3. Number of control elements: a. 3 b. 4 c.5 d. 2 4. Final control element is used to, a. measure the variable b. control the variable c. manipulate the variable 5. Negative feedback control system is: a. similar to feedforward control system in action. b. containing a controller uses information fed forward from the load. c. containing a controller uses information feedback from measuring element. 6. Thermocouple is used to measure: a. flow b. Composition c. temperature d. level 7. Magnetic resonance analysis used to measure: a. Temperature b. Composition c. flow d. pressure 8. Head devices - bubble tube is used to measure, a. level b. Pressure c. temperature d. flow