1. Explain the terms "system", "dynamical modelling", "simulation" and "automatic control". (20 points) 2. Explain the system and control strategy of ship cold room refrigeration system. (25 points) 3. Obtain the transfer function, block diagram and state-space representation of the model below: (30 points) 727 ?? -2+ 3 20+ 2? =6? ?t 4. The mathematical model of the spring-mass-damper system shown in the figure below is: M?+ b? + k? =F ?(0) = 0 : ?(0)=0 where M = 2 kg, b = 7 Ns/m, k = 10 N/m and F = 3 N. Obtain the response of the system and draw the time-displacement graphic of the response for Os s t s 5s. (25 points)