X 9 10 The vibration of a system depends on the coordinate system. The principal coordinates avoid both static and dynamic coupling. The relative amplitudes of different degrees of freedom in a two-degree-of-freedom system depend on the natural frequency. Quality Assurance Unit Exam Template 2008 1/2